RFC2787
Network Working Group B. Jewell Request for Comments: 2787 Copper Mountain Networks, Inc. Category: Standards Track D. Chuang
CoSine Communications
March 2000
Definitions of Managed Objects for the
Virtual Router Redundancy Protocol
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 (2000). All Rights Reserved.
Abstract
This specification defines an extension to the Management Information Base (MIB) for use with SNMP-based network management. In particular, it defines objects for configuring, monitoring, and controlling routers that employ the Virtual Router Redundancy Protocol (VRRP) [17].
This memo specifies a MIB module in a manner that is compliant with SMIv2 [5], and semantically identical to the SMIv1 definitions [2].
Contents
The SNMP Management Framework
The SNMP Management Framework presently consists of five major components:
o An overall architecture, described in RFC 2571 [1].
o Mechanisms for describing and naming objects and events for the
purpose of management. The first version of this Structure of Management Information (SMI) is called SMIv1 and described in STD 16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4]. The second version, called SMIv2, is described in STD 58, RFC 2578 [5], STD 58, RFC 2579 [6] and STD 58, RFC 2580 [7].
o Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and described in STD 15, RFC 1157 [8]. A second version of the SNMP message protocol, which is not an Internet standards track protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC 1906 [10]. The third version of the message protocol is called SNMPv3 and described in RFC 1906 [10], RFC 2572 [11] and RFC 2574 [12].
o Protocol operations for accessing management information. The first
set of protocol operations and associated PDU formats is described in STD 15, RFC 1157 [8]. A second set of protocol operations and associated PDU formats is described in RFC 1905 [13].
o A set of fundamental applications described in RFC 2573 [14] and
the view-based access control mechanism described in RFC 2575 [15].
A more detailed introduction to the current SNMP Management Framework can be found in RFC 2570 [16].
Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI.
This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64). Some machine readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine readable information is not considered to change the semantics of the MIB.
Overview
This memo identifies the set of objects for configuring, monitoring, and controlling the Virtual Router Redundancy Protocol (VRRP), as defined in RFC 2338 [17].
VRRP specifies an election protocol that will allow one or more associated IP addresses to be assumed by another router in the event of a failure of the IP address(es) owner. Thus, IP traffic from a host using a failed router as a default gateway is transparently fowarded by the VRRP router that has assumed control. VRRP provides redundancy in routed networks without requiring configuration of dynamic routing or router discovery protocols on every end-host.
Since the VRRP protocol is intended for use with IPv4 routers only, this MIB uses the SYNTAX for IP addresses which is specific to IPv4. Thus, changes will be required for this MIB to interoperate in an IPv6 environment.
VRRP MIB Structure
The VRRP MIB contains three conformance groups:
- vrrpOperations Group: Objects related to VRRP router's
configuration and control.
- vrrpStatistics Group: Objects containing information useful in
monitoring the operation of VRRP routers.
- vrrpNotifications Group: Consists of objects and definitions for
use in SNMP notifications sent by VRRP routers.
Tables in the MIB include the following:
(1) The vrrpOperTable, which contains objects that define the
operational characteristics of a VRRP router. Rows in this table correspond to instances of virtual routers.
(2) The vrrpAssoIpAddrTable, which contains the addresses of the
virtual router(s) that a given VRRP router is backing up.
(3) The vrrpRouterStatsTable which contains the operating statistics
for a VRRP router.
Virtual Router Redundancy Protocol
This MIB is based on the following characteristics of VRRP as defined in the VRRP specification [17].
- A "VRRP router" is one that is configured to run the VRRP protocol
in conjunction with one or more other VRRP routers attached to a LAN.
- A VRRP router can be running one or more instances of a virtual
router.
- A "virtual router" is an abstraction which consists of two or more
physical routers associated by a Virtual Router Identifier (VRID).
- An instance of a virtual router (on a physical VRRP router), can be
uniquely identified by a combination of the 'ifIndex' [18] and "Virtual Router Identifier" (VRID).
- For each VRID there is a set of one or more "associated IP
addresses" that are backed-up by the virtual router.
VRRP MIB Table Design
The tables in the VRRP MIB are structured with the assumption that a VRRP network management application would likely be designed to display information or provide configuration about a VRRP router on a "per-virtual-router basis". Thus, the tables defined in the MIB consist of conceptual rows which are grouped in a manner to present a view of individual virtual routers with a minimal number of SNMP operations.
Relation to Interface Group (RFC 2233) [18].
Since a router can be participating in VRRP on one or more physical interfaces, "ifIndex" is used as an index into the tables defined in the VRRP MIB.
VRRP Scenarios
The following section provides examples of how some of the objects in this MIB are instantiated for two different VRRP scenarios.
KEY:
The labels in the following tables and diagrams correspond to the actual MIB objects as follows:
if = vrrpOperIfIndex VrId = vrrpOperVrId State = vrrpOperState Prior = vrrpOperPriority AddrCnt = vrrpOperIpAddrCount IpAddr = vrrpOperMasterIpAddr RowStat = vrrpOperRowStatus
VRRP Scenario #1
The following figure shows a simple network with two VRRP routers configured with two virtual routers. This sample topology is taken from the VRRP specification [17]. Addresses in '()' indicate the IP address of the default gateway for a given host, H1 - H4. In the diagram, "Interface" is used in the context defined in IF-MIB [18].
VRID=1 VRID=2
+-----+ +-----+
| MR1 | | MR2 |
| & | | & |
| BR2 | | BR1 |
+-----+ +-----+
IP A ---------->* *<---------- IP B
Interface=I1 | | Interface=I2
| |
| |
+------------+-----+--------+--------+--------+--
^ ^ ^ ^
| | | |
(IP A) (IP A) (IP A) (IP A)
| | | |
+--+--+ +--+--+ +--+--+ +--+--+
| H1 | | H2 | | H3 | | H4 |
+-----+ +-----+ +--+--+ +--+--+
----- MIB Tables For VRRP Router "IP A": -----
vrrpOperTable
| if | VrId | State | Prior | AddrCnt | IpAddr | ... | RowStat | +----+------+-------+-------+---------+--------+-( )-+---------+ | | | | | | | | | | I1 | 01 | M | 255 | 1 | A | | active | | | | | | | | | | +----+------+-------+-------+---------+--------+-( )-+---------+ | | | | | | | | | | I1 | 02 | B | 1-254 | 1 | B | | active | | | | | | | | | | +----+------+-------+-------+---------+--------+-( )-+---------+
vrrpAssoIpAddrTable
| if | VrId | IP | RowStat | +----+------+-------+---------+ | | | | | | I1 | 01 | A | active | | | | | | +----+------+-------+---------+ | | | | | | I1 | 02 | B | active | | | | | | +----+------+-------+---------+
----- MIB Tables For VRRP Router "IP B": -----
vrrpOperTable
| if | VrId | State | Prior | AddrCnt | IpAddr | ... | RowStat | +----+------+-------+-------+---------+--------+-( )-+---------+ | | | | | | | | | | I2 | 01 | B | 1-254 | 1 | A | | active | | | | | | | | | | +----+------+-------+-------+---------+--------+-( )-+---------+ | | | | | | | | | | I2 | 02 | M | 255 | 1 | B | | active | | | | | | | | | | +----+------+-------+-------+---------+--------+-( )-+---------+
vrrpAssoIpAddrTable
| if | VrId | IP | RowStat | +----+------+-------+---------+ | | | | | | I2 | 01 | A | active | | | | | | +----+------+-------+---------+ | | | | | | I2 | 02 | B | active | | | | | | +----+------+-------+---------+
NOTES:
1) "I1" and "I2" are used to designate IF indices on each respective
router.
2) For "State": M = Master; B = Backup.
3) In the vrrpOperTable, a "priority" of 255 indicates that the
respective router owns the IP address, e.g., this IP address is native to the router (i.e., "the IP Address Owner" [17]).
VRRP Scenario #2
The following figure shows a simple network with two virtual routers. Here, a single interface has been configured with two IP addresses. Again, addresses in () indicate the IP address of the default gateway for a given host, H1 - H2.
VRID=1 VRID=2
+-----+ +-----+
| MR1 | | MR2 |
| & | | & |
| BR2 | | BR1 |
+-----+ +-----+
IP A ---------->* *<---------- IP B
IP C | | Interface=I2
Interface=I1 | |
| |
| |
+------------+-----+--------+
^ ^
| |
(IP A) (IP B)
| |
+--+--+ +--+--+
| H1 | | H2 |
+-----+ +-----+
----- MIB Tables For VRRP Router "IP A": -----
vrrpOperTable
| if | VrId | State | Prior | AddrCnt | IpAddr | ... | RowStat | +----+------+-------+-------+---------+--------+-( )-+---------+ | | | | | | | | | | I1 | 01 | M | 255 | 2 | A | | active | | | | | | | | | | +----+------+-------+-------+---------+--------+-( )-+---------+ | | | | | | | | | | I1 | 02 | B | 1-254 | 1 | B | | active | | | | | | | | | | +----+------+-------+-------+---------+--------+-( )-+---------+
vrrpAssoIpAddrTable
| if | VrId | IP | RowStat | +----+------+-------+---------+ | | | | | | I1 | 01 | A | active | | | | | | +----+------+-------+---------+ | | | | | | I1 | 01 | C | active | | | | | | +----+------+-------+---------+ | | | | | | I1 | 02 | B | active | | | | | | +----+------+-------+---------+
----- MIB Tables For VRRP Router "IP B": -----
vrrpOperTable
| if | VrId | State | Prior | AddrCnt | IpAddr | ... | RowStat | +----+------+-------+-------+---------+--------+-( )-+---------+ | | | | | | | | | | I2 | 01 | B | 1-254 | 2 | A | | active | | | | | | | | | | +----+------+-------+-------+---------+--------+-( )-+---------+ | | | | | | | | | | I2 | 02 | M | 255 | 1 | B | | active | | | | | | | | | | +----+------+-------+-------+---------+--------+-( )-+---------+
vrrpAssoIpAddrTable
| if | VrId | IP | RowStat | +----+------+-------+---------+ | | | | | | I2 | 01 | A | active | | | | | | +----+------+-------+---------+ | | | | | | I2 | 01 | C | active | | | | | | +----+------+-------+---------+ | | | | | | I2 | 02 | B | active | | | | | | +----+------+-------+---------+
Definitions
VRRP-MIB DEFINITIONS ::= BEGIN
IMPORTS MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE, Counter32, Integer32, IpAddress, mib-2 FROM SNMPv2-SMI
TEXTUAL-CONVENTION, RowStatus, MacAddress, TruthValue, TimeStamp FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP FROM SNMPv2-CONF ifIndex FROM IF-MIB;
vrrpMIB MODULE-IDENTITY
LAST-UPDATED "200003030000Z"
ORGANIZATION "IETF VRRP Working Group"
CONTACT-INFO
"Brian R. Jewell
Postal: Copper Mountain Networks, Inc.
2470 Embarcadero Way
Palo Alto, California 94303
Tel: +1 650 687 3367
E-Mail: [email protected]"
DESCRIPTION
"This MIB describes objects used for managing Virtual Router
Redundancy Protocol (VRRP) routers."
REVISION "200003030000Z" -- 03 Mar 2000
DESCRIPTION "Initial version as published in RFC 2787."
::= { mib-2 68 }
-- ******************************************************************* -- Textual Conventions -- *******************************************************************
VrId ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"A number which, along with an interface index (ifIndex),
serves to uniquely identify a virtual router on a given VRRP
router. A set of one or more associated addresses is assigned
to a VRID."
SYNTAX Integer32 (1..255)
-- ******************************************************************* -- VRRP MIB Groups -- *******************************************************************
vrrpOperations OBJECT IDENTIFIER ::= { vrrpMIB 1 }
vrrpStatistics OBJECT IDENTIFIER ::= { vrrpMIB 2 }
vrrpConformance OBJECT IDENTIFIER ::= { vrrpMIB 3 }
-- ******************************************************************* -- Start of MIB objects -- *******************************************************************
vrrpNodeVersion OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value identifies the particular version of the VRRP
supported by this node."
::= { vrrpOperations 1 }
vrrpNotificationCntl OBJECT-TYPE
SYNTAX INTEGER {
enabled (1),
disabled (2)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Indicates whether the VRRP-enabled router will generate
SNMP traps for events defined in this MIB. 'Enabled'
results in SNMP traps; 'disabled', no traps are sent."
DEFVAL { enabled }
::= { vrrpOperations 2 }
-- ******************************************************************* -- VRRP Operations Table -- *******************************************************************
vrrpOperTable OBJECT-TYPE
SYNTAX SEQUENCE OF VrrpOperEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Operations table for a VRRP router which consists of a
sequence (i.e., one or more conceptual rows) of
'vrrpOperEntry' items."
::= { vrrpOperations 3 }
vrrpOperEntry OBJECT-TYPE
SYNTAX VrrpOperEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the vrrpOperTable containing the operational
characteristics of a virtual router. On a VRRP router,
a given virtual router is identified by a combination
of the IF index and VRID.
Rows in the table cannot be modified unless the value
of `vrrpOperAdminState' is `disabled' and the
`vrrpOperState' has transitioned to `initialize'."
INDEX { ifIndex, vrrpOperVrId }
::= { vrrpOperTable 1 }
VrrpOperEntry ::=
SEQUENCE {
vrrpOperVrId
VrId,
vrrpOperVirtualMacAddr
MacAddress,
vrrpOperState
INTEGER,
vrrpOperAdminState
INTEGER,
vrrpOperPriority
Integer32,
vrrpOperIpAddrCount
Integer32,
vrrpOperMasterIpAddr
IpAddress,
vrrpOperPrimaryIpAddr
IpAddress,
vrrpOperAuthType
INTEGER,
vrrpOperAuthKey
OCTET STRING,
vrrpOperAdvertisementInterval
Integer32,
vrrpOperPreemptMode
TruthValue,
vrrpOperVirtualRouterUpTime
TimeStamp,
vrrpOperProtocol
INTEGER,
vrrpOperRowStatus
RowStatus
}
vrrpOperVrId OBJECT-TYPE
SYNTAX VrId
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object contains the Virtual Router Identifier (VRID)."
::= { vrrpOperEntry 1 }
vrrpOperVirtualMacAddr OBJECT-TYPE
SYNTAX MacAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The virtual MAC address of the virtual router. Although this
object can be derived from the 'vrrpOperVrId' object, it is
defined so that it is easily obtainable by a management
application and can be included in VRRP-related SNMP traps."
::= { vrrpOperEntry 2 }
vrrpOperState OBJECT-TYPE
SYNTAX INTEGER {
initialize(1),
backup(2),
master(3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The current state of the virtual router. This object has
three defined values:
- `initialize', which indicates that all the
virtual router is waiting for a startup event.
- `backup', which indicates the virtual router is
monitoring the availability of the master router.
- `master', which indicates that the virtual router
is forwarding packets for IP addresses that are
associated with this router.
Setting the `vrrpOperAdminState' object (below) initiates
transitions in the value of this object."
::= { vrrpOperEntry 3 }
vrrpOperAdminState OBJECT-TYPE
SYNTAX INTEGER {
up(1),
down(2)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object will enable/disable the virtual router
function. Setting the value to `up', will transition
the state of the virtual router from `initialize' to `backup'
or `master', depending on the value of `vrrpOperPriority'.
Setting the value to `down', will transition the
router from `master' or `backup' to `initialize'. State
transitions may not be immediate; they sometimes depend on
other factors, such as the interface (IF) state.
The `vrrpOperAdminState' object must be set to `down' prior
to modifying the other read-create objects in the conceptual
row. The value of the `vrrpOperRowStatus' object (below)
must be `active', signifying that the conceptual row
is valid (i.e., the objects are correctly set),
in order for this object to be set to `up'."
DEFVAL { down }
::= { vrrpOperEntry 4 }
vrrpOperPriority OBJECT-TYPE
SYNTAX Integer32 (0..255)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the priority to be used for the
virtual router master election process. Higher values imply
higher priority.
A priority of '0', although not settable, is sent by
the master router to indicate that this router has ceased
to participate in VRRP and a backup virtual router should
transition to become a new master.
A priority of 255 is used for the router that owns the
associated IP address(es)."
DEFVAL { 100 }
::= { vrrpOperEntry 5 }
vrrpOperIpAddrCount OBJECT-TYPE
SYNTAX Integer32 (0..255)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of IP addresses that are associated with this
virtual router. This number is equal to the number of rows
in the vrrpAssoIpAddrTable that correspond to a given IF
index/VRID pair."
::= { vrrpOperEntry 6 }
vrrpOperMasterIpAddr OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The master router's real (primary) IP address. This is
the IP address listed as the source in VRRP advertisement
last received by this virtual router."
::= { vrrpOperEntry 7 }
vrrpOperPrimaryIpAddr OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"In the case where there is more than one IP address for
a given `ifIndex', this object is used to specify the IP
address that will become the `vrrpOperMasterIpAddr', should
the virtual router transition from backup to master. If
this object is set to 0.0.0.0, the IP address which is
numerically lowest will be selected."
DEFVAL { '00000000'H } -- 0.0.0.0
::= { vrrpOperEntry 8 }
vrrpOperAuthType OBJECT-TYPE
SYNTAX INTEGER {
noAuthentication(1), -- VRRP protocol exchanges are not
-- authenticated.
simpleTextPassword(2), -- Exchanges are authenticated by a
-- clear text password.
ipAuthenticationHeader(3) -- Exchanges are authenticated using
-- the IP authentication header.
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Authentication type used for VRRP protocol exchanges between
virtual routers. This value of this object is the same for a
given ifIndex.
New enumerations to this list can only be added via a new
RFC on the standards track."
DEFVAL { noAuthentication }
::= { vrrpOperEntry 9 }
vrrpOperAuthKey OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (0..16))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The Authentication Key. This object is set according to
the value of the 'vrrpOperAuthType' object
('simpleTextPassword' or 'ipAuthenticationHeader'). If the
length of the value is less than 16 octets, the agent will
left adjust and zero fill to 16 octets. The value of this
object is the same for a given ifIndex.
When read, vrrpOperAuthKey always returns an Octet String
of length zero."
::= { vrrpOperEntry 10 }
vrrpOperAdvertisementInterval OBJECT-TYPE
SYNTAX Integer32 (1..255)
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The time interval, in seconds, between sending
advertisement messages. Only the master router sends
VRRP advertisements."
DEFVAL { 1 }
::= { vrrpOperEntry 11 }
vrrpOperPreemptMode OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Controls whether a higher priority virtual router will
preempt a lower priority master."
DEFVAL { true }
::= { vrrpOperEntry 12 }
vrrpOperVirtualRouterUpTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is the value of the `sysUpTime' object when this
virtual router (i.e., the `vrrpOperState') transitioned
out of `initialized'."
::= { vrrpOperEntry 13 }
vrrpOperProtocol OBJECT-TYPE
SYNTAX INTEGER {
ip (1),
bridge (2),
decnet (3),
other (4)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The particular protocol being controlled by this Virtual
Router.
New enumerations to this list can only be added via a new
RFC on the standards track."
DEFVAL { ip }
::= { vrrpOperEntry 14 }
vrrpOperRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The row status variable, used in accordance to installation
and removal conventions for conceptual rows. The rowstatus of
a currently active row in the vrrpOperTable is constrained
by the operational state of the corresponding virtual router.
When `vrrpOperRowStatus' is set to active(1), no other
objects in the conceptual row, with the exception of
`vrrpOperAdminState', can be modified. Prior to setting the
`vrrpOperRowStatus' object from `active' to a different value,
the `vrrpOperAdminState' object must be set to `down' and the
`vrrpOperState' object be transitioned to `initialize'.
To create a row in this table, a manager sets this object
to either createAndGo(4) or createAndWait(5). Until instances
of all corresponding columns are appropriately configured,
the value of the corresponding instance of the `vrrpOperRowStatus'
column will be read as notReady(3).
In particular, a newly created row cannot be made active(1)
until (minimally) the corresponding instance of
`vrrpOperVrId' has been set and there is at least one active
row in the `vrrpAssoIpAddrTable' defining an associated
IP address for the virtual router."
::= { vrrpOperEntry 15 }
-- ******************************************************************* -- VRRP Associated IP Address Table -- *******************************************************************
vrrpAssoIpAddrTable OBJECT-TYPE
SYNTAX SEQUENCE OF VrrpAssoIpAddrEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The table of addresses associated with this virtual router."
::= { vrrpOperations 4 }
vrrpAssoIpAddrEntry OBJECT-TYPE
SYNTAX VrrpAssoIpAddrEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the table contains an IP address that is
associated with a virtual router. The number of rows for
a given ifIndex and VrId will equal the number of IP
addresses associated (e.g., backed up) by the virtual
router (equivalent to 'vrrpOperIpAddrCount').
Rows in the table cannot be modified unless the value
of `vrrpOperAdminState' is `disabled' and the
`vrrpOperState' has transitioned to `initialize'."
INDEX { ifIndex, vrrpOperVrId, vrrpAssoIpAddr }
::= { vrrpAssoIpAddrTable 1 }
VrrpAssoIpAddrEntry ::=
SEQUENCE {
vrrpAssoIpAddr
IpAddress,
vrrpAssoIpAddrRowStatus
RowStatus
}
vrrpAssoIpAddr OBJECT-TYPE SYNTAX IpAddress
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The assigned IP addresses that a virtual router is
responsible for backing up."
::= { vrrpAssoIpAddrEntry 1 }
vrrpAssoIpAddrRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The row status variable, used according to installation
and removal conventions for conceptual rows. Setting this
object to active(1) or createAndGo(4) results in the
addition of an associated address for a virtual router.
Destroying the entry or setting it to notInService(2)
removes the associated address from the virtual router.
The use of other values is implementation-dependent."
::= { vrrpAssoIpAddrEntry 2 }
-- ******************************************************************* -- VRRP Router Statistics -- *******************************************************************
vrrpRouterChecksumErrors OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets received with an invalid
VRRP checksum value."
::= { vrrpStatistics 1 }
vrrpRouterVersionErrors OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets received with an unknown
or unsupported version number."
::= { vrrpStatistics 2 }
vrrpRouterVrIdErrors OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current
DESCRIPTION
"The total number of VRRP packets received with an invalid
VRID for this virtual router."
::= { vrrpStatistics 3 }
-- ******************************************************************* -- VRRP Router Statistics Table -- *******************************************************************
vrrpRouterStatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF VrrpRouterStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table of virtual router statistics."
::= { vrrpStatistics 4 }
vrrpRouterStatsEntry OBJECT-TYPE
SYNTAX VrrpRouterStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the table, containing statistics information
about a given virtual router."
AUGMENTS { vrrpOperEntry }
::= { vrrpRouterStatsTable 1 }
VrrpRouterStatsEntry ::=
SEQUENCE {
vrrpStatsBecomeMaster
Counter32,
vrrpStatsAdvertiseRcvd
Counter32,
vrrpStatsAdvertiseIntervalErrors
Counter32,
vrrpStatsAuthFailures
Counter32,
vrrpStatsIpTtlErrors
Counter32,
vrrpStatsPriorityZeroPktsRcvd
Counter32,
vrrpStatsPriorityZeroPktsSent
Counter32,
vrrpStatsInvalidTypePktsRcvd
Counter32,
vrrpStatsAddressListErrors
Counter32,
vrrpStatsInvalidAuthType
Counter32,
vrrpStatsAuthTypeMismatch
Counter32,
vrrpStatsPacketLengthErrors
Counter32
}
vrrpStatsBecomeMaster OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of times that this virtual router's state
has transitioned to MASTER."
::= { vrrpRouterStatsEntry 1 }
vrrpStatsAdvertiseRcvd OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP advertisements received by this
virtual router."
::= { vrrpRouterStatsEntry 2 }
vrrpStatsAdvertiseIntervalErrors OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP advertisement packets received
for which the advertisement interval is different than the
one configured for the local virtual router."
::= { vrrpRouterStatsEntry 3 }
vrrpStatsAuthFailures OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets received that do not pass
the authentication check."
::= { vrrpRouterStatsEntry 4 }
vrrpStatsIpTtlErrors OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current
DESCRIPTION
"The total number of VRRP packets received by the virtual
router with IP TTL (Time-To-Live) not equal to 255."
::= { vrrpRouterStatsEntry 5 }
vrrpStatsPriorityZeroPktsRcvd OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets received by the virtual
router with a priority of '0'."
::= { vrrpRouterStatsEntry 6 }
vrrpStatsPriorityZeroPktsSent OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets sent by the virtual router
with a priority of '0'."
::= { vrrpRouterStatsEntry 7 }
vrrpStatsInvalidTypePktsRcvd OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of VRRP packets received by the virtual router
with an invalid value in the 'type' field."
::= { vrrpRouterStatsEntry 8 }
vrrpStatsAddressListErrors OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of packets received for which the address
list does not match the locally configured list for the
virtual router."
::= { vrrpRouterStatsEntry 9 }
vrrpStatsInvalidAuthType OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of packets received with an unknown
authentication type."
::= { vrrpRouterStatsEntry 10 }
vrrpStatsAuthTypeMismatch OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of packets received with 'Auth Type' not
equal to the locally configured authentication method
(`vrrpOperAuthType')."
::= { vrrpRouterStatsEntry 11 }
vrrpStatsPacketLengthErrors OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of packets received with a packet length
less than the length of the VRRP header."
::= { vrrpRouterStatsEntry 12 }
-- ******************************************************************* -- Trap Definitions -- *******************************************************************
vrrpNotifications OBJECT IDENTIFIER ::= { vrrpMIB 0 }
vrrpTrapPacketSrc OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS accessible-for-notify
STATUS current
DESCRIPTION
"The IP address of an inbound VRRP packet. Used by
vrrpTrapAuthFailure trap."
::= { vrrpOperations 5 }
vrrpTrapAuthErrorType OBJECT-TYPE
SYNTAX INTEGER {
invalidAuthType (1),
authTypeMismatch (2),
authFailure (3)
}
MAX-ACCESS accessible-for-notify
STATUS current
DESCRIPTION
"Potential types of configuration conflicts.
Used by vrrpAuthFailure trap."
::= { vrrpOperations 6 }
vrrpTrapNewMaster NOTIFICATION-TYPE
OBJECTS { vrrpOperMasterIpAddr
}
STATUS current
DESCRIPTION
"The newMaster trap indicates that the sending agent
has transitioned to 'Master' state."
::= { vrrpNotifications 1 }
vrrpTrapAuthFailure NOTIFICATION-TYPE
OBJECTS { vrrpTrapPacketSrc,
vrrpTrapAuthErrorType
}
STATUS current
DESCRIPTION
"A vrrpAuthFailure trap signifies that a packet has
been received from a router whose authentication key
or authentication type conflicts with this router's
authentication key or authentication type. Implementation
of this trap is optional."
::= { vrrpNotifications 2 }
-- ******************************************************************* -- Conformance Information -- *******************************************************************
vrrpMIBCompliances OBJECT IDENTIFIER ::= { vrrpConformance 1 }
vrrpMIBGroups OBJECT IDENTIFIER ::= { vrrpConformance 2 }
-- Compliance Statements
vrrpMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The core compliance statement for all VRRP implementations."
MODULE -- this module
MANDATORY-GROUPS {
vrrpOperGroup,
vrrpStatsGroup
}
OBJECT vrrpOperPriority
WRITE-SYNTAX Integer32 (1..255)
DESCRIPTION "SETable values are from 1 to 255."
::= { vrrpMIBCompliances 1 }
-- Conformance Groups
vrrpOperGroup OBJECT-GROUP
OBJECTS {
vrrpNodeVersion,
vrrpNotificationCntl,
vrrpOperVirtualMacAddr,
vrrpOperState,
vrrpOperAdminState,
vrrpOperPriority,
vrrpOperIpAddrCount,
vrrpOperMasterIpAddr,
vrrpOperPrimaryIpAddr,
vrrpOperAuthType,
vrrpOperAuthKey,
vrrpOperAdvertisementInterval,
vrrpOperPreemptMode,
vrrpOperVirtualRouterUpTime,
vrrpOperProtocol,
vrrpOperRowStatus,
vrrpAssoIpAddrRowStatus
}
STATUS current
DESCRIPTION
"Conformance group for VRRP operations."
::= { vrrpMIBGroups 1 }
vrrpStatsGroup OBJECT-GROUP
OBJECTS {
vrrpRouterChecksumErrors,
vrrpRouterVersionErrors,
vrrpRouterVrIdErrors,
vrrpStatsBecomeMaster,
vrrpStatsAdvertiseRcvd,
vrrpStatsAdvertiseIntervalErrors,
vrrpStatsAuthFailures,
vrrpStatsIpTtlErrors,
vrrpStatsPriorityZeroPktsRcvd,
vrrpStatsPriorityZeroPktsSent,
vrrpStatsInvalidTypePktsRcvd,
vrrpStatsAddressListErrors,
vrrpStatsInvalidAuthType,
vrrpStatsAuthTypeMismatch,
vrrpStatsPacketLengthErrors
}
STATUS current
DESCRIPTION
"Conformance group for VRRP statistics."
::= { vrrpMIBGroups 2 }
vrrpTrapGroup OBJECT-GROUP
OBJECTS {
vrrpTrapPacketSrc,
vrrpTrapAuthErrorType
}
STATUS current
DESCRIPTION
"Conformance group for objects contained in VRRP notifications."
::= { vrrpMIBGroups 3 }
vrrpNotificationGroup NOTIFICATION-GROUP
NOTIFICATIONS {
vrrpTrapNewMaster,
vrrpTrapAuthFailure
}
STATUS current
DESCRIPTION
"The VRRP MIB Notification Group."
::= { vrrpMIBGroups 4 }
END
Security Considerations
There are a number of management objects defined in this MIB that have a MAX-ACCESS clause of read-write or read-create. Such objects may be considered sensitive or vulnerable to security attacks in some networking environments. The support for SET operations in a non- secure environment without proper protection can have a negative effect on VRRP router operations.
A number of objects in the vrrpOperTable possess the read-create attribute. Manipulation of these objects is capable of affecting the operation of a virtual router.
Specific examples of this include, but are not limited to:
o The vrrpOperAdminState object which could be used to disable a
virtual router.
o The vrrpOperPrimaryIpAddr object which, if compromised, could allow
assignment of an invalid IP address to a master router.
o The authentication type/key related objects which could potentially
render the VRRP security mechanisms ineffective.
Of additional concern is the ability to disable the transmission of traps. This would nullify the capability of a virtual router to provide notification in the event of an authentication failure.
SNMPv1 by itself is not a secure environment. 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.
It is recommended that the implementers consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User-based Security Model RFC 2574 RFC2574 and the View- based Access Control Model RFC 2575 RFC2575 is recommended.
It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of this MIB, 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.
Acknowledgements
The authors would like to thank Danny Mitzel, Venkat Prasad, Al Pham, Robert Hinden, Venkat Prasad, Barbera Denny, Fred Baker, Jeff Case, Flavio Fernandes, Acee Lindem, Scott Barvick, and Bert Wijnen for their comments and suggestions.
References
[1] Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture for
Describing SNMP Management Frameworks", RFC 2571, April 1999.
[2] Rose, M. and K. McCloghrie, "Structure and Identification of
Management Information for TCP/IP-based Internets", STD 16, RFC
1155, May 1990.
[3] Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16, RFC 1212, March 1991.
[4] Rose, M., "A Convention for Defining Traps for use with the
SNMP", RFC 1215, March 1991.
[5] 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.
[6] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
M. and S. Waldbusser, "Textual Conventions for SMIv2", STD 58,
RFC 2579, April 1999.
[7] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
M. and S. Waldbusser, "Conformance Statements for SMIv2", STD
58, RFC 2580, April 1999.
[8] Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
Network Management Protocol", STD 15, RFC 1157, May 1990.
[9] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
"Introduction to Community-based SNMPv2", RFC 1901, January
1996.
[10] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
"Transport Mappings for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1906, January 1996.
[11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
Processing and Dispatching for the Simple Network Management
Protocol (SNMP)", RFC 2572, April 1999.
[12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM)
for version 3 of the Simple Network Management Protocol
(SNMPv3)", RFC 2574, April 1999.
[13] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Protocol
Operations for Version 2 of the Simple Network Management
Protocol (SNMPv2)", RFC 1905, January 1996.
[14] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications", RFC
2573, April 1999.
[15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access
Control Model (VACM) for the Simple Network Management Protocol
(SNMP)", RFC 2575, April 1999
[16] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction
to Version 3 of the Internet-standard Network Management
Framework", RFC 2570, April 1999
[17] Knight, S., Weaver, D., Whipple, D., Hinden, R., Mitzel, D.,
Hunt, P., Higginson, P., Shand, M. and Lindem, A., "Virtual
Router Redundancy Protocol", RFC 2338, November 1997.
[18] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB
using SMIv2", RFC 2233, November 1997.
Authors' Addresses
Brian R. Jewell Copper Mountain Networks, Inc. 2470 Embarcadero Way Palo Alto, California 94303 US
Phone: +1 650 687 3367 EMail: [email protected]
David Chuang CoSine Communications 1200 Bridge Parkway Redwood City, CA 94065 US
Phone: +1 650 628 4850 EMail: [email protected]
Intellectual Property Statement
The IETF takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on the IETF's procedures with respect to rights in standards-track and standards- related documentation can be found in BCP-11. Copies of claims of rights made available for publication and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementors or users of this specification can be obtained from the IETF Secretariat.
The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights which may cover technology that may be required to practice this standard. Please address the information to the IETF Executive Director.
Full Copyright Statement
Copyright (C) The Internet Society (2000). All Rights Reserved.
This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English.
The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Acknowledgement
Funding for the RFC Editor function is currently provided by the Internet Society.
