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BGP neighbor
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IP address of the BGP neighbor and its autonomous system number.
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remote AS
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Autonomous system number of the neighbor.
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local AS 300 no-prepend (not shown in display)
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Verifies that the local autonomous system number is not prepended to received external routes. This output supports the hiding
of the local autonomous systems when a network administrator is migrating autonomous systems.
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internal link
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“internal link” is displayed for iBGP neighbors; “external link” is displayed for external BGP (eBGP) neighbors.
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BGP version
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BGP version being used to communicate with the remote router.
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remote router ID
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IP address of the neighbor.
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BGP state
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Finite state machine (FSM) stage of session negotiation.
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up for
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Time, in hh:mm:ss, that the underlying TCP connection has been in existence.
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Last read
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Time, in hh:mm:ss, since BGP last received a message from this neighbor.
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last write
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Time, in hh:mm:ss, since BGP last sent a message to this neighbor.
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hold time
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Time, in seconds, that BGP will maintain the session with this neighbor without receiving messages.
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keepalive interval
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Time interval, in seconds, at which keepalive messages are transmitted to this neighbor.
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Neighbor capabilities
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BGP capabilities advertised and received from this neighbor. “advertised and received” is displayed when a capability is
successfully exchanged between two routers.
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Route refresh
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Status of the route refresh capability.
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MPLS Label capability
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Indicates that MPLS labels are both sent and received by the eBGP peer.
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Graceful Restart Capability
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Status of the graceful restart capability.
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Address family IPv4 Unicast
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IP Version 4 unicast-specific properties of this neighbor.
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Message statistics
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Statistics organized by message type.
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InQ depth is
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Number of messages in the input queue.
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OutQ depth is
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Number of messages in the output queue.
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Sent
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Total number of transmitted messages.
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Revd
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Total number of received messages.
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Opens
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Number of open messages sent and received.
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Notifications
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Number of notification (error) messages sent and received.
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Updates
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Number of update messages sent and received.
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Keepalives
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Number of keepalive messages sent and received.
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Route Refresh
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Number of route refresh request messages sent and received.
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Total
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Total number of messages sent and received.
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Default minimum time between...
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Time, in seconds, between advertisement transmissions.
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For address family:
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Address family to which the following fields refer.
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BGP table version
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Internal version number of the table. This is the primary routing table with which the neighbor has been updated. The number
increments when the table changes.
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neighbor version
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Number used by the software to track prefixes that have been sent and those that need to be sent.
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1 update-group member
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Number of the update-group member for this address family.
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Prefix activity
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Prefix statistics for this address family.
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Prefixes Current
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Number of prefixes accepted for this address family.
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Prefixes Total
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Total number of received prefixes.
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Implicit Withdraw
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Number of times that a prefix has been withdrawn and readvertised.
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Explicit Withdraw
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Number of times that a prefix has been withdrawn because it is no longer feasible.
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Used as bestpath
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Number of received prefixes installed as best paths.
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Used as multipath
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Number of received prefixes installed as multipaths.
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* Saved (soft-reconfig)
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Number of soft resets performed with a neighbor that supports soft reconfiguration. This field is displayed only if the counter
has a nonzero value.
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* History paths
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This field is displayed only if the counter has a nonzero value.
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* Invalid paths
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Number of invalid paths. This field is displayed only if the counter has a nonzero value.
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Local Policy Denied Prefixes
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Prefixes denied due to local policy configuration. Counters are updated for inbound and outbound policy denials. The fields
under this heading are displayed only if the counter has a nonzero value.
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* route-map
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Displays inbound and outbound route-map policy denials.
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* filter-list
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Displays inbound and outbound filter-list policy denials.
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* prefix-list
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Displays inbound and outbound prefix-list policy denials.
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* Ext Community
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Displays only outbound extended community policy denials.
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* AS_PATH too long
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Displays outbound AS_PATH length policy denials.
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* AS_PATH loop
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Displays outbound AS_PATH loop policy denials.
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* AS_PATH confed info
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Displays outbound confederation policy denials.
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* AS_PATH contains AS 0
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Displays outbound denials of autonomous system 0.
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* NEXT_HOP Martian
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Displays outbound martian denials.
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* NEXT_HOP non-local
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Displays outbound nonlocal next-hop denials.
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* NEXT_HOP is us
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Displays outbound next-hop-self denials.
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* CLUSTER_LIST loop
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Displays outbound cluster-list loop denials.
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* ORIGINATOR loop
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Displays outbound denials of local originated routes.
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* unsuppress-map
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Displays inbound denials due to an unsuppress map.
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* advertise-map
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Displays inbound denials due to an advertise map.
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* VPN Imported prefix
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Displays inbound denials of VPN prefixes.
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* Well-known Community
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Displays inbound denials of well-known communities.
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* SOO loop
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Displays inbound denials due to site-of-origin.
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* Bestpath from this peer
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Displays inbound denials because the best path came from the local router.
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* Suppressed due to dampening
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Displays inbound denials because the neighbor or link is in a dampening state.
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* Bestpath from iBGP peer
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Deploys inbound denials because the best path came from an iBGP neighbor.
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* Incorrect RIB for CE
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Deploys inbound denials due to RIB errors for a customer edge (CE) router.
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* BGP distribute-list
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Displays inbound denials due to a distribute list.
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Number of NLRIs...
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Number of network layer reachability attributes in updates.
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Current session network count peaked...
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Displays the peak number of networks observed in the current session.
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Highest network count observed at...
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Displays the peak number of networks observed since startup.
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Connections established
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Number of times a TCP and BGP connection has been successfully established.
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dropped
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Number of times that a valid session has failed or been taken down.
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Last reset
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Time, in hh:mm:ss, since this peering session was last reset. The reason for the reset is displayed on this line.
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External BGP neighbor may be...
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Indicates that the BGP time to live (TTL) security check is enabled. The maximum number of hops that can separate the local
and remote peer is displayed on this line.
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Connection state
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Connection status of the BGP peer.
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unread input bytes
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Number of bytes of packets still to be processed.
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Connection is ECN Disabled
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Explicit congestion notification status (enabled or disabled).
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Local host: 10.108.50.1, Local port: 179
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IP address of the local BGP speaker. BGP port number 179.
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Foreign host: 10.108.50.2, Foreign port: 42698
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Neighbor address and BGP destination port number.
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Enqueued packets for retransmit:
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Packets queued for retransmission by TCP.
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Event Timers
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TCP event timers. Counters are provided for starts and wakeups (expired timers).
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Retrans
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Number of times a packet has been retransmitted.
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TimeWait
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Time waiting for the retransmission timers to expire.
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AckHold
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Acknowledgment hold timer.
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SendWnd
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Transmission (send) window.
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KeepAlive
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Number of keepalive packets.
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GiveUp
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Number of times a packet is dropped due to no acknowledgment.
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PmtuAger
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Path MTU discovery timer.
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DeadWait
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Expiration timer for dead segments.
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iss:
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Initial packet transmission sequence number.
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snduna:
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Last transmission sequence number that has not been acknowledged.
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sndnxt:
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Next packet sequence number to be transmitted.
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sndwnd:
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TCP window size of the remote neighbor.
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irs:
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Initial packet receive sequence number.
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rcvnxt:
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Last receive sequence number that has been locally acknowledged.
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rcvwnd:
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TCP window size of the local host.
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delrcvwnd:
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Delayed receive window—data the local host has read from the connection, but has not yet subtracted from the receive window
the host has advertised to the remote host. The value in this field gradually increases until it is higher than a full-sized
packet, at which point it is applied to the rcvwnd field.
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SRTT:
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A calculated smoothed round-trip timeout.
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RTTO:
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Round-trip timeout.
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RTV:
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Variance of the round-trip time.
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KRTT:
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New round-trip timeout (using the Karn algorithm). This field separately tracks the round-trip time of packets that have
been re-sent.
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minRTT:
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Shortest recorded round-trip timeout (hard-wire value used for calculation).
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maxRTT:
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Longest recorded round-trip timeout.
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ACK hold:
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Length of time the local host will delay an acknowledgment to carry (piggyback) additional data.
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IP Precedence value:
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IP precedence of the BGP packets.
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Datagrams
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Number of update packets received from a neighbor.
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Rcvd:
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Number of received packets.
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out of order:
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Number of packets received out of sequence.
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with data
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Number of update packets sent with data.
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total data bytes
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Total amount of data received, in bytes.
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Sent
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Number of update packets sent.
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Second Congestion
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Number of update packets with data sent.
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Datagrams: Rcvd
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Number of update packets received from a neighbor.
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retransmit
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Number of packets retransmitted.
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fastretransmit
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Number of duplicate acknowledgments retransmitted for an out of order segment before the retransmission timer expires.
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partialack
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Number of retransmissions for partial acknowledgments (transmissions before or without subsequent acknowledgments).
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Second Congestion
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Number of second retransmissions sent due to congestion.
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