Users Guide
Version Description
9.4.(0.0) Added support for VRF.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.8.0 Added the add-path option to the S4810. Output on the S4810 shows the
ADDPATH parameters.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on the S-Series.
7.7.1.0 Introduced on the C-Series.
7.5.1.0 Added the detail option. Output now displays the default MED value.
7.2.1.0 Added the received and denied route options.
6.3.10 The output is changed to display the total number of advertised prexes.
Usage Information
After a peer reset, the contents of the notication log messages is displayed in hex values for debugging.
The neighbor information that this command displays does not include counts corresponding to ignored
prexes and updates. However, the martian case is an exception where neighbor information corresponding
to ignored updates is displayed.
BGP shows the exact information that is exchanged between the BGP peers. It also indicates whether or
not this information is received by the BGP peer.
The following describes the show ip bgp neighbors command shown in the following examples.
The Lines
Beginning with:
Description
BGP neighbor Displays the BGP neighbor address and its AS number. The last phrase in the line
indicates whether the link between the BGP router and its neighbor is an external
or internal one. If they are located in the same AS, the link is internal; otherwise the
link is external.
BGP version Displays the BGP version (always version 4) and the remote router ID.
BGP state Displays the neighbor’s BGP state and the amount of time in
hours:minutes:seconds it has been in that state.
Last read This line displays the following information:
• last read is the time (hours:minutes:seconds) the router read a message from
its neighbor
• hold time is the number of seconds congured between messages from its
neighbor
• keepalive interval is the number of seconds between keepalive messages to
help ensure that the TCP session is still alive.
Received messages This line displays the number of BGP messages received, the number of
notications (error messages), and the number of messages waiting in a queue for
processing.
426
Border Gateway Protocol