RFC3814
Network Working Group T. Nadeau Request for Comments: 3814 Cisco Systems, Inc. Category: Standards Track C. Srinivasan
Bloomberg L.P.
A. Viswanathan
Force10 Networks, Inc.
June 2004
Multiprotocol Label Switching (MPLS) Forwarding Equivalence
Class To Next Hop Label Forwarding Entry (FEC-To-NHLFE)
Management Information Base (MIB)
Status of this Memo
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2004).
Abstract
This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes managed objects for defining, configuring, and monitoring Forwarding Equivalence Class (FEC) to Next Hop Label Forwarding Entry (NHLFE) mappings and corresponding actions for use with Multiprotocol Label Switching (MPLS).
5.1.1. Advantages of Address Ranges Over CIDR Prefixes. 4
7.2. Creating FTN Entries and Applying them to Interfaces . . 9
Contents
Introduction
This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes managed objects for specifying Forwarding Equivalence Class (FEC) to Next Hop Label Forwarding Entry (NHLFE) mappings and corresponding actions for Multiprotocol Label Switching (MPLS).
At the ingress of an MPLS network, packets entering the MPLS domain are assigned to an FEC. Those packets belonging to an FEC are associated with an NHLFE (i.e., MPLS label) via the FEC-to-NHLFE (FTN) mapping RFC3031. This relationship defines how ingress LSRs will impose MPLS labels onto incoming packets. It also defines how egress LSRs will decapsulate the MPLS shim header from MPLS packets.
Conceptually, some of the FTN table functionality could be implemented using the Forwarding Information Base (FIB) to map all packets destined for a prefix to an LSP. However, this mapping is coarse in nature.
Similar functionality is already being used in other contexts such as security filters, access filters, and RSVP flow identification. All of these require various combinations of matching based on IP header and upper-layer header information to identify packets for a particular treatment. When packets match a particular rule, a corresponding action is executed on those packets. For example, two popular actions to take when a successful match is identified are allowing the packet to be forwarded or to discard it. However, other
actions are possible, such as modifying the TOS byte, or redirecting a packet to a particular outgoing interface. In the context of MPLS, the possible actions performed by an NHLFE are to redirect packets to either an MPLS Label Switched Path (LSP) or an MPLS Traffic Engineered (TE) Tunnel.
This document attempts to consolidate the various matching requirements and associated action options needed for MPLS into a single specification.
Terminology
Although all of the terminology used in this document is either covered in the MPLS Architecture RFC3031 or in the SNMP Architecture RFC3411, it is informational to define some immediately pertinent acronyms/terminology here.
MPLS Multiprotocol Label Switching FEC Forwarding Equivalence Class NHLFE Next-Hop Label Forwarding Entry FTN FEC-to-NHLFE MIB Management Information Base
Conventions Used In This Document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, RFC 2119 RFC2119.
The Internet-Standard Management Framework
For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 RFC3410.
Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 RFC2578, STD 58, RFC 2579 RFC2579 and STD 58, RFC 2580 RFC2580.
Outline
This MIB module resides on any LSR which does the FEC-to-NHLFE mapping in order to map traffic into the MPLS domain. This MIB module consists of three tables:
- mplsFTNTable defines the rule base against which incoming packets
are matched and defines the actions to be taken on matching packets;
- mplsFTNMapTable defines the application of these rules to specific
interfaces;
- mplsFTNPerfTable provides performance counters for every entry in
mplsFTNTable that is active on one or more interfaces, on a per- interface basis.
mplsFTNTable
This table allows FEC to NHLFE mappings to be specified. Each entry in this table (also referred to as an "FTN entry" in this document) defines a rule to be applied to incoming packets (on interfaces that the entry is activated on using mplsFTNMapTable as explained in Section 5.2) and an action to be taken on matching packets. mplsFTNTable allows 6-tuple matching rules based on one or more of source address range, destination address range, source port range, destination port range, IPv4 Protocol field RFC791 or IPv6 next- header field RFC2460, and the DiffServ Code Point (DSCP, RFC2474) to be specified. Packet redirection is based on an action pointer which points either at an mplsXCEntry in MPLS-LSR-STD-MIB RFC3813 when the NHLFE is a non-TE LSP, or at an mplsTunnelEntry in MPLS-TE- STD-MIB RFC3812 when the NHLFE is the origin of a TE tunnel.
Advantages of Address Ranges Over CIDR Prefixes
One possible way of specifying a set of addresses as part of an FTN rule is to use CIDR prefixes RFC1519. We have instead chosen to allow FTN rules to be expressed in terms of address ranges in mplsFTNTable because they have the following advantages.
- The number of CIDR prefixes needed to represent some address
ranges is very large. For example, we need the following 6 CIDR prefixes to represent the range of addresses [192.0.2.0- 192.0.2.62]: 192.0.2.0/27, 192.0.2.32/28, 192.0.2.48/29, 192.0.2.56/30, 192.0.2.60/31, and 192.0.2.62/32. A rule such as "redirect all packets with a source address in the range [192.0.2.0-192.0.2.62] and destination address in the range [192.0.2.128-192.0.2.190] to tunnel #2" would require the creation
of 36 conceptual rows in mplsFTNTable if the rules were expressed as CIDR prefixes, but only a single conceptual row would be required if we used address ranges instead.
- Every CIDR prefix can be expressed as a single equivalent address
range.
- A particular implementation is free to translate the address
ranges specified in mplsFTNTable internally to equivalent CIDR prefixes, if it so chooses. However, given that powerful range matching algorithms are available, many implementations may prefer to implement these directly.
mplsFTNMapTable
This table provides the capability to activate or map FTN entries defined in mplsFTNTable to specific interfaces in the system. Packets received on an interface are compared against FTN entries in the order in which entries are applied to the interface.
Indexing Requirements
The indexing structure of mplsFTNMapTable was designed to satisfy the following requirements.
- We must be able to insert a new entry into an existing list of
entries on an interface with a single SET operation. Thus, we must be able to support an insertion operation that does not require manual reindexing of existing entries.
- A management application must be able to traverse entries that
have been applied to a particular interface in the order of application. The number of (non-bulk) retrieval operations to obtain this information as dictated by the particular indexing scheme that we choose for mplsFTNMapTable must be no more than that dictated by any other indexing scheme. For example, the indexing scheme must not force the Network Management Application to retrieve all the entries in the table and sift through them offline to obtain this information.
How the Current Indexing Works
The natural data-structure for implementing constant time insertions between two existing entries and for supporting in-order traversals is a linked-list.
The chosen indexing structure of mplsFTNMapTable makes the entries in the table behave like items in a linked-list. Each conceptual row
has an object, mplsFTNMapPrevIndex, which is a pointer to the previous entry that is applied to a particular interface. This object is self-adjusting, i.e., its value is automatically adjusted by the agent, if necessary, after an insertion or deletion operation.
This indexing scheme provides a mechanism to 'insert' an FTN entry between two existing entries already applied on an interface. This is done by specifying the entry after which a new entry should be inserted in mplsFTNMapPrevIndex.
Using this linked-list structure, one can retrieve FTN entries in the order of application on a per-interface basis as follows:
- To determine the first FTN entry on an interface with index
ifIndex, perform a GETNEXT retrieval operation on mplsFTNMapRowStatus.ifIndex.0.0; the returned object, if one exists, is (say) mplsFTNMapRowStatus.ifIndex.0.n (mplsFTNMapRowStatus is the first accessible columnar object in the conceptual row). Then, the index of the first FTN entry applied on this interface is n.
- To determine the FTN entry applied to an interface after the one
indexed by n, perform a GETNEXT retrieval operation on mplsFTNMapRowStatus.ifIndex.n.0. If such an entry exists, the returned object would be of the form mplsFTNMapRowStatus.ifIndex.n.m. Then, the index of the next FTN entry applied on this interface is m.
- If the FTN entry indexed by n is the last entry applied to the
interface with index ifIndex, then the object returned would either be:
1. mplsFTNMapRowStatus.ifIndexNext.0.k, where ifIndexNext is the
index of the next interface in ifTable to which an FTN entry
has been applied, in which case k is the index of the first FTN
entry applied to the interface with index ifIndexNext;
or:
2. mplsFTNMapStorageType.firstIfIndex.0.p, if there are no more
entries in mplsFTNMapTable, where firstIfIndex is the first
entry in ifTable to which an FTN entry has been mapped.
The above steps can be used to retrieve all the applied entries on a per-interface basis in application order. Note that the number of retrieval operations is equal to the number of applied FTN entries (i.e., the minimum number of GETNEXT operations needed using any indexing scheme).
Also note that we could not have created this linked-list structure using a 'next' pointer object instead of the 'previous' pointer object that we chose because this would not allow us to determine the first FTN entry that has been mapped to a specific interface using a single SNMP (non-bulk) retrieval operation.
The use of this indexing structure is further illustrated using an example in Section 7.
mplsFTNPerfTable
If an FTN entry has been applied to one or more interfaces, this table provides high-capacity performance counters to monitor each such FTN entry on a per-interface basis.
Avoiding Retrieval-Modification Interactions
The problem of an ongoing traversal or retrieval operation on an SNMP table being affected by a concurrent modification operation on that table is not unique to this MIB module. However, it is useful to note that a cautious application can keep track of the state of the modifiable tables in this MIB module using the objects mplsFTNTableLastChanged and mplsFTNMapTableLastChanged.
For instance, before performing a traversal of mplsFTNMapTable, the application should retrieve the value of mplsFTNMapTableLastChanged. Each subsequent GETNEXT operation on the table should include this object as well. For example, GETNEXT(mplsFTNMapTableLastChanged.0, mplsFTNMapRowStatus.ifIndex.n.0) can be used to:
- Determine the FTN entry after the one indexed by n (in linked-list
order) mapped to the interface with index ifIndex, as explained in Section 5.2.2;
- Verify that the value of mplsFTNMapTable has not been modified
during the retrieval process by comparing the value of mplsFTNMapTableLastChanged retrieved by this operation with the value retrieved before the traversal was begun.
Using this technique, an application can ensure the validity of the retrieved information with minimal overhead. This is particularly important while retrieving information from frequently modified tables.
Example Illustrating MIB Module Components
In this section, we use an example to illustrate how the objects defined in MPLS-FTN-STD-MIB work together to perform FEC to NHLFE mapping.
Note that for the various table entries involved in this example, we only show the objects that help illustrate each case.
Sample FTN Rules
Suppose that we wish to activate the following two FTN rules.
Rule #1: On interface ifIndex = 1, redirect packets with source IPv4 address matching 192.0.2.63 to an LSP with outgoing ifIndex = 50 and outgoing label = 150 where the specified LSP is represented by the following entries in mplsXCTable and mplsOutSegmentTable.
In mplsXCTable:
{
mplsXCIndex = 0x02,
mplsXCInSegmentIndex = 0x00,
mplsXCOutSegmentIndex = 0x03,
mplsXCLabelStackIndex = 0
}
The value 0x00 for mplsXCInSegmentIndex represents an originating LSP RFC3813.
In mplsOutSegmentTable:
{
mplsOutSegmentIndex = 0x03,
mplsOutSegmentIfIndex = 50,
mplsOutSegmentPushTopLabel = true,
mplsOutSegmentTopLabel = 150
}
Rule #2: On interface ifIndex = 1, redirect packets with destination IPv4 addresses in the range [192.0.2.32, 192.0.2.96] to tunnel #4, where the specified tunnel is represented by the following entry in mplsTunnelTable:
{
mplsTunnelIndex = 4,
-- primary tunnel
mplsTunnelInstance = 0,
mplsTunnelIngressLSRID = 192.0.2.1,
mplsTunnelEgressLSRID = 192.0.2.2
}
Creating FTN Entries and Applying them to Interfaces
The action "redirect packets with source IPv4 address matching 192.0.2.63 to an LSP with outgoing ifIndex = 50 and outgoing label = 150" in Rule #1 can be implemented by the following entry in mplsFTNTable:
{
mplsFTNIndex = 1,
mplsFTNDescr = "Rule #1",
-- source address only
mplsFTNMask = 0x80,
mplsFTNAddrType = ipv4,
mplsFTNSourceAddrMin = 192.0.2.63,
mplsFTNSourceAddrMax = 192.0.2.63,
mplsFTNActionType = redirectLsp(1),
mplsFTNActionPointer = mplsXCLspId.1.2.1.0.1.3
}
This indicates to which LSP the LSR should redirect packets by setting mplsFTNActionPointer to the first accessible columnar object instance in mplsXCEntry that corresponds of the LSP to use, in this case mplsXCLspId.1.2.1.0.1.3.
This action is then activated on "interface ifIndex = 1" by the following entry in mplsFTNMapTable to complete the implementation of Rule #1:
{
-- apply rule to interface ifIndex = 1
mplsFTNMapIndex = 1,
-- first FTN entry on this interface
mplsFTNPrevIndex = 0,
-- index of current entry in mplsFTNTable, i.e., Rule #1
mplsFTNMapCurrIndex = 1
}
The action "redirect packets with destination IPv4 addresses in the range [192.0.2.32, 192.0.2.96] to tunnel #4" in Rule #2 can be implemented by the following entry in mplsFTNTable:
{
mplsFTNIndex = 2,
mplsFTNDescr = "Rule #2",
-- destination address only
mplsFTNMask = 0x40,
mplsFTNAddrType = ipv4,
mplsFTNDestAddrMin = 192.0.2.32,
mplsFTNDestAddrMax = 192.0.2.96,
mplsFTNActionType = redirectTunnel(2),
mplsFTNActionPointer = mplsTunnelName.4.0.3221225985.3221225986
}
where 3221225985 and 3221225986 are representations of the addresses 192.0.2.1 and 192.0.2.2, respectively, as Unsigned32 (the underlying data type) entities.
This rule needs to be activated on "interface ifIndex = 1" after Rule
- 1 which was previously activated on this interface. This is done by
the following entry in mplsFTNMapTable to complete the implementation of Rule #2:
{
-- apply rule to interface ifIndex = 1
mplsFTNMapIndex = 1,
-- insert after Rule #1 (mplsFTNIndex = 1)
mplsFTNPrevIndex = 1,
-- index of current entry in mplsFTNTable, i.e., Rule #2
mplsFTNMapCurrIndex = 2
}
Mapping an FTN Entry to Multiple Interfaces
Suppose we now wish to activate the following rule:
Rule #2b: On interface ifIndex = 2, redirect packets with destination IPv4 addresses in the range [192.0.2.32, 192.0.2.96] to tunnel #4.
Notice that the FEC and corresponding action associated with this rule (i.e., "redirect packets with destination IPv4 addresses in the range [192.0.2.32, 192.0.2.96] to tunnel #4") are the same as that associated with Rule #2. Hence, we can reuse the existing entry with mplsFTNIndex = 2 from mplsFTNTable.
However, we have to create the following new entry in mplsFTNMapTable to activate this FTN entry as the first one on the interface with ifIndex = 2.
{
-- apply rule to interface ifIndex = 2 mplsFTNMapIndex = 2, -- first FTN entry on this interface mplsFTNPrevIndex = 0, -- index of current entry in mplsFTNTable mplsFTNMapCurrIndex = 2
}
Inserting an Entry Into Existing List
At a later point, suppose that we wish to introduce the following Rule between Rules #1 and #2.
Rule #3: On interface ifIndex = 1, redirect all packets with destination IPv4 address matching the prefix 192.0.2.32/28 to tunnel #3, where the tunnel we wish to redirect traffic to is represented by the following entry in mplsTunnelTable:
{
mplsTunnelIndex = 3,
-- primary tunnel
mplsTunnelInstance = 0,
mplsTunnelIngressLSRID = 192.0.2.3,
mplsTunnelEgressLSRID = 192.0.2.4
}
Note that the ordering of the rules on a particular interface is critical since the range of addresses specified in Rule #3 is a subset of the ones specified in Rule #2.
Without the linked-list style insertion feature supported by mplsFTNMapTable, we would possibly have had to reindex existing entries (or plan for such changes by leaving sufficient gaps between indexes, something that only postpones the problem). With the existing tables, we solve this problem by creating the following entries.
We implement the phrase "redirect all packets with destination IPv4 address matching the prefix 1.4.0.0/16 to tunnel #3" in Rule #3 by creating the following entry in mplsFTNTable:
{
mplsFTNIndex = 3,
mplsFTNDescr = "Rule #3",
-- destination address only
mplsFTNMask = 0x40,
mplsFTNAddrType = ipv4,
-- address range equivalent to CIDR prefix 192.0.2.32/28
mplsFTNDestAddrMin = 192.0.2.32,
mplsFTNDestAddrMax = 192.0.2.47,
mplsFTNActionType = redirectTunnel,
mplsFTNActionPointer = mplsTunnelName.3.0.3221225987.3221225988
}
where 3221225987 and 3221225988 are representations of the addresses 192.0.2.3 and 192.0.2.4, respectively, as Unsigned32 (the underlying data type) entities.
We next insert this rule in mplsFTNMapTable just after Rule #1 as follows:
{
-- apply rule to interface ifIndex = 1
mplsFTNMapIndex = 1,
-- insert after Rule #1 (mplsFTNIndex = 1)
mplsFTNPrevIndex = 1,
-- index of current entry in mplsFTNTable i.e., Rule #3
mplsFTNMapCurrIndex = 3
}
After the insertion of Rule #3 in mplsFTNMapTable, the 'previous' pointer object mplsFTNMapPrevIndex of the next entry (corresponding to Rule #2) adjusts automatically to point to this entry.
Note that, of the existing entries in the table, the only one that is impacted by an insertion operation is the entry on that particular interface immediately after the newly inserted one, if one exists. None of the other entries in mplsFTNMapTable are impacted. For instance, in this particular example, when the entry for Rule #3 was inserted between those for Rules #1 and #2, the entries for Rules #1 and #2b were not impacted.
Pictorial Tabular Relationship
At this point, the relationship between different table entries can be represented pictorially as follows. For each conceptual row instance, we show the table that it belongs to, along with its indices in parentheses. (Note that various conceptual rows are depicted in a way that is convenient for showing the interrelationships and are not necessarily in lexicographical order.)
ifTable, The Interfaces Group MIB RFC2863: +-> ifEntry (1) | (ifIndex = 1) | | mplsFTNMapTable: | mplsFTNMapEntry (1.0.1): <--------------------+ +<-- (mplsFTNMapIndex = 1, | | mplsFTNMapPrevIndex = 0, ---> (NULL) | | mplsFTNMapCurrIndex = 1) ------------+ | | | | | mplsFTNMapEntry (1.1.3): <------------------+ | +<-- (mplsFTNMapIndex = 1, | | | | mplsFTNMapPrevIndex = 1, ----------->+ | | | mplsFTNMapCurrIndex = 3) ---------+ | | | | | | | | | mplsFTNMapEntry (1.3.2): <----------------+ | | +<-- (mplsFTNMapIndex = 1, | | | | | mplsFTNMapPrevIndex = 3, -------->+ | | | | mplsFTNMapCurrIndex = 2) ----+ | | | | | | | | | | | mplsFTNTable: | | | | | | mplsFTNEntry (2): | | | | | | +--> (mplsFTNIndex = 2) <----------+ | | | | | | | | | | | | mplsFTNEntry (3): | | | | | | (mplsFTNIndex = 3) <---------------+ | | | | | | | | | | mplsFTNEntry (1): | | | | | (mplsFTNIndex = 1) <------------------+ | | | | | | | | mplsFTNPerfTable: | | | | mplsFTNPerfEntry (1.2): | | | | (mplsFTNPerfIndex = 1, | | | | mplsFTNPerfCurrIndex = 2) --------------+ | | | | | | mplsFTNPerfEntry (1.3): | | | (mplsFTNPerfIndex = 1, | | | mplsFTNPerfCurrIndex = 3) ---------------+ | | |
| mplsFTNPerfEntry (1.1): |
| (mplsFTNPerfIndex = 1, |
| mplsFTNPerfCurrIndex = 1) ------------------+
|
| mplsFTNPerfEntry (2.2):
| (mplsFTNPerfIndex = 2,
| mplsFTNPerfCurrIndex = 2) ------------------+
| |
| ifTable, The Interfaces Group MIB RFC2863: |
+---> ifEntry (2): |
| | (ifIndex = 2) |
| | |
| | mplsFTNMapEntry (2.1.2): <--------------------+
+----- (mplsFTNMapIndex = 2
| mplsFTNMapPrevIndex = 0 ---> (NULL)
+---- mplsFTNMapCurrIndex = 2)
Deleting an Entry
Let us next look at how we can remove the recently applied Rule #3 and how the existing conceptual rows behave in this situation.
The conceptual row corresponding to the application of Rule #3 to interface ifIndex = 1 has the following index values: mplsFTNMapIndex = 1, mplsFTNMapPrevIndex = 1, and mplsFTNMapCurrIndex = 3. To delete this conceptual row, the Network Management Application performs a SET operation setting the object instance mplsFTNMapRowStatus.1.1.3 to the value destroy(6). The agent then destroys this conceptual row. It also automatically adjusts the object instance of mplsFTNMapPrevIndex corresponding to Rule #2 from the value 3 (i.e., pointing to the recently destroyed Rule #3) to the value 1 (i.e., to Rule #1).
At this point, the rules applied to interface ifIndex = 1 are Rule #1 and Rule #2, in that order. The relationship between different table entries can be represented pictorially as follows.
ifTable, The Interfaces Group MIB RFC2863: +-> ifEntry (1) | (ifIndex = 1) | | mplsFTNMapTable: | mplsFTNMapEntry (1.0.1): <--------------------+ +<-- (mplsFTNMapIndex = 1, | | mplsFTNMapPrevIndex = 0, ---> (NULL) | | mplsFTNMapCurrIndex = 1) ------------+ | | | | | mplsFTNMapEntry (1.1.2): <----------------+ | +<-- (mplsFTNMapIndex = 1, | | | mplsFTNMapPrevIndex = 1, ------------+ | | mplsFTNMapCurrIndex = 2) ----+ | | | | | | | mplsFTNTable: | | | | mplsFTNEntry (2): | | | | +--> (mplsFTNIndex = 2) <----------+ | | | | | | | | mplsFTNEntry (3): | | | | (mplsFTNIndex = 3) | | | | | | | | mplsFTNEntry (1): | | | | (mplsFTNIndex = 1) <------------------+ | | | | | | mplsFTNPerfTable: | | | mplsFTNPerfEntry (1.2): | | | (mplsFTNPerfIndex = 1, | | | mplsFTNPerfCurrIndex = 2) --------------+ | | | | mplsFTNPerfEntry (1.1): | | (mplsFTNPerfIndex = 1, | | mplsFTNPerfCurrIndex = 1) ------------------+ | | mplsFTNPerfEntry (2.2): | (mplsFTNPerfIndex = 2, | mplsFTNPerfCurrIndex = 2) ------------------+ | | | ifTable, The Interfaces Group MIB RFC2863: | +---> ifEntry (2): | | | (ifIndex = 2) | | | | | | mplsFTNMapEntry (2.1.2): <--------------------+ +----- (mplsFTNMapIndex = 2 | mplsFTNMapPrevIndex = 0 ---> (NULL) +---- mplsFTNMapCurrIndex = 2)
Note that the FTN entry for Rule #3 still exists in mplsFTNTable at this point but is not referenced by any conceptual row in mplsFTNMapTable or mplsFTNPerfTable.
Also note that the deletion of an entry from mplsFTNMapTable only impacts the entry on that particular interface immediately after the deleted entry, if one exists. None of the other conceptual rows in mplsFTNMapTable are impacted. For instance, in this particular example, when the entry for Rule #3 was deleted, the entries for Rules #1 and #2b were not impacted.
The Use of RowPointer
RowPointer is a textual convention used to identify a conceptual row in a conceptual table in a MIB by pointing to the first accessible object. In this MIB module, in mplsFTNTable, the RowPointer object mplsFTNActionPointer indicates the LSP or TE Tunnel to redirect packets matching an FTN entry to. This object MUST point to the first instance of the first accessible columnar object in the appropriate conceptual row in order to allow the manager to find the appropriate corresponding entry in either MPLS-LSR-STD-MIB RFC3813 or MPLS-TE-STD-MIB RFC3812. If this object returns zeroDotZerok, it implies that there is no currently defined action that is associated with that particular FTN entry.
MPLS-FTN-STD-MIB Definitions
MPLS-FTN-STD-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Unsigned32, Counter64, Integer32
FROM SNMPv2-SMI -- RFC2578
RowStatus, StorageType, RowPointer,
TEXTUAL-CONVENTION, TimeStamp
FROM SNMPv2-TC -- RFC2579
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF -- RFC2580
InterfaceIndexOrZero,
ifGeneralInformationGroup, ifCounterDiscontinuityGroup
FROM IF-MIB -- RFC2863
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB -- RFC3411
Dscp
FROM DIFFSERV-DSCP-TC -- RFC3289
InetAddressType, InetAddress, InetPortNumber
FROM INET-ADDRESS-MIB -- RFC3291
mplsStdMIB
FROM MPLS-TC-STD-MIB -- RFC3811
;
mplsFTNStdMIB MODULE-IDENTITY
LAST-UPDATED "200406030000Z" -- June 6, 2004
ORGANIZATION "Multiprotocol Label Switching (MPLS) Working Group"
CONTACT-INFO
"
Thomas D. Nadeau
Postal: Cisco Systems, Inc.
250 Apollo Drive
Chelmsford, MA 01824
Tel: +1-978-244-3051
Email: [email protected]
Cheenu Srinivasan
Postal: Bloomberg L.P.
499 Park Avenue
New York, NY 10022
Tel: +1-212-893-3682
Email: [email protected]
Arun Viswanathan
Postal: Force10 Networks, Inc.
1440 McCarthy Blvd
Milpitas, CA 95035
Tel: +1-408-571-3516
Email: [email protected]
IETF MPLS Working Group email: [email protected]"
DESCRIPTION
"Copyright (C) The Internet Society (2004). The
initial version of this MIB module was published
in RFC 3814. For full legal notices see the RFC
itself or see:
http://www.ietf.org/copyrights/ianamib.html
This MIB module contains managed object definitions for
specifying FEC to NHLFE (FTN) mappings and corresponding
performance for MPLS."
-- Revision history.
REVISION
"200406030000Z" -- June 3, 2004
DESCRIPTION
"Initial version issued as part of RFC 3814."
::= { mplsStdMIB 8 }
-- TEXTUAL-CONVENTIONs used in this MIB. MplsFTNEntryIndex ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"Index for an entry in mplsFTNTable."
SYNTAX Unsigned32 (1..4294967295)
MplsFTNEntryIndexOrZero ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"Index for an entry in mplsFTNTable or the special value
zero. The value zero is object-specific and must
therefore be defined as part of the description of any
object which uses this syntax. Examples of the usage
of zero might include situations when none or all
entries in mplsFTNTable need to be referenced."
SYNTAX Unsigned32 (0..4294967295)
-- Top-Level Components of this MIB.
mplsFTNNotifications OBJECT IDENTIFIER ::= { mplsFTNStdMIB 0 } mplsFTNObjects OBJECT IDENTIFIER ::= { mplsFTNStdMIB 1 } mplsFTNConformance OBJECT IDENTIFIER ::= { mplsFTNStdMIB 2 }
-- Next free index in mplsFTNTable. mplsFTNIndexNext OBJECT-TYPE
SYNTAX MplsFTNEntryIndexOrZero
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the next available valid value to
be used for mplsFTNIndex when creating entries in the
mplsFTNTable.
When creating a new conceptual row (configuration
entry) in mplsFTNTable with an SNMP SET operation the
command generator (Network Management Application) must
first issue a management protocol retrieval operation
to obtain the current value of this object.
If the command responder (agent) does not wish to allow
creation of more entries in mplsFTNTable, possibly
because of resource exhaustion, this object MUST return
a value of 0.
If a non-zero value is returned the Network Management
Application must determine whether the value is indeed
still unused since two Network Management Applications
may attempt to create a row simultaneously and use the
same value.
If it is currently unused and the SET succeeds, the
agent MUST change the value of this object to a
currently unused non-zero value (according to an
implementation specific algorithm) or zero (if no
further row creation will be permitted).
If the value is in use, however, the SET fails and the
Network Management Application must then reread this
object to obtain a new usable value."
::= { mplsFTNObjects 1 }
-- Last time an object in mplsFTNTable changed. mplsFTNTableLastChanged OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Indicates the last time an entry was added, deleted or
modified in mplsFTNTable. Management stations should
consult this object to determine if mplsFTNTable
requires their attention. This object is particularly
useful for applications performing a retrieval on
mplsFTNTable to ensure that the table is not modified
during the retrieval operation."
::= { mplsFTNObjects 2 }
-- Table of FTN entries. mplsFTNTable OBJECT-TYPE
SYNTAX SEQUENCE OF MplsFTNEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains the currently defined FTN entries.
This table allows FEC to NHLFE mappings to be
specified. Each entry in this table defines a rule to
be applied to incoming packets (on interfaces that the
FTN entry is activated on using mplsFTNMapTable) and an
action to be taken on matching packets
(mplsFTNActionPointer).
This table supports 6-tuple matching rules based on one
or more of source address range, destination address
range, source port range, destination port range, IPv4
Protocol field or IPv6 next-header field and the
DiffServ Code Point (DSCP) to be specified.
The action pointer points either to instance of
mplsXCEntry in MPLS-LSR-STD-MIB when the NHLFE is a non-
TE LSP, or to an instance of mplsTunnelEntry in the
MPLS-TE-STD-MIB when the NHLFE is an originating TE
tunnel."
REFERENCE
"J. Postel, Internet Protocol, RFC 791, STD 5, September
1981
Deering, S., and R. Hinden, Internet Protocol, Version
6 (IPv6) Specification, RFC 2460, December 1998
Nichols, K, Blake, S., Baker, F. and D. Black,
Definition of the Differentiated Services Field (DS
Field) in the IPv4 and IPv6 Headers, RFC 2474, December
1998
Srinivasan, C., A. Viswanathan, and T. Nadeau, MPLS
Label Switch Router Management Information Base,
RFC 3813
Srinivasan, C., A. Viswanathan, and T. Nadeau, MPLS
Traffic Engineering Management Information Base,
RFC 3812"
::= { mplsFTNObjects 3 }
mplsFTNEntry OBJECT-TYPE
SYNTAX MplsFTNEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Each entry represents one FTN entry which defines a
rule to compare incoming packets with and an action to
be taken on matching packets."
INDEX { mplsFTNIndex }
::= { mplsFTNTable 1 }
MplsFTNEntry ::= SEQUENCE {
mplsFTNIndex MplsFTNEntryIndex,
mplsFTNRowStatus RowStatus,
mplsFTNDescr SnmpAdminString,
mplsFTNMask BITS,
mplsFTNAddrType InetAddressType,
mplsFTNSourceAddrMin InetAddress,
mplsFTNSourceAddrMax InetAddress,
mplsFTNDestAddrMin InetAddress,
mplsFTNDestAddrMax InetAddress,
mplsFTNSourcePortMin InetPortNumber,
mplsFTNSourcePortMax InetPortNumber,
mplsFTNDestPortMin InetPortNumber,
mplsFTNDestPortMax InetPortNumber,
mplsFTNProtocol Integer32,
mplsFTNDscp Dscp,
mplsFTNActionType INTEGER,
mplsFTNActionPointer RowPointer,
mplsFTNStorageType StorageType
}
mplsFTNIndex OBJECT-TYPE
SYNTAX MplsFTNEntryIndex
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This is the unique index for a conceptual row in
mplsFTNTable.
To create a new conceptual row in mplsFTNTable a
Network Management Application SHOULD retrieve the
current value of mplsFTNIndexNext to determine the next
valid available value of mplsFTNIndex."
::= { mplsFTNEntry 1 }
mplsFTNRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Used for controlling the creation and deletion of this
row. All writeable objects in this row may be modified
at any time. If a Network Management Application
attempts to delete a conceptual row by setting this
object to 'destroy' and there are one or more entries
in mplsFTNMapTable pointing to the row (i.e., when
mplsFTNIndex of the conceptual row being deleted is
equal to mplsFTNMapCurrIndex for one or more entries in
mplsFTNMapTable), the agent MUST also destroy the
corresponding entries in mplsFTNMapTable."
::= { mplsFTNEntry 2 }
mplsFTNDescr OBJECT-TYPE
SYNTAX SnmpAdminString MAX-ACCESS read-create STATUS current
DESCRIPTION
"The description of this FTN entry. Since the index for
this table has no particular significance or meaning,
this object should contain some meaningful text that an
operator could use to further distinguish entries in
this table."
::= { mplsFTNEntry 3 }
mplsFTNMask OBJECT-TYPE
SYNTAX BITS {
sourceAddr(0),
destAddr(1),
sourcePort(2),
destPort(3),
protocol(4),
dscp(5)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This bit map indicates which of the fields described
next, namely source address range, destination address
range, source port range, destination port range, IPv4
Protocol field or IPv6 next-header field and
Differentiated Services Code Point (DSCP) is active for
this FTN entry. If a particular bit is set to zero then
the corresponding field in the packet MUST be ignored
for comparison purposes."
::= { mplsFTNEntry 4 }
mplsFTNAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object determines the type of address contained in
the source and destination address objects
(mplsFTNSourceAddrMin, mplsFTNSourceAddrMax,
mplsFTNDestAddrMin and mplsFTNDestAddrMax) of a
conceptual row.
This object MUST NOT be set to unknown(0) when
mplsFTNMask has bit positions sourceAddr(0) or
destAddr(1) set to one.
When both these bit positions of mplsFTNMask are set to
zero the value of mplsFTNAddrType SHOULD be set to
unknown(0) and the corresponding source and destination
address objects SHOULD be set to zero-length strings."
::= { mplsFTNEntry 5 }
mplsFTNSourceAddrMin OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The lower end of the source address range. The type of
this object is determined by the corresponding
mplsFTNAddrType object."
::= { mplsFTNEntry 6 }
mplsFTNSourceAddrMax OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The upper end of the source address range. The type of
this object is determined by the corresponding
mplsFTNAddrType object."
::= { mplsFTNEntry 7 }
mplsFTNDestAddrMin OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The lower end of the destination address range. The
type of this object is determined by the corresponding
mplsFTNAddrType object."
::= { mplsFTNEntry 8 }
mplsFTNDestAddrMax OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The higher end of the destination address range. The
type of this object is determined by the corresponding
mplsFTNAddrType object."
::= { mplsFTNEntry 9 }
mplsFTNSourcePortMin OBJECT-TYPE
SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION
"The lower end of the source port range."
DEFVAL { 0 }
::= { mplsFTNEntry 10 }
mplsFTNSourcePortMax OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The higher end of the source port range "
DEFVAL { 65535 }
::= { mplsFTNEntry 11 }
mplsFTNDestPortMin OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The lower end of the destination port range."
DEFVAL { 0 }
::= { mplsFTNEntry 12 }
mplsFTNDestPortMax OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The higher end of the destination port range."
DEFVAL { 65535 }
::= { mplsFTNEntry 13 }
mplsFTNProtocol OBJECT-TYPE
SYNTAX Integer32 (0..255)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The IP protocol to match against the IPv4 protocol
number or IPv6 Next-Header number in the packet. A
value of 255 means match all. Note that the protocol
number of 255 is reserved by IANA, and Next-Header
number of 0 is used in IPv6."
DEFVAL { 255 }
::= { mplsFTNEntry 14 }
mplsFTNDscp OBJECT-TYPE
SYNTAX Dscp MAX-ACCESS read-create STATUS current
DESCRIPTION
"The contents of the DSCP field."
REFERENCE
"Nichols, K., Blake, S., Baker, F. and D. Black,
Definition of the Differentiated Services Field (DS
Field) in the IPv4 and IPv6 Headers, RFC 2474, December
1998."
::= { mplsFTNEntry 15 }
mplsFTNActionType OBJECT-TYPE
SYNTAX INTEGER {
redirectLsp(1), -- redirect into LSP
redirectTunnel(2) -- redirect into tunnel
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The type of action to be taken on packets matching this
FTN entry."
::= { mplsFTNEntry 16 }
mplsFTNActionPointer OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If mplsFTNActionType is redirectLsp(1), then this
object MUST contain zeroDotZero or point to a instance
of mplsXCEntry indicating the LSP to redirect matching
packets to.
If mplsFTNActionType is redirectTunnel(2), then this
object MUST contain zeroDotZero or point to a instance
of mplsTunnelEntry indicating the MPLS TE tunnel to
redirect matching packets to.
If this object points to a conceptual row instance in a
table consistent with mplsFTNActionType but this
instance does not currently exist then no action will
be taken on packets matching such an FTN entry till
this instance comes into existence.
If this object contains zeroDotZero then no action will
be taken on packets matching such an FTN entry till it
is populated with a valid pointer consistent with the
value of mplsFTNActionType as explained above."
::= { mplsFTNEntry 17 }
mplsFTNStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The storage type for this FTN entry. Conceptual rows
having the value 'permanent' need not allow write-
access to any columnar objects in the row."
DEFVAL { nonVolatile }
::= { mplsFTNEntry 18 }
-- End of mplsFTNTable.
-- Last time an object in mplsFTNMapTable changed.
mplsFTNMapTableLastChanged OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Indicates the last time an entry was added, deleted or
modified in mplsFTNMapTable. Management stations should
consult this object to determine if the table requires
their attention. This object is particularly useful
for applications performing a retrieval on
mplsFTNMapTable to ensure that the table is not
modified during the retrieval operation."
::= { mplsFTNObjects 4 }
-- FTN to interface mapping table.
mplsFTNMapTable OBJECT-TYPE
SYNTAX SEQUENCE OF MplsFTNMapEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains objects which provide the
capability to apply or map FTN rules as defined by
entries in mplsFTNTable to specific interfaces in the
system. FTN rules are compared with incoming packets
in the order in which they are applied on an interface.
The indexing structure of mplsFTNMapTable is as
follows.
- mplsFTNMapIndex indicates the interface to which the
rule is being applied. A value of 0 represents the
application of the rule to all interfaces.
- mplsFTNMapPrevIndex specifies the rule on the
interface prior to the one being applied. A value of
0 specifies that the rule is being inserted at the
head of the list of rules currently applied to the
interface.
- mplsFTNMapCurrIndex is the index in mplsFTNTable
corresponding to the rule being applied.
This indexing structure makes the entries in the table
behave like items in a linked-list. The object
mplsFTNMapPrevIndex in each conceptual row is a pointer
to the previous entry that is applied to a particular
interface. This allows a new entry to be 'inserted' at
an arbitrary position in a list of entries currently
applied to an interface. This object is self-
adjusting, i.e., its value is automatically adjusted by
the agent, if necessary, after an insertion or deletion
operation.
Using this linked-list structure, one can retrieve FTN
entries in the order of application on a per-interface
basis as follows:
- To determine the first FTN entry on an interface
with index ifIndex perform a GETNEXT retrieval
operation on mplsFTNMapRowStatus.ifIndex.0.0; the
returned object, if one exists, is (say)
mplsFTNMapRowStatus.ifIndex.0.n (mplsFTNMapRowStatus
is the first accessible columnar object in the
conceptual row). Then the index of the first FTN
entry applied on this interface is n.
- To determine the FTN entry applied to an interface
after the one indexed by n perform a GETNEXT
retrieval operation on
mplsFTNMapRowStatus.ifIndex.n.0. If such an entry
exists the returned object would be of the form
mplsFTNMapRowStatus.ifIndex.n.m. Then the index of
the next FTN entry applied on this interface is m.
- If the FTN entry indexed by n is the last entry
applied to the interface with index ifIndex then the
object returned would either be:
1.mplsFTNMapRowStatus.ifIndexNext.0.k, where
ifIndexNext is the index of the next interface in
ifTable to which an FTN entry has been applied, in
which case k is the index of the first FTN entry
applied to the interface with index ifIndexNext;
or:
2.mplsFTNMapStorageType.firstIfIndex.0.p, if there
are no more entries in mplsFTNMapTable, where
firstIfIndex is the first entry in ifTable to
which an FTN entry has been mapped.
Use the above steps to retrieve all the applied FTN
entries on a per-interface basis in application order.
Note that the number of retrieval operations is the
same as the number of applied FTN entries (i.e., the
minimum number of GETNEXT operations needed using any
indexing scheme).
Agents MUST NOT allow the same FTN entry as specified
by mplsFTNMapCurrIndex to be applied multiple times to
the same interface.
Agents MUST NOT allow the creation of rows in this
table until the corresponding rows are created in the
mplsFTNTable.
If a row in mplsFTNTable is destroyed, the agent MUST
destroy the corresponding entries (i.e., ones with a
matching value of mplsFTNCurrIndex) in this table as
well."
::= { mplsFTNObjects 5 }
mplsFTNMapEntry OBJECT-TYPE
SYNTAX MplsFTNMapEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Each conceptual row represents the application of an
FTN rule at a specific position in the list of FTN
rules applied on an interface. "
INDEX {
mplsFTNMapIndex,
mplsFTNMapPrevIndex,
mplsFTNMapCurrIndex
}
::= { mplsFTNMapTable 1 }
MplsFTNMapEntry ::= SEQUENCE {
mplsFTNMapIndex InterfaceIndexOrZero,
mplsFTNMapPrevIndex MplsFTNEntryIndexOrZero,
mplsFTNMapCurrIndex MplsFTNEntryIndex,
mplsFTNMapRowStatus RowStatus,
mplsFTNMapStorageType StorageType
}
mplsFTNMapIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The interface index that this FTN entry is being
applied to. A value of zero indicates an entry that is
applied all interfaces.
Entries mapped to an interface by specifying its (non-
zero) interface index in mplsFTNMapIndex are applied
ahead of entries with mplsFTNMapIndex equal to zero."
::= { mplsFTNMapEntry 1 }
mplsFTNMapPrevIndex OBJECT-TYPE
SYNTAX MplsFTNEntryIndexOrZero
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The index of the previous FTN entry that was applied to
this interface. The special value zero indicates that
this should be the first FTN entry in the list."
::= { mplsFTNMapEntry 2 }
mplsFTNMapCurrIndex OBJECT-TYPE
SYNTAX MplsFTNEntryIndex
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Index of the current FTN entry that is being applied to
this interface."
::= { mplsFTNMapEntry 3 }
mplsFTNMapRowStatus OBJECT-TYPE
SYNTAX RowStatus {
active(1),
createAndGo(4),
destroy(6)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Used for controlling the creation and deletion of this
row.
All writable objects in this row may be modified at any
time.
If a conceptual row in mplsFTNMapTable points to a
conceptual row in mplsFTNTable which is subsequently
deleted, the corresponding conceptual row in
mplsFTNMapTable MUST also be deleted by the agent."
::= { mplsFTNMapEntry 4 }
mplsFTNMapStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The storage type for this entry. Conceptual rows
having the value 'permanent' need not allow write-
access to any columnar objects in this row."
DEFVAL { nonVolatile }
::= { mplsFTNMapEntry 5 }
-- End of mplsFTNMapTable
-- FTN entry performance table
mplsFTNPerfTable OBJECT-TYPE
SYNTAX SEQUENCE OF MplsFTNPerfEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains performance statistics on FTN
entries on a per-interface basis."
::= { mplsFTNObjects 6 }
mplsFTNPerfEntry OBJECT-TYPE
SYNTAX MplsFTNPerfEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Each entry contains performance information for the
specified interface and an FTN entry mapped to this
interface."
INDEX { mplsFTNPerfIndex, mplsFTNPerfCurrIndex }
::= { mplsFTNPerfTable 1 }
MplsFTNPerfEntry ::= SEQUENCE {
mplsFTNPerfIndex InterfaceIndexOrZero,
mplsFTNPerfCurrIndex MplsFTNEntryIndex,
mplsFTNPerfMatchedPackets Counter64,
mplsFTNPerfMatchedOctets Counter64,
mplsFTNPerfDiscontinuityTime TimeStamp
}
mplsFTNPerfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The interface index of an interface that an FTN entry
has been applied/mapped to. Each instance of this
object corresponds to an instance of mplsFTNMapIndex."
::= { mplsFTNPerfEntry 1 }
mplsFTNPerfCurrIndex OBJECT-TYPE
SYNTAX MplsFTNEntryIndex
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Index of an FTN entry that has been applied/mapped to
the specified interface. Each instance of this object
corresponds to an instance of mplsFTNMapCurrIndex."
::= { mplsFTNPerfEntry 2 }
mplsFTNPerfMatchedPackets OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets that matched the specified FTN entry
if it is applied/mapped to the specified interface.
Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
mplsFTNDiscontinuityTime."
::= { mplsFTNPerfEntry 3 }
mplsFTNPerfMatchedOctets OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of octets that matched the specified FTN entry
if it is applied/mapped to the specified interface.
Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
mplsFTNDiscontinuityTime."
::= { mplsFTNPerfEntry 4 }
mplsFTNPerfDiscontinuityTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime on the most recent occasion at
which any one or more of this entry's counters suffered
a discontinuity. If no such discontinuities have
occurred since the last re-initialization of the local
management subsystem, then this object contains a zero
value."
::= { mplsFTNPerfEntry 5 }
-- End of mplsFTNPerfTable
-- Module compliance.
-- Top level object IDs.
mplsFTNGroups
OBJECT IDENTIFIER ::= { mplsFTNConformance 1 }
mplsFTNCompliances
OBJECT IDENTIFIER ::= { mplsFTNConformance 2 }
-- Compliance requirement for fully compliant implementations. mplsFTNModuleFullCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance statement for agents that provide full
support for MPLS-FTN-STD-MIB."
MODULE IF-MIB -- The Interfaces Group MIB, RFC 2863. MANDATORY-GROUPS { ifGeneralInformationGroup, ifCounterDiscontinuityGroup }
MODULE -- This module.
MANDATORY-GROUPS {
mplsFTNRuleGroup,
mplsFTNMapGroup,
mplsFTNPerfGroup
}
OBJECT mplsFTNAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is only required to support IPv4
and/or IPv6 addresses. An implementation is only
required to support the address types that are actually
supported on the LSR."
OBJECT mplsFTNSourceAddrMin
SYNTAX InetAddress (SIZE (4 | 20))
DESCRIPTION
"An implementation is only required to support IPv4
and/or IPv6 addresses. An implementation is only
required to support the address types that are actually
supported on the LSR."
OBJECT mplsFTNSourceAddrMax
SYNTAX InetAddress (SIZE (4 | 20))
DESCRIPTION
"An implementation is only required to support IPv4
and/or IPv6 addresses. An implementation is only
required to support the address types that are actually
supported on the LSR."
OBJECT mplsFTNDestAddrMin
SYNTAX InetAddress (SIZE (4 | 20))
DESCRIPTION
"An implementation is only required to support IPv4
and/or IPv6 addresses. An implementation is only
required to support the address types that are actually
supported on the LSR."
OBJECT mplsFTNDestAddrMax
SYNTAX InetAddress (SIZE (4 | 20))
DESCRIPTION
"An implementation is only required to support IPv4
and/or IPv6 addresses. An implementation is only
required to support the address types that are actually
supported on the LSR."
::= { mplsFTNCompliances 1 }
-- Compliance requirement for read-only implementations. mplsFTNModuleReadOnlyCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance requirement for implementations that only
provide read-only support for MPLS-FTN-STD-MIB. Such
devices can then be monitored but cannot be configured
using this MIB module."
MODULE IF-MIB -- The interfaces Group MIB, RFC 2863 MANDATORY-GROUPS { ifGeneralInformationGroup, ifCounterDiscontinuityGroup }
MODULE -- This module
MANDATORY-GROUPS {
mplsFTNRuleGroup,
mplsFTNMapGroup,
mplsFTNPerfGroup
}
OBJECT mplsFTNIndexNext
MIN-ACCESS not-accessible
DESCRIPTION
"This object is not needed when mplsFTNTable is
implemented as read-only."
OBJECT mplsFTNRowStatus
SYNTAX RowStatus { active(1) }
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required, and active is the only
status that needs to be supported."
OBJECT mplsFTNDescr
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNMask
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is only
required to support IPv4 and IPv6 addresses."
OBJECT mplsFTNSourceAddrMin
SYNTAX InetAddress (SIZE (4 | 20))
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is only
required to support IPv4 and IPv6 addresses."
OBJECT mplsFTNSourceAddrMax
SYNTAX InetAddress (SIZE (4 | 20))
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is only
required to support IPv4 and IPv6 addresses."
OBJECT mplsFTNDestAddrMin
SYNTAX InetAddress (SIZE (4 | 20))
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is only
required to support IPv4 and IPv6 addresses."
OBJECT mplsFTNDestAddrMax
SYNTAX InetAddress (SIZE (4 | 20))
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is only
required to support IPv4 and IPv6 addresses."
OBJECT mplsFTNSourcePortMin
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNSourcePortMax
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNDestPortMin
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNDestPortMax
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNProtocol
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNActionType
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNActionPointer
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNDscp
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNStorageType
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsFTNMapRowStatus
SYNTAX RowStatus { active(1) }
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required, and active(1) is the only
status that needs to be supported."
OBJECT mplsFTNMapStorageType
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { mplsFTNCompliances 2 }
-- Units of conformance. mplsFTNRuleGroup OBJECT-GROUP
OBJECTS {
mplsFTNIndexNext,
mplsFTNTableLastChanged,
mplsFTNRowStatus,
mplsFTNDescr,
mplsFTNMask,
mplsFTNAddrType,
mplsFTNSourceAddrMin,
mplsFTNSourceAddrMax,
mplsFTNDestAddrMin,
mplsFTNDestAddrMax,
mplsFTNSourcePortMin,
mplsFTNSourcePortMax,
mplsFTNDestPortMin,
mplsFTNDestPortMax,
mplsFTNProtocol,
mplsFTNActionType,
mplsFTNActionPointer,
mplsFTNDscp,
mplsFTNStorageType
}
STATUS current
DESCRIPTION
"Collection of objects that implement MPLS FTN rules."
::= { mplsFTNGroups 1 }
mplsFTNMapGroup OBJECT-GROUP
OBJECTS {
mplsFTNMapTableLastChanged,
mplsFTNMapRowStatus,
mplsFTNMapStorageType
}
STATUS current
DESCRIPTION
"Collection of objects that implement activation of MPLS
FTN entries on interfaces."
::= { mplsFTNGroups 2 }
mplsFTNPerfGroup OBJECT-GROUP
OBJECTS {
mplsFTNPerfMatchedPackets,
mplsFTNPerfMatchedOctets,
mplsFTNPerfDiscontinuityTime
}
STATUS current
DESCRIPTION
"Collection of objects providing MPLS FTN performance
information."
::= { mplsFTNGroups 3 }
END
10. Security Considerations
This MIB module can be used to configure LSRs to redirect non-MPLS traffic into an MPLS cloud. As such, improper manipulation of the objects represented in this MIB module may result in traffic being redirected to unintended destinations, potentially resulting in denial of service to end-users.
There are a number of management objects defined in this MIB module with a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. These are the tables and objects and their sensitivity/vulnerability:
- mplsFTNTable and mplsFTNMapTable can be used to create packet
matching rules for classifying IPv4 or IPv6 traffic and redirecting matched packets into the MPLS cloud. Modifying objects in these tables can result in the misdirection of traffic and potential denial of service to end-users. It may also result in traffic which was intended to be redirected into the MPLS cloud being routed through the IP network instead, potentially resulting in degradation of service quality or outright denial of service.
Some of the readable objects in this MIB module (i.e., objects with a MAX-ACCESS other than not-accessible) may be considered sensitive or vulnerable in some network environments. It is thus important to control even GET and/or NOTIFY access to these objects and possibly to even encrypt the values of these objects when sending them over the network via SNMP. These are the tables and objects and their sensitivity/vulnerability:
- mplsFTNPerfTable provides counters for monitoring the performance
of packet classification rules defined in mplsFTNTable and mplsFTNMapTable. Unauthorized read access to objects in these tables may be used to gain traffic flow information.
SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module.
It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework (see RFC3410, section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy).
Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED that SNMPv3 be deployed and cryptographic security be enabled. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module is properly configured to give access to the objects to only those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them.
11. IANA Considerations
As described in [MPLSMGMT] and as requested in RFC3811, MPLS related standards-track MIB modules should be rooted under the mplsStdMIB subtree. New assignments can only be made by a standards action as specified in RFC2434.
11.1. IANA Considerations for MPLS-FTN-STD-MIB
The IANA has assigned mplsStdMIB 8 to the MPLS-FTN-STD-MIB module specified in this document.
12. References
12.1. Normative References
RFC2119 Bradner, S., "Key Words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
RFC2578 McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Structure of Management Information Version 2 (SMIv2)",
STD 58, RFC 2578, April 1999.
RFC2579 McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999.
RFC2580 McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999.
RFC2863 McCloghrie, K. and F. Kastenholz, "The Interfaces Group
MIB", RFC 2863, June 2000.
RFC3031 Rosen, E., Viswanathan, A., and R. Callon, "Multiprotocol
Label Switching Architecture", RFC 3031, January 2001.
RFC3289 Baker, F., Chan, K., and A. Smith, "Management Information
Base for the Differentiated Services Architecture", RFC
3289, May 2002.
RFC3291 Daniele, M., Haberman, B., Routhier, S., and J.
Schoenwaelder, "Textual Conventions for Internet Network
Addresses", RFC 3291, May 2002.
RFC3411 Harrington, D., Presuhn, R., and B. Wijnen, "An
Architecture for Describing Simple Network Management
Protocol (SNMP) Management Frameworks", STD 62, RFC 3411,
December 2002.
RFC3813 Srinivasan, C., Viswanathan, A., and T. Nadeau,
"Multiprotocol Label Switching (MPLS) Label Switching
Router (LSR) Management Information Base (MIB)", RFC 3813,
June 2004.
RFC3811 Nadeau, T., and J. Cucchiara, J., Editors, "Definition of
Textual Conventions (TCs) for Multi-Protocol Label
Switching (MPLS) Management", RFC 3811, June 2004.
RFC3812 Srinivasan, C., Viswanathan, A., and T. Nadeau,
"Multiprotocol Label Switching (MPLS) Traffic Engineering
(TE) Management Information Base (MIB)", RFC 3812, June
2004.
12.2. Informative References
[MPLSMGMT] Nadeau, T., Srinivasan, C., and A. Farrel, "Multiprotocol
Label Switching (MPLS) Management Overview", Work in
Progress, September 2003.
RFC791 Postel, J., "Internet Protocol", STD 5, RFC 791, September
1981.
RFC1519 Fuller, V., Li, T., Yu, J., and K. Varadhan, "Classless
Inter-Domain Routing (CIDR): an Address Assignment and
Aggregation Strategy", RFC 1519, September 1993.
RFC2026 Bradner, S., "The Internet Standards Process -- Revision
3", BCP 9, RFC 2026, October 1996.
RFC2434 Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 2434, October 1998.
RFC2460 Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", RFC 2460, December 1998.
RFC2474 Nichols, K., Blake, S., Baker, F., and D. Black,
"Definition of the Differentiated Services Field (DS
Field) in the IPv4 and IPv6 Headers", RFC 2474, December
1998.
RFC3410 Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.
13. Acknowledgements
We would particularly like to thank Bert Wijnen for the substantial time and effort he spent in helping us improve this document. We would also like to thank David Perkins, Joan Cucchiara, Mike Piecuch, and Adrien Grise for their insightful comments and additions to this document.
14. Authors' Addresses
Thomas D. Nadeau Cisco Systems, Inc. 300 Apollo Drive Chelmsford, MA 01824
Phone: +1-978-244-3051 EMail: [email protected]
Cheenu Srinivasan Bloomberg L.P. 499 Park Avenue New York, NY 10022
Phone: +1-212-893-3682 EMail: [email protected]
Arun Viswanathan Force10 Networks, Inc. 1440 McCarthy Blvd Milpitas, CA 95035
Phone: +1-408-571-3516 EMail: [email protected]
15. Full Copyright Statement
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Acknowledgement
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