RFC6527
Internet Engineering Task Force (IETF) K. Tata Request for Comments: 6527 Nokia Obsoletes: 2787 March 2012 Category: Standards Track ISSN: 2070-1721
Definitions of Managed Objects for the Virtual Router Redundancy Protocol Version 3 (VRRPv3)
Abstract
This specification defines a portion of the Management Information Base (MIB) for use with network management based on the Simple Network Management Protocol (SNMP). In particular, it defines objects for configuring, monitoring, and controlling routers that employ the Virtual Router Redundancy Protocol Version 3 (VRRPv3) for both IPv4 and IPv6 as defined in RFC 5798. This memo obsoletes RFC 2787.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc6527.
Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.
This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English.
Contents
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.
Introduction
This specification defines a portion of the 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 Version 3 (VRRPv3) for both IPv4 and IPv6 as defined in RFC 5798 RFC5798.
Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 RFC2119.
Relationship to RFC 2787
This document obsoletes RFC 2787 RFC2787. The major changes in this document reflect changes in the VRRP protocol between RFC 2338 RFC2338 and RFC 5798 RFC5798. This document is also updated to conform to current MIB conventions.
Relation to Interface Group (IF-MIB)
Since a router can be participating in VRRP on one or more interfaces, "ifIndex" is used as an index into the tables defined in the VRRP MIB. This MIB module imports ifIndex from the IF-MIB. At this time, the latest version of the IF-MIB is from RFC 2863 RFC2863.
Multi-Stack Implementations
This MIB module is designed to support multi-stack implementations that run VRRP over IPv4 and IPv6. The IP version, Virtual Router Identifier (VRID), and ifIndex are used to uniquely identify rows in a multi-stack implementation.
Interpretation of RFC 5798
During the review of this document, it emerged that there are different possible interpretations of RFC5798. The authors of that document and the VRRP working group were unable to reach consensus as to which interpretation is correct. This document makes the following assumption:
IPv4 and IPv6 virtual routers are treated as two separate logical entities and represented as two separate entries in the vrrpv3OperationsTable. This is required due to the undefined behavior of the protocol in RFC5798 in a multi-stack scenario.
VRRP MIB Structure and Design
This MIB module contains three tables:
(1) The vrrpv3OperationsTable contains objects that define the
operational characteristics of a VRRP router. Rows in this
table correspond to instances of virtual routers.
(2) The vrrpv3StatisticsTable contains the operating statistics for
a VRRP router.
(3) The vrrpv3AssociatedIpAddrTable contains the addresses of the
virtual router(s) that a given VRRP router is backing up.
Tables are indexed on ifIndex, VRID, and the IP version to uniquely identify a VRRP router.
Notifications in this MIB module are controlled using the mechanisms defined in RFC3413.
VRRP Multi-Stack Scenario
The following section provides examples of how some of the objects in this MIB are instantiated.
KEY:
The labels in the following tables and diagrams correspond to the actual MIB objects as follows:
if = IfIndex AddrType= vrrpv3OperationsInetAddrType VrId = vrrpv3OperationsVrId State = vrrpv3OperationsStatus Prior = vrrpv3OperationsPriority IpAddr = vrrpv3OperationsMasterIpAddr
The following figure shows a hypothetical network with two VRRP routers, VR1 & VR2, configured with two virtual routers. Addresses in '()' indicate the address of the default gateway for a given host; H1 to H4 are IPv4 hosts, and H5 to H8 are IPv6 hosts. A, B, and C are IPv4 addresses, and X, Y, and Z are IPv6 addresses. In the diagram, "Interface" is used in the context defined in IF-MIB.
+------+ +------+
| VR1 | | VR2 |
| | | |
+------+ +------+
| |
Intf = I1 Intf = I2
IP A | IP X IP B | IP Y
IP C | | IP Z
VRID = 1 | VRID=2 VRID=2 | VRID = 1
| |
+------+------+-+-------+--------+--------++------+--------+---
^ ^ ^ ^ ^ ^ ^ ^ | | | | | | | | (IP A) (IP A) (IP B) (IP B) (IP X) (IP X) (IP Y) (IP Y) | | | | | | | | +----+ +----+ +----+ +----+ +----+ +----+ +----+ +----+ | H1 | | H2 | | H3 | | H4 | | H5 | | H6 | | H7 | | H8 | +----+ +----+ +----+ +----+ +----+ +----+ +----+ +----+
----- MIB Tables For VRRP Router "VR1": -----
vrrpv3OperationsTable
| if | VrId |AddrType| State | Prior |IpAddr| | +----+------+--------+-------+-------+------+--(..)--+ | I1 | 01 | 1 | M | 255 | A | | +----+------+--------+-------+-------+------+--(..)--+ | I1 | 01 | 2 | B | 1-254 | Y | | +----+------+--------+-------+-------+------+--(..)--+ | I1 | 02 | 1 | B | 1-254 | B | | +----+------+--------+-------+-------+------+--(..)--+ | I1 | 02 | 2 | M | 255 | X | | +----+------+--------+-------+-------+------+--------+
vrrpv3AssociatedIpAddrTable
| if | VrId | AddrType | IP | RowStat | +----+------+----------+------+---------+ | I1 | 01 | 1 | A | active | +----+------+----------+------+---------+ | I1 | 01 | 1 | C | active | +----+------+----------+------+---------+ | I1 | 01 | 2 | Y | active | +----+------+----------+------+---------+ | I1 | 01 | 2 | Z | active | +----+------+----------+------+---------+ | I1 | 02 | 1 | B | active | +----+------+----------+------+---------+ | I1 | 02 | 2 | X | active | +----+------+----------+------+---------+
----- MIB Tables For VRRP Router "VR2": -----
vrrpv3OperationsTable
| if | VrId |AddrType| State | Prior |IpAddr| | +----+------+--------+-------+-------+------+--(..)--+ | I2 | 01 | 1 | B | 1-254 | A | | +----+------+--------+-------+-------|------+--(..)--+ | I2 | 01 | 2 | M | 255 | Y | | +----+------+--------+-------+-------+------+--(..)--+ | I2 | 02 | 1 | M | 255 | B | | +----+------+--------+-------+-------+------+--(..)--+ | I2 | 02 | 2 | B | 1-254 | X | | +----+------+--------+-------+-------+------+--------+
vrrpv3AssociatedIpAddrTable
| if | VrId |AddrType| IP | RowStat | +----+------+--------+------+---------+ | I2 | 01 | 1 | A | active | +----+------+--------+------+---------+ | I2 | 01 | 1 | C | active | +----+------+--------+------+---------+ | I2 | 01 | 2 | Y | active | +----+------+--------+------+---------+ | I2 | 01 | 2 | Z | active | +----+------+--------+------+---------+ | I2 | 02 | 1 | B | active | +----+------+--------+------+---------+ | I2 | 02 | 2 | X | active | +----+------+--------+------+---------+
NOTES:
1) For "State": M = Master; B = Backup.
In the vrrpv3OperationsTable, 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").
10. Definitions
This MIB module makes reference to the following documents RFC2578, RFC2579, RFC2580, RFC2863, and RFC4001.
VRRPV3-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
NOTIFICATION-TYPE, Counter32,
Integer32, mib-2, Unsigned32,
Counter64, TimeTicks
FROM SNMPv2-SMI -- RFC2578
TEXTUAL-CONVENTION, RowStatus,
MacAddress, TruthValue, TimeStamp,
TimeInterval
FROM SNMPv2-TC -- RFC2579
MODULE-COMPLIANCE, OBJECT-GROUP,
NOTIFICATION-GROUP
FROM SNMPv2-CONF -- RFC2580
ifIndex
FROM IF-MIB -- RFC2863
InetAddressType, InetAddress
FROM INET-ADDRESS-MIB; -- RFC4001
vrrpv3MIB MODULE-IDENTITY
LAST-UPDATED "201202130000Z" -- Feb 13, 2012
ORGANIZATION "IETF VRRP Working Group"
CONTACT-INFO
"WG E-Mail: [email protected]
Editor: Kalyan Tata
Nokia
313 Fairchild Dr,
Mountain View, CA 94043
[email protected]"
DESCRIPTION
"This MIB describes objects used for managing Virtual
Router Redundancy Protocol version 3 (VRRPv3).
Copyright (c) 2012 IETF Trust and the persons
identified as authors of the code. All rights
reserved.
Redistribution and use in source and binary forms,
with or without modification, is permitted pursuant
to, and subject to the license terms contained in,
the Simplified BSD License set forth in Section
4.c of the IETF Trust's Legal Provisions Relating
to IETF Documents
(http://trustee.ietf.org/license-info).
This version of the MIB module is part of RFC 6527. Please see the RFC for full legal notices."
REVISION "201202120000Z" -- Feb 13, 2012
DESCRIPTION "Initial version as published in RFC 6527."
::= { mib-2 207 }
-- Textual Conventions
Vrrpv3VrIdTC ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"The value of the Virtual Router Identifier noted as
(VRID) in RFC 5798. This, along with interface index
(ifIndex) and IP version, serves to uniquely identify
a virtual router on a given VRRP router."
REFERENCE "RFC 5798 (Sections 3 and 5.2.3)"
SYNTAX Integer32 (1..255)
-- VRRPv3 MIB Groups
vrrpv3Notifications OBJECT IDENTIFIER ::= { vrrpv3MIB 0 }
vrrpv3Objects OBJECT IDENTIFIER ::= { vrrpv3MIB 1 }
vrrpv3Conformance OBJECT IDENTIFIER ::= { vrrpv3MIB 2 }
-- VRRPv3 MIB Objects
vrrpv3Operations OBJECT IDENTIFIER ::= { vrrpv3Objects 1 }
vrrpv3Statistics OBJECT IDENTIFIER ::= { vrrpv3Objects 2 }
-- VRRPv3 Operations Table
vrrpv3OperationsTable OBJECT-TYPE
SYNTAX SEQUENCE OF Vrrpv3OperationsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Unified Operations table for a VRRP router that
consists of a sequence (i.e., one or more conceptual
rows) of 'vrrpv3OperationsEntry' items each of which
describe the operational characteristics of a virtual
router."
::= { vrrpv3Operations 1 }
vrrpv3OperationsEntry OBJECT-TYPE
SYNTAX Vrrpv3OperationsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the vrrpv3OperationsTable containing the
operational characteristics of a virtual router.
On a VRRP router, a given virtual router is
identified by a combination of ifIndex, VRID, and
the IP version. ifIndex represents an interface of
the router.
A row must be created with vrrpv3OperationsStatus
set to initialize(1) and cannot transition to
backup(2) or master(3) until
vrrpv3OperationsRowStatus is transitioned to
active(1).
The information in this table is persistent and when
written the entity SHOULD save the change to non-
volatile storage."
INDEX { ifIndex, vrrpv3OperationsVrId,
vrrpv3OperationsInetAddrType
}
::= { vrrpv3OperationsTable 1 }
Vrrpv3OperationsEntry ::=
SEQUENCE {
vrrpv3OperationsVrId
Vrrpv3VrIdTC,
vrrpv3OperationsInetAddrType
InetAddressType,
vrrpv3OperationsMasterIpAddr
InetAddress,
vrrpv3OperationsPrimaryIpAddr
InetAddress,
vrrpv3OperationsVirtualMacAddr
MacAddress,
vrrpv3OperationsStatus
INTEGER,
vrrpv3OperationsPriority
Unsigned32,
vrrpv3OperationsAddrCount
Integer32,
vrrpv3OperationsAdvInterval
TimeInterval,
vrrpv3OperationsPreemptMode
TruthValue,
vrrpv3OperationsAcceptMode
TruthValue,
vrrpv3OperationsUpTime
TimeTicks,
vrrpv3OperationsRowStatus
RowStatus
}
vrrpv3OperationsVrId OBJECT-TYPE
SYNTAX Vrrpv3VrIdTC
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object contains the Virtual Router Identifier
(VRID)."
REFERENCE "RFC 4001"
::= { vrrpv3OperationsEntry 1 }
vrrpv3OperationsInetAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The IP address type of Vrrpv3OperationsEntry and
Vrrpv3AssociatedIpAddrEntry. This value determines
the type for vrrpv3OperationsMasterIpAddr,
vrrpv3OperationsPrimaryIpAddr, and
vrrpv3AssociatedIpAddrAddress.
ipv4(1) and ipv6(2) are the only two values supported
in this MIB module."
REFERENCE "RFC 4001"
::= { vrrpv3OperationsEntry 2 }
vrrpv3OperationsMasterIpAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The master router's real IP address. The master router
would set this address to vrrpv3OperationsPrimaryIpAddr
while transitioning to master state. For backup
routers, this is the IP address listed as the source in
the VRRP advertisement last received by this virtual
router."
REFERENCE "RFC 5798"
::= { vrrpv3OperationsEntry 3 }
vrrpv3OperationsPrimaryIpAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"In the case where there is more than one IP
Address (associated IP addresses) for a given
'ifIndex', this object is used to specify the IP
address that will become the
vrrpv3OperationsMasterIpAddr', should the virtual
router transition from backup state to master."
::= { vrrpv3OperationsEntry 4 }
vrrpv3OperationsVirtualMacAddr 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
'vrrpv3OperationsVrId' object, it is defined so that it
is easily obtainable by a management application and
can be included in VRRP-related SNMP notifications."
::= { vrrpv3OperationsEntry 5 }
vrrpv3OperationsStatus 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 the
virtual router is waiting for a startup event.
- 'backup', which indicates that 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."
REFERENCE "RFC 5798"
::= { vrrpv3OperationsEntry 6 }
vrrpv3OperationsPriority OBJECT-TYPE
SYNTAX Unsigned32 (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) for VRRP over IPv4 and hence
is not settable.
Setting the values of this object to 0 or 255 should be
rejected by the agents implementing this MIB module.
For example, an SNMP agent would return 'badValue(3)'
when a user tries to set the values 0 or 255 for this
object."
REFERENCE "RFC 5798, Section 6.1" DEFVAL { 100 } ::= { vrrpv3OperationsEntry 7 }
vrrpv3OperationsAddrCount 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 vrrpv3AssociatedAddrTable that
correspond to a given ifIndex/VRID/IP version."
REFERENCE "RFC 5798, Section 6.1"
::= { vrrpv3OperationsEntry 8 }
vrrpv3OperationsAdvInterval OBJECT-TYPE
SYNTAX TimeInterval (1..4095)
UNITS "centiseconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The time interval, in centiseconds, between sending
advertisement messages. Only the master router sends
VRRP advertisements."
REFERENCE "RFC 5798, Section 6.1"
DEFVAL { 100}
::= { vrrpv3OperationsEntry 9 }
vrrpv3OperationsPreemptMode OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Controls whether a higher priority virtual router will
preempt a lower priority master."
REFERENCE "RFC 5798, Section 6.1"
DEFVAL { true }
::= { vrrpv3OperationsEntry 10 }
vrrpv3OperationsAcceptMode OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Controls whether a virtual router in master state
will accept packets addressed to the address owner's
IPv6 address as its own if it is not the IPv6 address
owner. Default is false(2).
This object is not relevant for rows representing VRRP
over IPv4 and should be set to false(2)."
DEFVAL { false }
::= { vrrpv3OperationsEntry 11 }
vrrpv3OperationsUpTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This value represents the amount of time, in
TimeTicks (hundredth of a second), since this virtual
router (i.e., the 'vrrpv3OperationsStatus')
transitioned out of 'initialize'."
REFERENCE "RFC 5798, Section 6.1"
::= { vrrpv3OperationsEntry 12 }
vrrpv3OperationsRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The RowStatus variable should be used in accordance to
installation and removal conventions for conceptual
rows.
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
'vrrpv3OperationsRowStatus' column will be read as
notReady(3).
In particular, a newly created row cannot be made
active(1) until (minimally) the corresponding instance
of vrrpv3OperationsInetAddrType, vrrpv3OperationsVrId,
and vrrpv3OperationsPrimaryIpAddr has been set, and
there is at least one active row in the
'vrrpv3AssociatedIpAddrTable' defining an associated
IP address.
notInService(2) should be used to administratively
bring the row down.
A typical order of operation to add a row is:
1. Create a row in vrrpv3OperationsTable with
createAndWait(5).
2. Create one or more corresponding rows in
vrrpv3AssociatedIpAddrTable.
3. Populate the vrrpv3OperationsEntry.
4. Set vrrpv3OperationsRowStatus to active(1).
A typical order of operation to delete an entry is:
1. Set vrrpv3OperationsRowStatus to notInService(2).
2. Set the corresponding rows in
vrrpv3AssociatedIpAddrTable to destroy(6) to delete
the entry.
3. Set vrrpv3OperationsRowStatus to destroy(6) to
delete the entry."
::= { vrrpv3OperationsEntry 13 }
-- VRRP Associated Address Table
vrrpv3AssociatedIpAddrTable OBJECT-TYPE
SYNTAX SEQUENCE OF Vrrpv3AssociatedIpAddrEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The table of addresses associated with each virtual
router."
::= { vrrpv3Operations 2 }
vrrpv3AssociatedIpAddrEntry OBJECT-TYPE
SYNTAX Vrrpv3AssociatedIpAddrEntry
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 IP version, VrID, and ifIndex will equal
the number of IP addresses associated (e.g., backed up)
by the virtual router (equivalent to
'vrrpv3OperationsIpAddrCount').
Rows in the table cannot be modified unless the value
of 'vrrpv3OperationsStatus' for the corresponding entry
in the vrrpv3OperationsTable has transitioned to
initialize(1).
The information in this table is persistent and when
written the entity SHOULD save the change to non-
volatile storage."
INDEX { ifIndex, vrrpv3OperationsVrId,
vrrpv3OperationsInetAddrType,
vrrpv3AssociatedIpAddrAddress }
::= { vrrpv3AssociatedIpAddrTable 1 }
Vrrpv3AssociatedIpAddrEntry ::=
SEQUENCE {
vrrpv3AssociatedIpAddrAddress
InetAddress,
vrrpv3AssociatedIpAddrRowStatus
RowStatus
}
vrrpv3AssociatedIpAddrAddress OBJECT-TYPE
SYNTAX InetAddress (SIZE (0|4|16))
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The assigned IP addresses that a virtual router is
responsible for backing up.
The IP address type is determined by the value of
vrrpv3OperationsInetAddrType in the index of this
row."
REFERENCE "RFC 5798"
::= { vrrpv3AssociatedIpAddrEntry 1 }
vrrpv3AssociatedIpAddrRowStatus 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. To create a row in this table, a manager sets
this object to either createAndGo(4) or
createAndWait(5). Setting this object to active(1)
results in the addition of an associated address for a
virtual router. Setting this object to notInService(2)
results in administratively bringing down the row.
Destroying the entry or setting it to destroy(6)
removes the associated address from the virtual router.
The use of other values is implementation-dependent.
Implementations should not allow deletion of the last
row corresponding to an active row in
vrrpv3OperationsTable.
Refer to the description of vrrpv3OperationsRowStatus
for typical row creation and deletion scenarios."
::= { vrrpv3AssociatedIpAddrEntry 2 }
-- VRRP Router Statistics
vrrpv3RouterChecksumErrors OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets received with an
invalid VRRP checksum value.
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
vrrpv3GlobalStatisticsDiscontinuityTime."
REFERENCE "RFC 5798, Section 5.2.8" ::= { vrrpv3Statistics 1 }
vrrpv3RouterVersionErrors OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets received with an
unknown or unsupported version number.
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
vrrpv3GlobalStatisticsDiscontinuityTime."
REFERENCE "RFC 5798, Section 5.2.1" ::= { vrrpv3Statistics 2 }
vrrpv3RouterVrIdErrors OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets received with a
VRID that is not valid for any virtual router on this
router.
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
vrrpv3GlobalStatisticsDiscontinuityTime."
REFERENCE "RFC 5798, Section 5.2.3" ::= { vrrpv3Statistics 3 }
vrrpv3GlobalStatisticsDiscontinuityTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime on the most recent occasion at
which one of vrrpv3RouterChecksumErrors,
vrrpv3RouterVersionErrors, and vrrpv3RouterVrIdErrors
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."
::= { vrrpv3Statistics 4 }
-- VRRP Router Statistics Table
vrrpv3StatisticsTable OBJECT-TYPE
SYNTAX SEQUENCE OF Vrrpv3StatisticsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table of virtual router statistics."
::= { vrrpv3Statistics 5 }
vrrpv3StatisticsEntry OBJECT-TYPE
SYNTAX Vrrpv3StatisticsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the table containing statistics
information about a given virtual router."
AUGMENTS { vrrpv3OperationsEntry }
::= { vrrpv3StatisticsTable 1 }
Vrrpv3StatisticsEntry ::=
SEQUENCE {
vrrpv3StatisticsMasterTransitions
Counter32,
vrrpv3StatisticsNewMasterReason
INTEGER,
vrrpv3StatisticsRcvdAdvertisements
Counter64,
vrrpv3StatisticsAdvIntervalErrors
Counter64,
vrrpv3StatisticsIpTtlErrors
Counter64,
vrrpv3StatisticsProtoErrReason
INTEGER,
vrrpv3StatisticsRcvdPriZeroPackets
Counter64,
vrrpv3StatisticsSentPriZeroPackets
Counter64,
vrrpv3StatisticsRcvdInvalidTypePackets
Counter64,
vrrpv3StatisticsAddressListErrors
Counter64,
vrrpv3StatisticsPacketLengthErrors
Counter64,
vrrpv3StatisticsRowDiscontinuityTime
TimeStamp,
vrrpv3StatisticsRefreshRate
Unsigned32
}
vrrpv3StatisticsMasterTransitions 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 state.
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
vrrpv3StatisticsRowDiscontinuityTime."
::= { vrrpv3StatisticsEntry 1 }
vrrpv3StatisticsNewMasterReason OBJECT-TYPE
SYNTAX INTEGER {
notMaster (0),
priority (1),
preempted (2),
masterNoResponse (3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This indicates the reason for the virtual router to
transition to master state. If the virtual router
never transitioned to master state, the value of this
object is notMaster(0). Otherwise, this indicates the
reason this virtual router transitioned to master
state the last time. Used by vrrpv3NewMaster
notification."
::= { vrrpv3StatisticsEntry 2 }
vrrpv3StatisticsRcvdAdvertisements OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP advertisements received by
this virtual router.
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
vrrpv3StatisticsRowDiscontinuityTime."
::= { vrrpv3StatisticsEntry 3 }
vrrpv3StatisticsAdvIntervalErrors OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP advertisement packets
received for which the advertisement interval is
different from the vrrpv3OperationsAdvInterval
configured on this virtual router.
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
vrrpv3StatisticsRowDiscontinuityTime."
::= { vrrpv3StatisticsEntry 4 }
vrrpv3StatisticsIpTtlErrors OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets received by the
virtual router with IPv4 TTL (for VRRP over IPv4) or
IPv6 Hop Limit (for VRRP over IPv6) not equal to 255.
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
vrrpv3StatisticsRowDiscontinuityTime."
REFERENCE "RFC 5798, Section 5.1.1.3"
::= { vrrpv3StatisticsEntry 5 }
vrrpv3StatisticsProtoErrReason OBJECT-TYPE
SYNTAX INTEGER {
noError (0),
ipTtlError (1),
versionError (2),
checksumError (3),
vrIdError(4)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This indicates the reason for the last protocol
error. This SHOULD be set to noError(0) when no
protocol errors are encountered. Used by
vrrpv3ProtoError notification."
::= { vrrpv3StatisticsEntry 6 }
vrrpv3StatisticsRcvdPriZeroPackets OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets received by the
virtual router with a priority of '0'.
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
vrrpv3StatisticsRowDiscontinuityTime."
REFERENCE "RFC 5798, Section 5.2.4"
::= { vrrpv3StatisticsEntry 7 }
vrrpv3StatisticsSentPriZeroPackets OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of VRRP packets sent by the virtual
router with a priority of '0'.
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
vrrpv3StatisticsRowDiscontinuityTime."
REFERENCE "RFC 5798, Section 5.2.4"
::= { vrrpv3StatisticsEntry 8 }
vrrpv3StatisticsRcvdInvalidTypePackets OBJECT-TYPE
SYNTAX Counter64
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.
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
vrrpv3StatisticsRowDiscontinuityTime."
::= { vrrpv3StatisticsEntry 9 }
vrrpv3StatisticsAddressListErrors OBJECT-TYPE
SYNTAX Counter64
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.
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
vrrpv3StatisticsRowDiscontinuityTime."
::= { vrrpv3StatisticsEntry 10 }
vrrpv3StatisticsPacketLengthErrors OBJECT-TYPE
SYNTAX Counter64
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.
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
vrrpv3StatisticsRowDiscontinuityTime."
::= { vrrpv3StatisticsEntry 11 }
vrrpv3StatisticsRowDiscontinuityTime 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."
::= { vrrpv3StatisticsEntry 12 }
vrrpv3StatisticsRefreshRate OBJECT-TYPE
SYNTAX Unsigned32
UNITS "milliseconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The minimum reasonable polling interval for this entry.
This object provides an indication of the minimum
amount of time required to update the counters in this
entry."
::= { vrrpv3StatisticsEntry 13 }
-- Notification Definitions -- Notifications may be controlled using SNMP-NOTIFICATION-MIB
vrrpv3NewMaster NOTIFICATION-TYPE
OBJECTS {
vrrpv3OperationsMasterIpAddr,
vrrpv3StatisticsNewMasterReason
}
STATUS current
DESCRIPTION
"The newMaster notification indicates that the sending
agent has transitioned to master state."
::= { vrrpv3Notifications 1 }
vrrpv3ProtoError NOTIFICATION-TYPE
OBJECTS {
vrrpv3StatisticsProtoErrReason
}
STATUS current
DESCRIPTION
"The notification indicates that the sending agent has
encountered the protocol error indicated by
vrrpv3StatisticsProtoErrReason."
::= { vrrpv3Notifications 2 }
-- Conformance Information
vrrpv3Compliances OBJECT IDENTIFIER ::= { vrrpv3Conformance 1 }
vrrpv3Groups OBJECT IDENTIFIER ::= { vrrpv3Conformance 2 }
-- Compliance Statements
vrrpv3FullCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement"
MODULE -- this module
MANDATORY-GROUPS {
vrrpv3OperationsGroup,
vrrpv3StatisticsGroup,
vrrpv3InfoGroup,
vrrpv3NotificationsGroup
}
OBJECT vrrpv3OperationsPriority
WRITE-SYNTAX Unsigned32 (1..254)
DESCRIPTION "Setable values are from 1 to 254."
::= { vrrpv3Compliances 1 }
vrrpv3ReadOnlyCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"When this MIB module is implemented without support
for read-create (i.e., in read-only mode), then such
an implementation can claim read-only compliance.
Such a device can then be monitored, but cannot be
configured with this MIB."
MODULE -- this module
MANDATORY-GROUPS {
vrrpv3OperationsGroup,
vrrpv3StatisticsGroup,
vrrpv3StatisticsDiscontinuityGroup,
vrrpv3InfoGroup,
vrrpv3NotificationsGroup
}
OBJECT vrrpv3OperationsPriority
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."
OBJECT vrrpv3OperationsPrimaryIpAddr
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."
OBJECT vrrpv3OperationsAdvInterval
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."
OBJECT vrrpv3OperationsPreemptMode
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."
OBJECT vrrpv3OperationsAcceptMode
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."
OBJECT vrrpv3OperationsRowStatus
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."
OBJECT vrrpv3AssociatedIpAddrRowStatus
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."
::= { vrrpv3Compliances 2 }
-- Conformance Groups
vrrpv3OperationsGroup OBJECT-GROUP
OBJECTS {
vrrpv3OperationsVirtualMacAddr,
vrrpv3OperationsStatus,
vrrpv3OperationsPriority,
vrrpv3OperationsMasterIpAddr,
vrrpv3OperationsAdvInterval,
vrrpv3OperationsPreemptMode,
vrrpv3OperationsAcceptMode,
vrrpv3OperationsUpTime,
vrrpv3OperationsRowStatus,
vrrpv3OperationsAddrCount,
vrrpv3OperationsPrimaryIpAddr,
vrrpv3AssociatedIpAddrRowStatus
}
STATUS current
DESCRIPTION
"Conformance group for VRRPv3 operations."
::= { vrrpv3Groups 1 }
vrrpv3StatisticsGroup OBJECT-GROUP
OBJECTS {
vrrpv3RouterChecksumErrors,
vrrpv3RouterVersionErrors,
vrrpv3RouterVrIdErrors,
vrrpv3StatisticsMasterTransitions,
vrrpv3StatisticsNewMasterReason,
vrrpv3StatisticsRcvdAdvertisements,
vrrpv3StatisticsAdvIntervalErrors,
vrrpv3StatisticsRcvdPriZeroPackets,
vrrpv3StatisticsSentPriZeroPackets,
vrrpv3StatisticsRcvdInvalidTypePackets,
vrrpv3StatisticsIpTtlErrors,
vrrpv3StatisticsProtoErrReason,
vrrpv3StatisticsAddressListErrors,
vrrpv3StatisticsPacketLengthErrors,
vrrpv3StatisticsRowDiscontinuityTime,
vrrpv3StatisticsRefreshRate
}
STATUS current
DESCRIPTION
"Conformance group for VRRPv3 statistics."
::= { vrrpv3Groups 2 }
vrrpv3StatisticsDiscontinuityGroup OBJECT-GROUP
OBJECTS {
vrrpv3GlobalStatisticsDiscontinuityTime
}
STATUS current
DESCRIPTION
"Objects providing information about counter
discontinuities."
::= { vrrpv3Groups 3 }
vrrpv3InfoGroup OBJECT-GROUP
OBJECTS {
vrrpv3StatisticsProtoErrReason,
vrrpv3StatisticsNewMasterReason
}
STATUS current
DESCRIPTION
"Conformance group for objects contained in VRRPv3
notifications."
::= { vrrpv3Groups 4 }
vrrpv3NotificationsGroup NOTIFICATION-GROUP
NOTIFICATIONS {
vrrpv3NewMaster,
vrrpv3ProtoError
}
STATUS current
DESCRIPTION
"The VRRP MIB Notification Group."
::= { vrrpv3Groups 5 }
END
11. Security Considerations
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:
The objects vrrpv3OperationsPriority, vrrpv3OperationsPrimaryIpAddr, vrrpv3OperationsAdvInterval, vrrpv3OperationsPreemptMode, vrrpv3OperationsAcceptMode, vrrpv3OperationsRowStatus, and vrrpv3AssociatedIpAddrRowStatus possess the read-create attribute. Manipulation of these objects is capable of affecting the operation of a virtual router.
Examples of how these objects could adversely affect the operation of a virtual router include:
o An unauthorized change to vrrpv3OperationsPriority can affect the
priority used in master election, resulting in this router either becoming master when it should not, or in some other router being elected by preference. While this will disrupt the operator's plans, it will only replicate the unfortunate failure of multiple routers, and any router that does become master will be capable of filling that role.
o Modification of vrrpv3OperationsPrimaryIpAddr would cause the
configured router to take on an incorrect IP address if it becomes master, which would be potentially very disruptive to the network operation.
o A malicious change to vrrpv3OperationsAdvInterval could either
result in the configured router flooding the network with advertisements when it becomes master, or the new master not advertising frequently enough such that some routers do not learn about the new master.
o vrrpv3OperationsPreemptMode controls whether this router will
preempt another master router. Setting it inappropriately will at worse cause one router to be master against the operator's plans, but that router will still be qualified to operate as a master.
o Setting the vrrpv3OperationsAcceptMode could prevent an
IPv6-capable VRRP router from accepting packets addressed to the address owner's IPv6 address as its own even if it is not the IPv6 address owner. Although the default for this object is false(2), unauthorized setting of this object to false might restrict the function of some parts of the network.
o The vrrpv3OperationsRowStatus object that could be used to disable
a virtual router. While there are other columns that, if changed, could disrupt operations, they cannot be changed without first changing the RowStatus object.
SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPsec), 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.
Implementations MUST provide the security features described by the SNMPv3 framework (see RFC3410), including full support for authentication and privacy via the User-based Security Model (USM) RFC3414 with the AES cipher algorithm RFC3826. Implementations MAY also provide support for the Transport Security Model (TSM)
RFC5591 in combination with a secure transport such as SSH RFC5592 or TLS/DTLS RFC6353.
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.
12. IANA Considerations
The MIB module in this document uses the following IANA-assigned OBJECT IDENTIFIER values recorded in the SMI Numbers registry:
Descriptor OBJECT IDENTIFIER value
---------- -----------------------
vrrpv3MIB { mib-2 207 vrrpv3MIB VRRPV3-MIB }
This document obsoletes RFC 2787. Therefore, IANA has deprecated value 68 under 'mib-2', which is assigned to VRRP-MIB.
13. 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.
RFC3413 Levi, D., Meyer, P., and B. Stewart, "Simple Network
Management Protocol (SNMP) Applications", STD 62, RFC 3413, December 2002.
RFC4001 Daniele, M., Haberman, B., Routhier, S., and J.
Schoenwaelder, "Textual Conventions for Internet Network
Addresses", RFC 4001, February 2005.
RFC5798 Nadas, S., Ed., "Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6", RFC 5798, March 2010.
14. Informative References
RFC2338 Knight, S., Weaver, D., Whipple, D., Hinden, R., Mitzel,
D., Hunt, P., Higginson, P., Shand, M., and A. Lindem,
"Virtual Router Redundancy Protocol", RFC 2338, April 1998.
RFC2787 Jewell, B. and D. Chuang, "Definitions of Managed Objects
for the Virtual Router Redundancy Protocol", RFC 2787, March 2000.
RFC3410 Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.
RFC3414 Blumenthal, U. and B. Wijnen, "User-based Security Model
(USM) for version 3 of the Simple Network Management
Protocol (SNMPv3)", STD 62, RFC 3414, December 2002.
RFC3826 Blumenthal, U., Maino, F., and K. McCloghrie, "The Advanced
Encryption Standard (AES) Cipher Algorithm in the SNMP
User-based Security Model", RFC 3826, June 2004.
RFC5591 Harrington, D. and W. Hardaker, "Transport Security Model
for the Simple Network Management Protocol (SNMP)", RFC
5591, June 2009.
RFC5592 Harrington, D., Salowey, J., and W. Hardaker, "Secure Shell
Transport Model for the Simple Network Management Protocol
(SNMP)", RFC 5592, June 2009.
RFC6353 Hardaker, W., "Transport Layer Security (TLS) Transport
Model for the Simple Network Management Protocol (SNMP)",
RFC 6353, July 2011.
15. Acknowledgments
Kripakaran Karlekar and Brain Jewell helped in design and initial drafts of this specification. This specification is based on RFC 2787. The authors of RFC 2787 are Brian Jewell and David Chuang. The author would also like to thank Bert Wijnen, Dave Thaler, Joan Cucchiara, Mukesh Gupta, Steve Bates, Adrian Farrel, Ben Campbell and Joel M. Halpern for taking time to review the document and provide valuable guidance.
Author's Address
Srinivas Kalyan Tata Nokia 313 Fairchild Dr. Mountain View, CA 94043 EMail: [email protected]
