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Configuring BGP4
The TCP statistics at the end of the display show status for the TCP session with the neighbor. Most of the fields
show information stored in the routing switch’s Transmission Control Block (TCB) for the TCP session between
the routing switch and its neighbor. These fields are described in detail in section 3.2 of RFC 793, “Transmission
Control Protocol Functional Specification”.
In this example, a specific neighbor’s IP address is entered. The command therefore shows information only for
that neighbor. None of the other options are used; thus, all the information about the neighbor is displayed. The
numbers in the leftmost column separate the entries for each neighbor.
Syntax: show ip bgp neighbors [<ip-addr> [advertised-routes [detail [<ip-addr>[/<mask-bits>]]]] | [attribute-entries
[detail]] | [flap-statistics] | [last-packet-with-error] |
[received-routes [best] | [detail [best] | [not-installed-best] | [unreachable]] |
[rib-out-routes [<ip-addr>/<mask-bits> | <ip-addr> <net-mask> | detail]] | [routes-summary]]
The <ip-addr> option lets you narrow the scope of the command to a specific neighbor.
The advertised-routes option displays only the routes that the routing switch has advertised to the neighbor
during the current BGP4 neighbor session.
The attribute-entries option shows the attribute-entries associated with routes received from the neighbor.
The flap-statistics option shows the route flap statistics for routes received from or sent to the neighbor.
The last-packet-with-error displays a hexadecimal dump of the first 400 bytes of the last packet received from
the neighbor that contained an error.
The received-routes option lists the routes received in UPDATE messages from the neighbor. You can specify
the following additional options:
• best – Displays the routes received from the neighbor that the routing switch selected as the best routes to
their destinations.
• not-installed-best – Displays the routes received from the neighbor that are the best BGP4 routes to their
destinations, but were nonetheless not installed in the IP route table because the routing switch received
better routes from other sources (such as OSPF, RIP, or static IP routes).
• unreachable – Displays the routes that are unreachable because the routing switch does not have a valid
RIP, OSPF, or static route to the next hop.
• detail – Displays detailed information for the specified routes. You can refine your information request by
also specifying one of the options above (best, not-installed-best, or unreachable).
The rib-out-routes option lists the route information base (RIB) for outbound routes. You can display all the
routes or specify a network address.
The routes-summary option displays a summary of the following information:
• Number of routes received from the neighbor
• Number of routes accepted by this routing switch from the neighbor
• Number of routes this routing switch filtered out of the UPDATES received from the neighbor and did not
accept
• Number of routes advertised to the neighbor
• Number of attribute entries associated with routes received from or advertised to the neighbor.
This display shows the following information.
Table 10.6: BGP4 Neighbor Information
This Field... Displays...
IP Address The IP address of the neighbor.
AS# The AS the neighbor is in.
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