Troubleshooting guide

Troubleshooting

#show ip bgp neighbors

<ipv4 address> re

ceived-routes

Displays all IPv4 routes (accepted and rejected) advertised by

e specified neighbor.

#show ip bg

p neighbors

<ipv4 address> routes

Displays all accepted received IPv4 routes advertised by the

specified neighbor. Routes displayed have passed inbound

filtering.

#show ip bg

p regexp <expression> Displays a summary of the BGP route table that includes routes

whose AS path matches the specified expression.

#show running-config router bgp Displays only the BGP configuration of the router.

Table 12. Viewing BGP Messages

#debu

g ip bgp Displays general BGP events, such as sent/received message

summaries, route processing actions, and results. Keepalive

packets are not debugged with this command.

#debu

g ip bgp events Displays significant BGP events, such as neighbor state

changes.

#debu

g ip bgp [in | out] Displays the same information as debug ip bgp, but limits

messages to the specified direction.

#debu

g ip bgp keepalives Displays BGP keepalive packets.

#debu

g ip bgp updates [quiet] Displays detailed information on BGP updates for all

neighbors. The optional quiet keyword displays a one-line

summary with information about BGP neighbor updates.

The output of all show commands can be limited by appending the following modifiers to

the end of the command: | begin <text>, | exclude <text>, and | include <text>. The

include modifier limits output to lines that contain the specified text, the exclude modifier

excludes any lines with the specified text, and the begin modifier displays the first line of

output with the specified text and all lines thereafter.

Command Description

The bgp log-neighbor-changes command can be issued to log state changes of a BGP

neighbor. Refer to Log Neighbor Changes on page 19 for more information.

Table 11. Viewing BGP Information (Continued)

Command Description