Monitoring BGP Neighbors

Purpose

Display information about BGP neighbors.

The show ip bgp neighbors and show bgp ipv6 neighbors commands display similar information.

Action

To display information about BGP neighbors:

Meaning

Table 35 lists the show ip bgp neighbors command output fields.

Table 35: show ip bgp neighbors Output Fields

Field Name

Field Description

BGP neighbor ID

BGP identifier of the BGP neighbor

remote AS

Remote AS of the BGP neighbor

Description

Textual description of the BGP neighbor

Member of peer group

Name of the peer group of which this BGP neighbor is a member

Remote router ID

Router ID of the remote router

negotiated BGP version

BGP version being used to communicate with the neighbor

Administrative status

Desired state of the peer connection

Connection state

Current state of the BGP connection

Connection has been established

Time that TCP connection was established

Reason for last reset

Reason for last reset of the BGP session

TCP error code

TCP connection error type

Default originate

Status of default originate (enabled or disabled)

EBGP multi-hop

Status of EBGP multihop (enabled or disabled)

IBGP single-hop

Status of IBGP single hop (enabled or disabled)

Next hop self

Status of next-hop self (enabled or disabled)

Route reflector status

Identifies the neighbor as a route-reflector client

Neighbor weight

Weight of routes from the BGP neighbor

Incoming update distribute list

Distribute list for incoming routes, if configured

Outgoing update distribute list

Distribute list for outgoing routes, if configured

Incoming update filter list

Update filter list for incoming routes, if configured

Outgoing update filter list

Update filter list for outgoing route, if configured

Weight filter list

Weight filter list for routes, if configured

Incoming route map

Incoming route map, if configured

Outgoing route map

Outgoing route map, if configured

Connect retry interval

Time between a BGP peer’s attempts to reestablish a connection to the neighbor

Minimum route advertisement interval

Minimum time between route advertisements

Minimum AS origination interval

Minimum time between advertisement of changes within the speaker’s AS

Configured keep-alive interval

Frequency of keep-alive messages generated

Negotiated keepalive interval

Negotiated frequency of keep-alive messages generated

Configured hold time

Configured maximum time allowed between received messages

Negotiated hold time

Negotiated maximum time allowed between received messages

Configured update source IP address

IP address used when sending update messages

Local IP address

Local IP address used for TCP communication to this peer

Local port

Local TCP port number used for TCP communication to this peer

Remote IP address

Remote IP address used for TCP communication to this peer

Remote port

Remote IP address used for TCP communication to this peer

Total messages sent

Total BGP messages sent to this neighbor

Total messages received

Total BGP messages received from this neighbor

Total update messages sent

Total BGP update messages sent to this neighbor

Total update messages received

Total BGP update messages received from this neighbor

Time since last update message was received

Time since last BGP update message was received from this neighbor

Address Family dependent capabilities

Lists type of ORF send and receive capability per address family and whether it is advertised (configured) or received

Maximum number of ORF entries

Limit of ORF entries that will be accepted from the neighbor

Capability advertisement

Lists whether the specific capability (capabilities option, deprecated dynamic capability negotiation, dynamic capability negotiation, multiprotocol extensions, route refresh, route refresh (Cisco proprietary), four octet AS numbers, and graceful restart) has been sent, received, or both

Multi-protocol extensions negotiation

Lists the relevant address family and whether it has been sent, received, or used

BFD

Status of BFD configuration, enabled, enabled but not supported because the peer is an IBGP neighbor a multihop EBGP neighbor, or disabled

BFD session

Type and address of peer to which BFD session is established

Minimum transmit interval

Desired interval between BFD packets transmitted to members of peer group

Minimum receive interval

Desired interval between BFD packets received from members of peer group

Multiplier

Number of BFD packets that can be missed before declaring BFD session down

Negotiated detection time

Interval between BFD packets negotiated by peers

Advertise-map

Name of route map that specifies routes to be advertised when routes in conditional route maps are matched

Condition-map

Name of route map that specifies routes to be matched by routes in the BGP routing table

Sequence

Position of the specified advertise route map in a list of advertise route maps configured for a particular peer within the same address-family. A lower sequence number has a higher priority; that route map is processed before one with a higher sequence number.

Status

Status of the routes specified by the route map, advertise (route map condition has been met) or withdraw (route map condition has not been met; regardless of this status, the specified routes might be governed by another route map with a lower sequence number and actually advertised or not according to that map

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