CCNP TSHOOT 6.0 - Cisco Learning Home

CCNPv6 TSHOOT
establishment of the BGP peering. If one of the peers
decides to close the session because of a parameter
problem, such as a mismatched AS number or an
invalid router ID, the debug also displays information
about the cause.
clear ip bgp * Clears the contents of the BGP table.
show ip bgp network mask longer
prefixes
show ip bgp neighbor ip-address
routes
show ip bgp neighbor ip-address
advertised-routes
show ip bgp regexp regularexpression
Lab 5-3: Sample Troubleshooting Flows
Displays more specific prefixes present in the BGP
table (including the prefix itself) that are contained in
the prefix specified by the network and mask
options.
Displays all routes in the BGP table that were
received from the neighbor specified by the ipaddress
option.
Displays all routes in the BGP table that will be
advertised to the neighbor specified by the ipaddress
option.
Displays all routes from the BGP table that have an
AS path string that is matched by the specified
regular expression.
The figure illustrates an example of a method that you could follow to diagnose and resolve problems related to
BGP.
Sample BGP Troubleshooting Flow
Layer 3
problem
caused by
routing
protocol
failure
Verify routing table
and FIB
Verify
neighbor
availability
Verify route
availability
Verify route
selection
© 2009 Cisco Systems, Inc. All rights reserved. TSHOOT v1.0—93
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