RFC4368
Network Working Group T. Nadeau Request for Comments: 4368 S. Hegde Category: Standards Track Cisco Systems, Inc.
January 2006
Multiprotocol Label Switching (MPLS) Label-Controlled
Asynchronous Transfer Mode (ATM) and Frame-Relay
Management Interface Definition
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 (2006).
Abstract
This memo defines two MIB modules and corresponding MIB Object Definitions that describe how label-switching-controlled Frame-Relay and Asynchronous Transfer Mode (ATM) interfaces can be managed given the interface stacking as defined in the MPLS-LSR-STD-MIB and MPLS-TE-STD-MIB.
Contents
Introduction
This memo defines how label-switching-controlled Frame-Relay RFC3034 and ATM RFC3035 interfaces can be realized given the interface stacking as defined in the MPLS-LSR-STD RFC3813 and MPLS-TE-STD RFC3812 MIBs. This document also contains a MIB module that sparsely extends the MPLS-LSR-STD MIB's mplsInterfaceConfTable in such a way as to identify which MPLS-type interfaces have LC-ATM or LC-FR capabilities. Comments should be made directly to the MPLS mailing list at [email protected].
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 RFC 2119, reference RFC2119.
Terminology
This document uses terminology from the document describing the MPLS architecture RFC3031, as well as from RFC 3035 and RFC 3034. Specifically, the following terms will be used in this document.
C-FR RFC 3034 defines a label-switching-controlled Frame Relay
(LC-FR) interface. Packets traversing such an interface carry
labels in the DLCI field
C-ATM RFC 3035 defines a label-switching-controlled ATM (LC-ATM)
interface as an ATM interface controlled by the label switching
control component. When a packet traversing such an interface
is received, it is treated as a labeled packet. The packet's
top label is inferred from either the contents of the Virtual
Channel Identifier (VCI) field or the combined contents of the
Virtual Path Identifier (VPI) and VCI fields. Any two LDP
peers that are connected via an LC-ATM interface will use LDP
negotiations to determine which of these cases is applicable to
that interface. Static configuration of labels is also
possible.
When LDP is used to distribute labels for use on label-controlled interfaces, label configuration information may be available in the MPLS-LDP-ATM-STD-MIB RFC3815 when LC-ATM interfaces are used, or the MPLS-LDP-FRAME-RELAY-STD-MIB RFC3815 when LC-FR interfaces are used.
The SNMP 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.
Interface Stacking of LC-ATM
Since LC-ATM interfaces RFC2863 can carry labeled MPLS traffic, they too are considered MPLS subinterfaces with ifType = mpls(166). They differ slightly in their capability from a packet-oriented MPLS interface in that they may carry ATM- or Frame-Relay-encapsulated traffic. It is thus beneficial to identify them as such. To do this, two tables are defined that extend the MPLS-LSR-STD MIB's mplsInterfaceTable (see section 5 for LC-ATM or section 6 for LC-FR).
Structure of the MPLS-LC-ATM-STD-MIB Module
The MPLS-LC-ATM-STD-MIB module is structured simply as a table of entries that sparsely extend those found in the interfaces table. In particular, the entries in the mplsLcAtmStdInterfaceConfTable extend interfaces capable of supporting MPLS, as is defined in RFC3813, to include entries that also support LC-ATM (and their unique attributes). Therefore, the module can be visualized as follows. Note that the ifTable comes from RFC2863, the mplsInterfaceTable from RFC3813, and the mplsLcAtmStdInterfaceConfTable from the MPLS-LC-ATM-STD-MIB module described below.
ifTable mplsInterfaceTable mplsLcAtmStdInterfaceConfTable .1 .2 .2 .3 .4 .4 .4 .5
In the example shown above, five interfaces exist on the device in question. Of those interfaces, those with ifIndex = .2 and .4 are of ifType = mpls(166) indicating that they are capable of MPLS. Of those two, the entry with index .4 is capable of MPLS LC-ATM operations.
Note that the label partition model utilized by the authors of this document reflects widespread implementation and is seen by the MPLS working group as sufficiently flexible to meet the operational needs, even if it is more restrictive than RFC3035 allows. To this end, we have limited the control and unlabeled VPI and VCI to single values. Note that mplsLcAtmStdUnlabTrafVci and mplsLcAtmStdCtrlVci MUST not be equal; nor should mplsLcAtmStdCtrlVpi or mplsLcAtmStdUnlabTrafVpi be equal.
Structure of the MPLS-LC-FR-STD-MIB Module
The MPLS-LC-FR-STD-MIB module is structured simply as a table of entries that sparsely extend those found in the interfaces table. In particular, the entries in the mplsLcFrStdInterfaceConfTable extend interfaces capable of supporting MPLS, as is defined in RFC3813, to include entries that also support LC-Frame Relay (and their unique attributes). Therefore, the module can be visualized as follows. Note that the ifTable comes from RFC2863, the mplsInterfaceTable from RFC3813, and the mplsLcAtmStdInterfaceConfTable from the MPLS-LC-FR-STD-MIB module described below.
ifTable mplsInterfaceTable mplsLcFrStdInterfaceConfTable .1 .2 .2 .3 .4 .4 .4 .5
In the example shown above, five interfaces exist on the device in question. Of those interfaces, those with ifIndex = .2 and .4 are of ifType = mpls(166) indicating that they are capable of MPLS. Of those two, the entry with index .4 is capable of MPLS LC-Frame Relay operations.
Note that even though the architecture as described in RFC3034 calls for supporting mixed labeled and unlabeled traffic, this MIB does not support that, as this capability does not seem to be used operationally. Note that the DLCI ranges represented by mplsLcFrStdTrafficMinDlci to mplsLcFrStdTrafficMaxDlci and mplsLcFrStdCtrlMinDlci to mplsLcFrStdCtrlMaxDlci MUST not overlap.
MPLS Label-Controlled ATM MIB Definitions
The following MIB module imports from RFC2514, RFC3811, and RFC3813.
MPLS-LC-ATM-STD-MIB DEFINITIONS ::= BEGIN IMPORTS
MODULE-IDENTITY, OBJECT-TYPE
FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF
RowStatus, StorageType, TruthValue
FROM SNMPv2-TC
AtmVpIdentifier
FROM ATM-TC-MIB
mplsStdMIB, MplsAtmVcIdentifier
FROM MPLS-TC-STD-MIB
mplsInterfaceIndex
FROM MPLS-LSR-STD-MIB
;
mplsLcAtmStdMIB MODULE-IDENTITY
LAST-UPDATED "200601120000Z" -- 12 January 2006
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]
Subrahmanya Hegde
Postal: Cisco Systems, Inc.
225 East Tazman Drive
Tel: +1-408-525-6562
Email: [email protected]
General comments should be sent to [email protected]
"
DESCRIPTION
"This MIB module contains managed object definitions for
MPLS Label-Controlled ATM interfaces as defined in
RFC3035.
Copyright (C) The Internet Society (2006). This
version of this MIB module is part of RFC 4368; see
the RFC itself for full legal notices."
-- Revision history.
REVISION
"200601120000Z" -- 12 January 2006
DESCRIPTION
"Initial revision, published as part of RFC 4368."
::= { mplsStdMIB 9 }
-- Top level components of this MIB module.
-- Tables, Scalars, Notifications, Conformance
mplsLcAtmStdNotifications OBJECT IDENTIFIER ::= { mplsLcAtmStdMIB 0 }
mplsLcAtmStdObjects OBJECT IDENTIFIER ::= { mplsLcAtmStdMIB 1 }
mplsLcAtmStdConformance OBJECT IDENTIFIER ::= { mplsLcAtmStdMIB 2 }
-- MPLS LC-ATM Interface Configuration Table. mplsLcAtmStdInterfaceConfTable OBJECT-TYPE
SYNTAX SEQUENCE OF MplsLcAtmStdInterfaceConfEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table specifies per-interface MPLS LC-ATM
capability and associated information. In particular,
this table sparsely extends the MPLS-LSR-STD-MIB's
mplsInterfaceConfTable."
::= { mplsLcAtmStdObjects 1 }
mplsLcAtmStdInterfaceConfEntry OBJECT-TYPE
SYNTAX MplsLcAtmStdInterfaceConfEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in this table is created by an LSR for
every interface capable of supporting MPLS LC-ATM.
Each entry in this table will exist only if a
corresponding entry in ifTable and mplsInterfaceConfTable
exists. If the associated entries in ifTable and
mplsInterfaceConfTable are deleted, the corresponding
entry in this table must also be deleted shortly
thereafter."
INDEX { mplsInterfaceIndex }
::= { mplsLcAtmStdInterfaceConfTable 1 }
MplsLcAtmStdInterfaceConfEntry ::= SEQUENCE {
mplsLcAtmStdCtrlVpi AtmVpIdentifier, mplsLcAtmStdCtrlVci MplsAtmVcIdentifier,
mplsLcAtmStdUnlabTrafVpi AtmVpIdentifier, mplsLcAtmStdUnlabTrafVci MplsAtmVcIdentifier, mplsLcAtmStdVcMerge TruthValue, mplsLcAtmVcDirectlyConnected TruthValue, mplsLcAtmLcAtmVPI AtmVpIdentifier, mplsLcAtmStdIfConfRowStatus RowStatus, mplsLcAtmStdIfConfStorageType StorageType
}
mplsLcAtmStdCtrlVpi OBJECT-TYPE
SYNTAX AtmVpIdentifier
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the VPI value over which this
LSR is willing to accept control traffic on
this interface."
::= { mplsLcAtmStdInterfaceConfEntry 1 }
mplsLcAtmStdCtrlVci OBJECT-TYPE
SYNTAX MplsAtmVcIdentifier
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the VCI value over which this
LSR is willing to accept control traffic
on this interface."
::= { mplsLcAtmStdInterfaceConfEntry 2 }
mplsLcAtmStdUnlabTrafVpi OBJECT-TYPE
SYNTAX AtmVpIdentifier
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the VPI value over which this
LSR is willing to accept unlabeled traffic
on this interface."
::= { mplsLcAtmStdInterfaceConfEntry 3 }
mplsLcAtmStdUnlabTrafVci OBJECT-TYPE
SYNTAX MplsAtmVcIdentifier
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the VCI value over which this
LSR is willing to accept unlabeled traffic
on this interface."
::= { mplsLcAtmStdInterfaceConfEntry 4 }
mplsLcAtmStdVcMerge OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If set to true(1), indicates that this interface
is capable of ATM VC merge; otherwise, it MUST
be set to false(2)."
DEFVAL { false }
::= { mplsLcAtmStdInterfaceConfEntry 5 }
mplsLcAtmVcDirectlyConnected OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This value indicates whether an LC-ATM is directly
or indirectly (by means of a VP) connected. If set to
true(1), indicates that this interface is directly
connected LC-ATM; otherwise, it MUST be set to
false(2). Note that although it can be intimated
from RFC 3057 that multiple VPs may be used,
in practice only a single one is used, and therefore
the authors of this MIB module have chosen to model
it as such."
DEFVAL { true }
::= { mplsLcAtmStdInterfaceConfEntry 6 }
mplsLcAtmLcAtmVPI OBJECT-TYPE
SYNTAX AtmVpIdentifier
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the VPI value used for indirectly
connected LC-ATM interfaces. For these
interfaces, the VPI field is not
available to MPLS, and the label MUST be
encoded entirely within the VCI field
(see RFC3035). If the interface is directly
connected, this value MUST be set to zero."
DEFVAL { 0 }
::= { mplsLcAtmStdInterfaceConfEntry 7 }
mplsLcAtmStdIfConfRowStatus OBJECT-TYPE
SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION
"This object is used to create and
delete entries in this table. When configuring
entries in this table, the corresponding
ifEntry and mplsInterfaceConfEntry
MUST exist beforehand. If a manager attempts to
create an entry for a corresponding
mplsInterfaceConfEntry that does not support LC-ATM,
the agent MUST return an inconsistentValue error.
If this table is implemented read-only, then the
agent must set this object to active(1) when this
row is made active. If this table is implemented
writable, then an agent MUST not allow modification
to its objects once this value is set to active(1),
except to mplsLcAtmStdIfConfRowStatus and
mplsLcAtmStdIfConfStorageType."
::= { mplsLcAtmStdInterfaceConfEntry 8 }
mplsLcAtmStdIfConfStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The storage type for this conceptual row.
Conceptual rows having the value 'permanent(4)'
need not allow write-access to any columnar
objects in the row."
DEFVAL { nonVolatile }
::= { mplsLcAtmStdInterfaceConfEntry 9 }
-- End of mplsLcAtmStdInterfaceConfTable
-- Module compliance.
mplsLcAtmStdCompliances
OBJECT IDENTIFIER ::= { mplsLcAtmStdConformance 1 }
mplsLcAtmStdGroups
OBJECT IDENTIFIER ::= { mplsLcAtmStdConformance 2 }
-- Compliance requirement for full compliance
mplsLcAtmStdModuleFullCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance statement for agents that provide
full support for MPLS-LC-ATM-STD-MIB. Such
devices can be monitored and also be configured
using this MIB module."
MODULE -- this module
MANDATORY-GROUPS {
mplsLcAtmStdIfGroup
}
OBJECT mplsLcAtmStdIfConfRowStatus
SYNTAX RowStatus { active(1), notInService(2) }
WRITE-SYNTAX RowStatus { active(1), notInService(2),
createAndGo(4), destroy(6)
}
DESCRIPTION "Support for createAndWait and notReady is
not required."
::= { mplsLcAtmStdCompliances 1 }
-- Compliance requirement for read-only implementations.
mplsLcAtmStdModuleReadOnlyCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance requirement for implementations that only
provide read-only support for MPLS-LC-ATM-STD-MIB.
Such devices can be monitored but cannot be configured
using this MIB module.
"
MODULE -- this module
MANDATORY-GROUPS {
mplsLcAtmStdIfGroup
}
-- mplsLcAtmStdInterfaceConfTable
OBJECT mplsLcAtmStdCtrlVpi
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcAtmStdCtrlVci
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcAtmStdUnlabTrafVpi
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcAtmStdUnlabTrafVci
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcAtmStdVcMerge
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcAtmStdIfConfRowStatus
SYNTAX RowStatus { active(1) }
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."
OBJECT mplsLcAtmVcDirectlyConnected
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcAtmLcAtmVPI
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcAtmStdIfConfStorageType
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { mplsLcAtmStdCompliances 2 }
-- Units of conformance.
mplsLcAtmStdIfGroup OBJECT-GROUP
OBJECTS {
mplsLcAtmStdCtrlVpi,
mplsLcAtmStdCtrlVci,
mplsLcAtmStdUnlabTrafVpi,
mplsLcAtmStdUnlabTrafVci,
mplsLcAtmStdVcMerge,
mplsLcAtmVcDirectlyConnected,
mplsLcAtmLcAtmVPI,
mplsLcAtmStdIfConfRowStatus,
mplsLcAtmStdIfConfStorageType
}
STATUS current
DESCRIPTION
"Collection of objects needed for MPLS LC-ATM
interface configuration."
::= { mplsLcAtmStdGroups 1 }
END
MPLS Label-Controlled Frame Relay MIB Definitions
The following MIB module imports from RFC2115, RFC3811, and RFC3813.
MPLS-LC-FR-STD-MIB DEFINITIONS ::= BEGIN IMPORTS
MODULE-IDENTITY, OBJECT-TYPE
FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF
RowStatus, StorageType
FROM SNMPv2-TC
mplsInterfaceIndex
FROM MPLS-LSR-STD-MIB
DLCI
FROM FRAME-RELAY-DTE-MIB
mplsStdMIB
FROM MPLS-TC-STD-MIB
;
mplsLcFrStdMIB MODULE-IDENTITY
LAST-UPDATED "200601120000Z" -- 12 January 2006
ORGANIZATION "Multiprotocol Label Switching (MPLS) Working Group"
CONTACT-INFO
" Thomas D. Nadeau
Cisco Systems, Inc.
Email: [email protected]
Subrahmanya Hegde
Email: [email protected]
General comments should be sent to [email protected] " DESCRIPTION "This MIB module contains managed object definitions for MPLS Label-Controlled Frame-Relay interfaces as defined in (RFC3034).
Copyright (C) The Internet Society (2006). This
version of this MIB module is part of RFC 4368; see
the RFC itself for full legal notices."
-- Revision history.
REVISION
"200601120000Z" -- 12 January 2006
DESCRIPTION
"Initial revision, published as part of RFC 4368."
::= { mplsStdMIB 10 }
-- Top level components of this MIB module. -- Tables, Scalars, Notifications, Conformance
mplsLcFrStdNotifications OBJECT IDENTIFIER ::= { mplsLcFrStdMIB 0 } mplsLcFrStdObjects OBJECT IDENTIFIER ::= { mplsLcFrStdMIB 1 } mplsLcFrStdConformance OBJECT IDENTIFIER ::= { mplsLcFrStdMIB 2 }
-- MPLS LC-FR Interface Configuration Table. mplsLcFrStdInterfaceConfTable OBJECT-TYPE
SYNTAX SEQUENCE OF MplsLcFrStdInterfaceConfEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table specifies per-interface MPLS LC-FR
capability and associated information. In particular,
this table sparsely extends the MPLS-LSR-STD-MIB's
mplsInterfaceConfTable."
::= { mplsLcFrStdObjects 1 }
mplsLcFrStdInterfaceConfEntry OBJECT-TYPE
SYNTAX MplsLcFrStdInterfaceConfEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in this table is created by an LSR for
every interface capable of supporting MPLS LC-FR.
Each entry in this table will exist only if a
corresponding entry in ifTable and mplsInterfaceConfTable
exists. If the associated entries in ifTable and
mplsInterfaceConfTable are deleted, the corresponding
entry in this table must also be deleted shortly
thereafter."
INDEX { mplsInterfaceIndex }
::= { mplsLcFrStdInterfaceConfTable 1 }
MplsLcFrStdInterfaceConfEntry ::= SEQUENCE {
mplsLcFrStdTrafficMinDlci DLCI, mplsLcFrStdTrafficMaxDlci DLCI, mplsLcFrStdCtrlMinDlci DLCI, mplsLcFrStdCtrlMaxDlci DLCI, mplsLcFrStdInterfaceConfRowStatus RowStatus,
mplsLcFrStdInterfaceConfStorageType StorageType
}
mplsLcFrStdTrafficMinDlci OBJECT-TYPE
SYNTAX DLCI
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the minimum DLCI value over which this
LSR is willing to accept traffic on this
interface."
::= { mplsLcFrStdInterfaceConfEntry 1 }
mplsLcFrStdTrafficMaxDlci OBJECT-TYPE
SYNTAX DLCI
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the max DLCI value over which this
LSR is willing to accept traffic on this
interface."
::= { mplsLcFrStdInterfaceConfEntry 2 }
mplsLcFrStdCtrlMinDlci OBJECT-TYPE
SYNTAX DLCI
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the min DLCI value over which this
LSR is willing to accept control traffic
on this interface."
::= { mplsLcFrStdInterfaceConfEntry 3 }
mplsLcFrStdCtrlMaxDlci OBJECT-TYPE
SYNTAX DLCI
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the max DLCI value over which this
LSR is willing to accept control traffic
on this interface."
::= { mplsLcFrStdInterfaceConfEntry 4 }
mplsLcFrStdInterfaceConfRowStatus OBJECT-TYPE
SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION
"This object is used to create and
delete entries in this table. When configuring
entries in this table, the corresponding ifEntry and
mplsInterfaceConfEntry MUST exist beforehand. If a manager
attempts to create an entry for a corresponding
mplsInterfaceConfEntry that does not support LC-FR,
the agent MUST return an inconsistentValue error.
If this table is implemented read-only, then the
agent must set this object to active(1) when this
row is made active. If this table is implemented
writable, then an agent MUST not allow modification
to its objects once this value is set to active(1),
except to mplsLcFrStdInterfaceConfRowStatus and
mplsLcFrStdInterfaceConfStorageType."
::= { mplsLcFrStdInterfaceConfEntry 5 }
mplsLcFrStdInterfaceConfStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The storage type for this conceptual row.
Conceptual rows having the value 'permanent(4)'
need not allow write-access to any columnar
objects in the row."
DEFVAL { nonVolatile }
::= { mplsLcFrStdInterfaceConfEntry 6 }
-- End of mplsLcFrStdInterfaceConfTable
-- Module compliance.
mplsLcFrStdCompliances
OBJECT IDENTIFIER ::= { mplsLcFrStdConformance 1 }
mplsLcFrStdGroups
OBJECT IDENTIFIER ::= { mplsLcFrStdConformance 2 }
-- Compliance requirement for full compliance
mplsLcFrStdModuleFullCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance statement for agents that provide
full support for MPLS-LC-FR-STD-MIB. Such
devices can be monitored and also be configured
using this MIB module."
MODULE -- this module
MANDATORY-GROUPS {
mplsLcFrStdIfGroup
}
OBJECT mplsLcFrStdInterfaceConfRowStatus
SYNTAX RowStatus { active(1), notInService(2) }
WRITE-SYNTAX RowStatus { active(1), notInService(2),
createAndGo(4), destroy(6)
}
DESCRIPTION "Support for createAndWait and notReady is
not required."
::= { mplsLcFrStdCompliances 1 }
-- Compliance requirement for read-only implementations.
mplsLcFrStdModuleReadOnlyCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Compliance requirement for implementations that only
provide read-only support for MPLS-LC-FR-STD-MIB.
Such devices can be monitored but cannot be configured
using this MIB module.
"
MODULE -- this module
MANDATORY-GROUPS {
mplsLcFrStdIfGroup
}
-- mplsLcFrStdInterfaceConfTable
OBJECT mplsLcFrStdTrafficMinDlci
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcFrStdTrafficMaxDlci
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcFrStdCtrlMinDlci
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcFrStdCtrlMaxDlci
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT mplsLcFrStdInterfaceConfRowStatus
SYNTAX RowStatus { active(1) }
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."
OBJECT mplsLcFrStdInterfaceConfStorageType
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { mplsLcFrStdCompliances 2 }
-- Units of conformance.
mplsLcFrStdIfGroup OBJECT-GROUP
OBJECTS {
mplsLcFrStdTrafficMinDlci,
mplsLcFrStdTrafficMaxDlci,
mplsLcFrStdCtrlMinDlci,
mplsLcFrStdCtrlMaxDlci,
mplsLcFrStdInterfaceConfRowStatus,
mplsLcFrStdInterfaceConfStorageType
}
STATUS current
DESCRIPTION
"Collection of objects needed for MPLS LC-FR
interface configuration."
::= { mplsLcFrStdGroups 1 }
END
Acknowledgments
We wish to thank Joan Cucchiara and Carlos Pignataro for their comments on this document.
10. Security Considerations
It is clear that these MIB modules are potentially useful for monitoring MPLS LSRs supporting LC-ATM and/or LC-FR. These MIBs can also be used for configuration of certain objects, and anything that can be configured can be incorrectly configured, with potentially disastrous results.
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:
o the MplsLcAtmStdInterfaceConfTable and
mplsLcFrStdInterfaceConfTable collectively contain objects that
may be used to provision MPLS LC or FR-enabled interfaces.
Unauthorized access to objects in these tables could result in
disruption of traffic on the network. This is especially true
if traffic has been established over these interfaces. The use
of stronger mechanisms such as SNMPv3 security should be
considered where possible. Specifically, SNMPv3 VACM and USM
MUST be used with any v3 agent that implements this MIB module.
Administrators should consider whether read access to these
objects should be allowed, since read access may be undesirable
under certain circumstances.
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:
o the MplsLcAtmStdInterfaceConfTable and
mplsLcFrStdInterfaceConfTable collectively show the LC-ATM
and/or LC-FR interfaces, their associated configurations, and
their linkages to other MPLS-related configuration and/or
performance statistics. Administrators not wishing to reveal
this information should consider these objects
sensitive/vulnerable and take precautions so they are not
revealed.
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 to deploy SNMPv3 and to enable cryptographic security. 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 only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them.
11. IANA Considerations
As described in and as requested in the MPLS-TC-STD-MIB RFC3811, MPLS-related standards track MIB modules should be rooted under the mplsStdMIB subtree. There are 2 MPLS MIB modules contained in this document; each of the following "IANA Considerations" subsections requested from IANA a new assignment under the mplsStdMIB subtree. New assignments can only be made via a Standards Action as specified in RFC2434.
11.1. IANA Considerations for MPLS-LC-ATM-STD-MIB
The IANA has assigned { mplsStdMIB 9 } to the MPLS-LC-ATM-STD-MIB module specified in this document.
11.2. IANA Considerations for MPLS-LC-FR-STD-MIB
The IANA has assigned { mplsStdMIB 10 } to the MPLS-LC-FR-STD-MIB module specified in this document.
12. References
12.1. Normative References
RFC3034 Conta, A., Doolan, P., and A. Malis, "Use of Label
Switching on Frame Relay Networks Specification", RFC
3034, January 2001.
RFC3035 Davie, B., Lawrence, J., McCloghrie, K., Rosen, E.,
Swallow, G., Rekhter, Y., and P. Doolan, "MPLS using LDP
and ATM VC Switching", RFC 3035, January 2001.
RFC2115 Brown, C. and F. Baker, "Management Information Base for
Frame Relay DTEs Using SMIv2", RFC 2115, September 1997.
RFC2514 Noto, M., Spiegel, E., and K. Tesink, "Definitions of
Textual Conventions and OBJECT-IDENTITIES for ATM
Management", RFC 2514, February 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.
RFC3811 Nadeau, T. and J. Cucchiara, "Definitions of Textual
Conventions (TCs) for Multiprotocol 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.
RFC3813 Srinivasan, C., Viswanathan, A., and T. Nadeau,
"Multiprotocol Label Switching (MPLS) Label Switching
Router (LSR) Management Information Base (MIB)", RFC
3813, June 2004.
RFC2119 Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
RFC2578 McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M., and S. Waldbusser, "Structure of Management
Information Version 2 (SMIv2)", STD 58, RFC 2578, April
1999.
RFC2579 McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M., and S. Waldbusser, "Textual Conventions for
SMIv2", STD 58, RFC 2579, April 1999.
RFC2580 McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M., and S. Waldbusser, "Conformance Statements for
SMIv2", STD 58, RFC 2580, April 1999.
12.2. Informative References
RFC2434 Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 2434, October 1998.
RFC3410 Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.
RFC3815 Cucchiara, J., Sjostrand, H., and J. Luciani,
"Definitions of Managed Objects for the Multiprotocol
Label Switching (MPLS), Label Distribution Protocol
(LDP)", RFC 3815, June 2004.
Authors' Addresses
Thomas D. Nadeau Cisco Systems, Inc. 300 Beaver Brook Road Boxboro, MA 01719
Phone: +1-978-936-1470 EMail: [email protected]
Subrahmanya Hegde Cisco Systems, Inc. 225 East Tazman Drive San Jose, CA 95134
Phone: +1-408-525-6562 EMail: [email protected]
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