BGP4-MIB

All MIBs › BGP4-MIB

Organization: IETF IDR Working Group

Last Updated: 2006-01-11

Category: Routing Protocols

Description: Defines managed objects for managing Border Gateway Protocol version 4, including BGP peer status, route information, and session attributes.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring BGP4-MIB with a free 30-day trial of IPNetwork Monitor.

What Is BGP4-MIB?

BGP4-MIB, standardized in RFC 4273, is the vendor-neutral IETF MIB module for managing and monitoring Border Gateway Protocol version 4, the routing protocol underlying inter-domain routing on the Internet. It exposes a BGP peer table with per-peer session state, negotiated attributes, and traffic/error counters, along with tables describing received path attributes for individual routes. It is used chiefly to monitor the software/protocol status of a router's BGP process — peer session establishment state, session uptime, and update/notification message counters that reveal a flapping or misconfigured peering session. As a foundational routing MIB it has no dependency on other MIBs beyond standard SNMP conventions, though it is commonly deployed alongside the newer BGP4V2-TC-MIB and vendor-specific BGP extension MIBs for IPv6/VPN address families. It's typically deployed on any vendor's core or edge router or route reflector participating in BGP peering, especially at ISPs, Internet exchange points, and large enterprise WAN edges. Network engineers frequently look up the bgp4 mib support matrix when selecting monitoring tools, since it remains the most universally implemented BGP telemetry source across router vendors.

IPNetwork Monitor allows you to monitor SNMP objects defined in BGP4-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

vendor-neutral, standards-based MIB (RFC 4273), not tied to a specific manufacturer
any BGP-speaking router or route reflector

Monitoring Examples

An administrator would poll bgpPeerTable's bgpPeerState (e.g., Idle, Active, Established) and bgpPeerFsmEstablishedTime to confirm a peer session is stable and compute its uptime. bgpPeerInUpdates and bgpPeerOutUpdates track update-message volume, revealing route flapping, while bgpPeerLastError surfaces the cause of an unexpected session reset. bgpPeerRemoteAs and bgpPeerRemoteAddr identify which neighboring AS and router are involved when troubleshooting a specific peering relationship.

What Can Be Monitored

BGP peer session state (Idle/Connect/Established)
peer session established time/uptime
update and notification message counts
last error/reset cause
negotiated peer AS number and remote address

Imported Objects

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
Integer32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
mib-2

OIDs

OID symbolic	OID numeric	Type	Access	Description
bgp	1.3.6.1.2.1.15			The MIB module for the BGP-4 protocol. Copyright (C) The Internet Society (2006). This version of this MIB module is part of RFC 4273; see the RFC itself for full legal notices.
bgp4MIBCompliance	1.3.6.1.2.1.15.8.1.1			The compliance statement for entities which implement the BGP4 mib.
bgp4MIBCompliances	1.3.6.1.2.1.15.8.1
bgp4MIBConformance	1.3.6.1.2.1.15.8
bgp4MIBDeprecatedCompliances	1.3.6.1.2.1.15.8.1.2			The compliance statement documenting deprecated objects in the BGP4 mib.
bgp4MIBGlobalsGroup	1.3.6.1.2.1.15.8.2.1			A collection of objects providing information on global BGP state.
bgp4MIBGroups	1.3.6.1.2.1.15.8.2
bgp4MIBNotificationGroup	1.3.6.1.2.1.15.8.2.6			A collection of notifications for signaling changes in BGP peer relationships. Obsoletes bgp4MIBTrapGroup.
bgp4MIBObsoleteCompliances	1.3.6.1.2.1.15.8.1.3			The compliance statement documenting obsolete objects in the BGP4 mib.
bgp4MIBPathAttrGroup	1.3.6.1.2.1.15.8.2.4			A collection of objects for managing BGP path entries.
bgp4MIBPeerGroup	1.3.6.1.2.1.15.8.2.2			A collection of objects for managing BGP peers.
bgp4MIBTrapGroup	1.3.6.1.2.1.15.8.2.5			A collection of notifications for signaling changes in BGP peer relationships. Obsoleted by bgp4MIBNotificationGroup
IP bgp4PathAttrAggregatorAddr	1.3.6.1.2.1.15.6.1.11	IpAddress	read-only	The IP address of the last BGP4 speaker that performed route aggregation. A value of 0.0.0.0 indicates the absence of this attribute.
I32 bgp4PathAttrAggregatorAS	1.3.6.1.2.1.15.6.1.10	Integer32	read-only	The AS number of the last BGP4 speaker that performed route aggregation. A value of zero (0) indicates the absence of this attribute. Note that propagation of AS of zero is illegal in the Internet.
OCT bgp4PathAttrASPathSegment	1.3.6.1.2.1.15.6.1.5	OCTET STRING	read-only	The sequence of AS path segments. Each AS path segment is represented by a triple . The type is a 1-octet field that has two possible values: 1 AS_SET: unordered set of ASes that a route in the UPDATE message has traversed 2 AS_SEQUENCE: ordered set of ASes that a route in the UPDATE message has traversed. The length is a 1-octet field containing the number of ASes in the value field. The value field contains one or more AS numbers. Each AS is represented in the octet string as a pair of octets according to the following algorithm: first-byte-of-pair = ASNumber / 256; second-byte-of-pair = ASNumber & 255; Known Issues: o BGP Confederations will result in a type of either 3 or 4. o An AS Path may be longer than 255 octets. This may result in this object containing a truncated AS Path.
INT bgp4PathAttrAtomicAggregate	1.3.6.1.2.1.15.6.1.9	INTEGER	read-only	If the ATOMIC_AGGREGATE attribute is present in the Path Attributes then this object MUST have a value of 'lessSpecificRouteNotSelected'. If the ATOMIC_AGGREGATE attribute is missing in the Path Attributes then this object MUST have a value of 'lessSpecificRouteSelected'. Note that ATOMIC_AGGREGATE is now a primarily informational attribute.
INT bgp4PathAttrBest	1.3.6.1.2.1.15.6.1.13	INTEGER	read-only	An indication of whether this route was chosen as the best BGP4 route for this destination.
I32 bgp4PathAttrCalcLocalPref	1.3.6.1.2.1.15.6.1.12	Integer32	read-only	The degree of preference calculated by the receiving BGP4 speaker for an advertised route. A value of -1 indicates the absence of this attribute. Known Issues: o The BGP-4 specification uses an unsigned 32 bit number and thus this object cannot represent the full range of the protocol.
bgp4PathAttrEntry	1.3.6.1.2.1.15.6.1		not-accessible	Information about a path to a network.
IP bgp4PathAttrIpAddrPrefix	1.3.6.1.2.1.15.6.1.3	IpAddress	read-only	An IP address prefix in the Network Layer Reachability Information field. This object is an IP address containing the prefix with length specified by bgp4PathAttrIpAddrPrefixLen. Any bits beyond the length specified by bgp4PathAttrIpAddrPrefixLen are zeroed.
I32 bgp4PathAttrIpAddrPrefixLen	1.3.6.1.2.1.15.6.1.2	Integer32	read-only	Length in bits of the IP address prefix in the Network Layer Reachability Information field.
I32 bgp4PathAttrLocalPref	1.3.6.1.2.1.15.6.1.8	Integer32	read-only	The originating BGP4 speaker's degree of preference for an advertised route. A value of -1 indicates the absence of this attribute. Known Issues: o The BGP-4 specification uses an unsigned 32 bit number and thus this object cannot represent the full range of the protocol.
I32 bgp4PathAttrMultiExitDisc	1.3.6.1.2.1.15.6.1.7	Integer32	read-only	This metric is used to discriminate between multiple exit points to an adjacent autonomous system. A value of -1 indicates the absence of this attribute. Known Issues: o The BGP-4 specification uses an unsigned 32 bit number. Thus, this object cannot represent the full range of the protocol.
IP bgp4PathAttrNextHop	1.3.6.1.2.1.15.6.1.6	IpAddress	read-only	The address of the border router that should be used for the destination network. This address is the NEXT_HOP address received in the UPDATE packet.
INT bgp4PathAttrOrigin	1.3.6.1.2.1.15.6.1.4	INTEGER	read-only	The ultimate origin of the path information.
IP bgp4PathAttrPeer	1.3.6.1.2.1.15.6.1.1	IpAddress	read-only	The IP address of the peer where the path information was learned.
bgp4PathAttrTable	1.3.6.1.2.1.15.6		not-accessible	The BGP-4 Received Path Attribute Table contains information about paths to destination networks, received from all BGP4 peers.
OCT bgp4PathAttrUnknown	1.3.6.1.2.1.15.6.1.14	OCTET STRING	read-only	One or more path attributes not understood by this BGP4 speaker. Path attributes are recorded in the Update Path attribute format of type, length, value. Size zero (0) indicates the absence of such attributes. Octets beyond the maximum size, if any, are not recorded by this object. Known Issues: o Attributes understood by this speaker, but not represented in this MIB, are unavailable to the agent.
NTF bgpBackwardTransition	1.3.6.1.2.1.15.7.2			The bgpBackwardTransition event is generated when the BGP FSM moves from a higher numbered state to a lower numbered state. This Notification has been replaced by the bgpBackwardTransNotification Notification.
NTF bgpBackwardTransNotification	1.3.6.1.2.1.15.0.2			The bgpBackwardTransNotification event is generated when the BGP FSM moves from a higher numbered state to a lower numbered state. This Notification replaces the bgpBackwardsTransition Notification.
NTF bgpEstablished	1.3.6.1.2.1.15.7.1			The bgpEstablished event is generated when the BGP FSM enters the established state. This Notification has been replaced by the bgpEstablishedNotification Notification.
NTF bgpEstablishedNotification	1.3.6.1.2.1.15.0.1			The bgpEstablishedNotification event is generated when the BGP FSM enters the established state. This Notification replaces the bgpEstablished Notification.
IP bgpIdentifier	1.3.6.1.2.1.15.4	IpAddress	read-only	The BGP Identifier of the local system.
I32 bgpLocalAs	1.3.6.1.2.1.15.2	Integer32	read-only	The local autonomous system number.
bgpNotification	1.3.6.1.2.1.15.0
OCT bgpPathAttrASPath	1.3.6.1.2.1.15.5.1.4	OCTET STRING	read-only	The set of ASes that must be traversed to reach the network. This object is probably best represented as SEQUENCE OF INTEGER. For SMI compatibility, though, it is represented as OCTET STRING. Each AS is represented as a pair of octets according to the following algorithm: first-byte-of-pair = ASNumber / 256; second-byte-of-pair = ASNumber & 255;
IP bgpPathAttrDestNetwork	1.3.6.1.2.1.15.5.1.2	IpAddress	read-only	The address of the destination network.
bgpPathAttrEntry	1.3.6.1.2.1.15.5.1		not-accessible	Information about a path to a network.
I32 bgpPathAttrInterASMetric	1.3.6.1.2.1.15.5.1.6	Integer32	read-only	The optional inter-AS metric. If this attribute has not been provided for this route, the value for this object is 0.
IP bgpPathAttrNextHop	1.3.6.1.2.1.15.5.1.5	IpAddress	read-only	The address of the border router that should be used for the destination network.
INT bgpPathAttrOrigin	1.3.6.1.2.1.15.5.1.3	INTEGER	read-only	The ultimate origin of the path information.
IP bgpPathAttrPeer	1.3.6.1.2.1.15.5.1.1	IpAddress	read-only	The IP address of the peer where the path information was learned.
INT bgpPeerAdminStatus	1.3.6.1.2.1.15.3.1.3	INTEGER	read-write	The desired state of the BGP connection. A transition from 'stop' to 'start' will cause the BGP Manual Start Event to be generated. A transition from 'start' to 'stop' will cause the BGP Manual Stop Event to be generated. This parameter can be used to restart BGP peer connections. Care should be used in providing write access to this object without adequate authentication.
I32 bgpPeerConnectRetryInterval	1.3.6.1.2.1.15.3.1.17	Integer32	read-write	Time interval (in seconds) for the ConnectRetry timer. The suggested value for this timer is 120 seconds.
bgpPeerEntry	1.3.6.1.2.1.15.3.1		not-accessible	Entry containing information about the connection with a BGP peer.
G32 bgpPeerFsmEstablishedTime	1.3.6.1.2.1.15.3.1.16	Gauge32	read-only	This timer indicates how long (in seconds) this peer has been in the established state or how long since this peer was last in the established state. It is set to zero when a new peer is configured or when the router is booted.
C32 bgpPeerFsmEstablishedTransitions	1.3.6.1.2.1.15.3.1.15	Counter32	read-only	The total number of times the BGP FSM transitioned into the established state for this peer.
I32 bgpPeerHoldTime	1.3.6.1.2.1.15.3.1.18	Integer32	read-only	Time interval (in seconds) for the Hold Timer established with the peer. The value of this object is calculated by this BGP speaker, using the smaller of the values in bgpPeerHoldTimeConfigured and the Hold Time received in the OPEN message. This value must be at least three seconds if it is not zero (0). If the Hold Timer has not been established with the peer this object MUST have a value of zero (0). If the bgpPeerHoldTimeConfigured object has a value of (0), then this object MUST have a value of (0).
I32 bgpPeerHoldTimeConfigured	1.3.6.1.2.1.15.3.1.20	Integer32	read-write	Time interval (in seconds) for the Hold Time configured for this BGP speaker with this peer. This value is placed in an OPEN message sent to this peer by this BGP speaker, and is compared with the Hold Time field in an OPEN message received from the peer when determining the Hold Time (bgpPeerHoldTime) with the peer. This value must not be less than three seconds if it is not zero (0). If it is zero (0), the Hold Time is NOT to be established with the peer. The suggested value for this timer is 90 seconds.
IP bgpPeerIdentifier	1.3.6.1.2.1.15.3.1.1	IpAddress	read-only	The BGP Identifier of this entry's BGP peer. This entry MUST be 0.0.0.0 unless the bgpPeerState is in the openconfirm or the established state.
C32 bgpPeerInTotalMessages	1.3.6.1.2.1.15.3.1.12	Counter32	read-only	The total number of messages received from the remote peer on this connection.
G32 bgpPeerInUpdateElapsedTime	1.3.6.1.2.1.15.3.1.24	Gauge32	read-only	Elapsed time (in seconds) since the last BGP UPDATE message was received from the peer. Each time bgpPeerInUpdates is incremented, the value of this object is set to zero (0).
C32 bgpPeerInUpdates	1.3.6.1.2.1.15.3.1.10	Counter32	read-only	The number of BGP UPDATE messages received on this connection.
I32 bgpPeerKeepAlive	1.3.6.1.2.1.15.3.1.19	Integer32	read-only	Time interval (in seconds) for the KeepAlive timer established with the peer. The value of this object is calculated by this BGP speaker such that, when compared with bgpPeerHoldTime, it has the same proportion that bgpPeerKeepAliveConfigured has, compared with bgpPeerHoldTimeConfigured. If the KeepAlive timer has not been established with the peer, this object MUST have a value of zero (0). If the of bgpPeerKeepAliveConfigured object has a value of (0), then this object MUST have a value of (0).
I32 bgpPeerKeepAliveConfigured	1.3.6.1.2.1.15.3.1.21	Integer32	read-write	Time interval (in seconds) for the KeepAlive timer configured for this BGP speaker with this peer. The value of this object will only determine the KEEPALIVE messages' frequency relative to the value specified in bgpPeerHoldTimeConfigured; the actual time interval for the KEEPALIVE messages is indicated by bgpPeerKeepAlive. A reasonable maximum value for this timer would be one third of that of bgpPeerHoldTimeConfigured. If the value of this object is zero (0), no periodical KEEPALIVE messages are sent to the peer after the BGP connection has been established. The suggested value for this timer is 30 seconds.
OCT bgpPeerLastError	1.3.6.1.2.1.15.3.1.14	OCTET STRING	read-only	The last error code and subcode seen by this peer on this connection. If no error has occurred, this field is zero. Otherwise, the first byte of this two byte OCTET STRING contains the error code, and the second byte contains the subcode.
IP bgpPeerLocalAddr	1.3.6.1.2.1.15.3.1.5	IpAddress	read-only	The local IP address of this entry's BGP connection.
I32 bgpPeerLocalPort	1.3.6.1.2.1.15.3.1.6	Integer32	read-only	The local port for the TCP connection between the BGP peers.
I32 bgpPeerMinASOriginationInterval	1.3.6.1.2.1.15.3.1.22	Integer32	read-write	Time interval (in seconds) for the MinASOriginationInterval timer. The suggested value for this timer is 15 seconds.
I32 bgpPeerMinRouteAdvertisementInterval	1.3.6.1.2.1.15.3.1.23	Integer32	read-write	Time interval (in seconds) for the MinRouteAdvertisementInterval timer. The suggested value for this timer is 30 seconds for EBGP connections and 5 seconds for IBGP connections.
I32 bgpPeerNegotiatedVersion	1.3.6.1.2.1.15.3.1.4	Integer32	read-only	The negotiated version of BGP running between the two peers. This entry MUST be zero (0) unless the bgpPeerState is in the openconfirm or the established state. Note that legal values for this object are between 0 and 255.
C32 bgpPeerOutTotalMessages	1.3.6.1.2.1.15.3.1.13	Counter32	read-only	The total number of messages transmitted to the remote peer on this connection.
C32 bgpPeerOutUpdates	1.3.6.1.2.1.15.3.1.11	Counter32	read-only	The number of BGP UPDATE messages transmitted on this connection.
IP bgpPeerRemoteAddr	1.3.6.1.2.1.15.3.1.7	IpAddress	read-only	The remote IP address of this entry's BGP peer.
I32 bgpPeerRemoteAs	1.3.6.1.2.1.15.3.1.9	Integer32	read-only	The remote autonomous system number received in the BGP OPEN message.
I32 bgpPeerRemotePort	1.3.6.1.2.1.15.3.1.8	Integer32	read-only	The remote port for the TCP connection between the BGP peers. Note that the objects bgpPeerLocalAddr, bgpPeerLocalPort, bgpPeerRemoteAddr, and bgpPeerRemotePort provide the appropriate reference to the standard MIB TCP connection table.
INT bgpPeerState	1.3.6.1.2.1.15.3.1.2	INTEGER	read-only	The BGP peer connection state.
bgpPeerTable	1.3.6.1.2.1.15.3		not-accessible	BGP peer table. This table contains, one entry per BGP peer, information about the connections with BGP peers.
bgpRcvdPathAttrGroup	1.3.6.1.2.1.15.8.2.3			A collection of objects for managing BGP-3 and earlier path entries. This conformance group, like BGP-3, is obsolete.
bgpRcvdPathAttrTable	1.3.6.1.2.1.15.5		not-accessible	The BGP Received Path Attribute Table contains information about paths to destination networks, received from all peers running BGP version 3 or less.
bgpTraps	1.3.6.1.2.1.15.7
OCT bgpVersion	1.3.6.1.2.1.15.1	OCTET STRING	read-only	Vector of supported BGP protocol version numbers. Each peer negotiates the version from this vector. Versions are identified via the string of bits contained within this object. The first octet contains bits 0 to 7, the second octet contains bits 8 to 15, and so on, with the most significant bit referring to the lowest bit number in the octet (e.g., the MSB of the first octet refers to bit 0). If a bit, i, is present and set, then the version (i+1) of the BGP is supported.

RFC description

RFC 1657 standard MIB for managing Border Gateway Protocol version 4 (BGP4); defines objects for BGP routing protocol state, statistics, and configuration.

Start monitoring BGP-speaking routers with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download BGP4-MIB

What Is BGP4-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description