Troubleshooting guide

Troubleshooting

Show Commands

Show IP AS-Path List

Use the show ip as-path-list command to display any AS path lists that have been configured in the router,

along with any permit and deny clauses in each list.

#show ip as-path-list <name>

<name> Optional. Specifies that the command display only the list matching the specified AS path list

name. If not specified, all AS path lists are displayed.

In the following example, all AS path lists defined in the router are displayed:

#show ip as-path-list

ip as-path-list AsPathList1:

permit 100

permit 200

permit 300

deny 6500

ip as-path-list ASPathList2:

permit 400

permit 500

In the following example, only the AS path list with the name AsPathList2 is displayed:

#show ip as-path-list AsPathList2

ip as-path-list AsPathList2:

permit 400

permit 500

Show IP BGP

Use the show ip bgp command to display details about the specified route, including the advertising router

IPv4 address, router ID, and the list of neighbors to which this router is being advertised.

#show ip bgp <ipv4 address> <subnet mask>

<ipv4v address> Optional. Specifies a valid IPv4 address. IPv4 addresses should be expressed in dotted

decimal notation (for example, 10.10.10.1).

<subnet mask> Optional. Specifies the subnet mask that corresponds to a range of IPv4 addresses

(network) or a specific host. Subnet masks can be expressed in dotted decimal notation (for example,

255.255.255.0) or as a prefix length (for example, /24).

The following example shows detailed output of the show ip bgp command:

#show ip bgp

BGP local router ID is 172.16.70.1, local AS is 501.

Status codes: * valid, > best, i - internal, o - local

Origin codes: i - IGP, e - EGP, ? - incomplete

Network NextHop Metric LocPrf Path

*> 172.16.55.0/30 10.100.13.151 500 i

*>o172.16.70.0/30 0.0.0.0 i

Total RIB entries = 2