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Flags: higher precedence, nagle
Datagrams (max data segment is 1460 bytes):
Rcvd: 15 (out of order: 0), with data: 12, total data bytes: 291
Sent: 23 (retransmit: 0), with data: 11, total data bytes: 276
Table 46 describes the fields shown in the display.
Table 46 show ip bgp neighbors Field Descriptions
Field Description
BGP neighbor IP address of the BGP neighbor and its autonomous system number.
If the neighbor is in the same autonomous system as the router, then
the link between them is internal; otherwise, it is considered external.
BGP version BGP version being used to communicate with the remote router; the
neighbor s router ID (an IP address) is also specified.
BGP state Internal state of this BGP connection.
table version Indicates that the neighbor has been updated with this version of the
primary BGP routing table.
up for Amount of time that the underlying TCP connection has been in
existence.
Network Protocols Command Reference, Part 1
P1R-471
BGP Commands
show ip bgp neighbors
Table 46 show ip bgp neighbors Field Descriptions (continued)
Field Description
Last read Time that BGP last read a message from this neighbor.
hold time Maximum amount of time that can elapse between messages from the
peer.
keepalive interval Time period between sending keepalive packets, which help ensure
that the TCP connection is up.
Received Number of total BGP messages received from this peer, including
keepalives.
notifications Number of error messages received from the peer.
Sent Total number of BGP messages that have been sent to this peer,
including keepalives.
notifications Number of error messages the router has sent to this peer.
Connections Number of times the router has established a TCP connection and the
established two peers have agreed speak BGP with each other.
dropped Number of times that a good connection has failed or been taken
down.
Connection state State of BGP peer.
unread input bytes Number of bytes of packets still to be processed.
Local host, Local port Peering address of local router, plus port.
Foreign host, Foreign Neighbor s peering address.
port
Event Timers Table displays the number of starts and wakeups for each timer.
iss Initial send sequence number.
snduna Last send sequence number the local host sent but has not received an
acknowledgment for.
sndnxt Sequence number the local host will send next.
sndwnd TCP window size of the remote host.
irs Initial receive sequence number.
rcvnxt Last receive sequence number the local host has acknowledged.
rcvwnd Local host s TCP window size.
delrecvwnd 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.
SRTT A calculated smoothed round-trip timeout.
RTTO Round-trip timeout.
RTV Variance of the round-trip time.
KRTT New round-trip timeout (using the Karn algorithm). This field
separately tracks the round-trip time of packets that have been
retransmitted.
Network Protocols Command Reference, Part 1
P1R-472
BGP Commands
show ip bgp neighbors
Table 46 show ip bgp neighbors Field Descriptions (continued)
Field Description
minRTT Smallest recorded round-trip timeout (hard wire value used for
calculation).
maxRTT Largest recorded round-trip timeout.
ACK hold Time the local host will delay an acknowledgment in order to
piggyback data on it.
Flags IP precedence of the BGP packets.
Datagrams: Rcvd Number of update packets received from neighbor.
with data Number of update packets received with data.
total data bytes Total bytes of data.
Sent Number of update packets sent.
with data Number of update packets with data sent.
total data bytes Total number of data bytes.
The following is sample output from the show ip bgp neighbors command with advertised-routes:
Router# show ip bgp neighbors 172.16.232.178 advertised-routes
BGP table version is 27, local router ID is 172.16.232.181
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i110.0.0.0 172.16.232.179 0 100 0 ?
*> 200.2.2.0 0.0.0.0 0 32768 i
The following is sample output from the show ip bgp neighbors command with routes:
Router# show ip bgp neighbors 172.16.232.178 routes
BGP table version is 27, local router ID is 172.16.232.181
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.0.0.0 172.16.232.178 40 0 10 ?
*> 10.2.0.0 172.16.232.178 40 0 10 ?
Table 47 describes the fields shown in the display.
Table 47 show ip bgp neighbors Advertised-Routes and Routes Field Descriptions
Field Description
BGP table version Internal version number of the table. This number is incremented
whenever the table changes.
local router ID IP address of the router.
Network Protocols Command Reference, Part 1
P1R-473
BGP Commands
show ip bgp neighbors
Table 47 show ip bgp neighbors Advertised-Routes and Routes Field Descriptions (continued)
Field Description
Status codes s The table entry is suppressed.
* The table entry is valid.
> The table entry is the best entry to use for that network.
i The table entry was learned via an internal BGP session.
Origin codes Indicates the origin of the entry. The origin code is placed at the end
of each line in the table. It can be one of the following values:
i Entry originated from IGP and was advertised with a network
router configuration command.
e Entry originated from EGP.
? Origin of the path is not clear Usually, this is a router that is
redistributed into BGP from an IGP.
Network IP address of a network entity.
Next Hop IP address of the next system that is used when forwarding a packet to
the destination network. An entry of 0.0.0.0 indicates that the router
has some non-BGP routes to this network.
Metric If shown, this is the value of the interautonomous system metric. This
field is frequently not used.
LocPrf Local preference value as set with the set local-preference route-map
configuration command. The default value is 100.
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