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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 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 hhmmss, that the underlying TCP connection has been in
existence.
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Last read
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Time, in hhmmss, since BGP last received a message from this
neighbor.
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last write
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Time, in hhmmss, 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 a 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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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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Received
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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 number is incremented
whenever 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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update-group
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Number of 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 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 bestpaths.
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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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* 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 (AS) 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 non-local 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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* 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 bestpath 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 bestpath 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 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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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 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... (not shown in the display)
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Indicates that the BGP 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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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 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 larger 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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Smallest recorded round-trip timeout (hard-wire value used for
calculation).
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maxRTT:
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Largest 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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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 second retransmissions sent due to congestion.
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Datagrams: Rcvd
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Number of update packets received from a neighbor.
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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 received with data.
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Last reset
|
Elapsed time since this peering session was last reset.
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unread input bytes
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Number of bytes of packets still to be processed.
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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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