CCNP TSHOOT 6.0 - Cisco Learning Home

CCNPv6 TSHOOT
Sample Route Redistribution
Troubleshooting Flow
Layer 3
problem
caused by
missing
routes
Layer 3
problem
caused by
suboptimal
or incorrect
routes
Verify route
selection and
installation
Verify route
selection and
installation
Verify route
redistribution
Locate
source of
incorrect
information
Verify route
propagation
Filter or
manipulate
redistributed
routes
© 2009 Cisco Systems, Inc. All rights reserved. TSHOOT v1.0—84
When do you start troubleshooting route redistribution?
There are two major reasons to start troubleshooting the route redistribution. The first reason is when you are
experiencing IP connectivity problems in an environment in which information from a specific routing domain is
redistributed into a different routing domain and the connectivity problem is caused by a route from the source
routing domain that is not available on one or more of the routers participating in the destination routing domain.
In this scenario, the cause of the problem is that the exchange of routing information between the source routing
domain and the destination routing domain is not working correctly.
Note: In this section, the terms source and destination are used to indicate the source and destination of the
routing information, not the source and destination of a traffic flow.
The second reason to start troubleshooting route redistribution is if you are experiencing IP connectivity problems
caused by the use of incorrect routing information by some of the routers in a network that use route
redistribution. This behavior could be caused by routing information feedback or improper route selection.
Sample troubleshooting flows for each of these scenarios are provided in this section.
All contents are Copyright © 1992–2010 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 32 of 39