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CCNPv6 TSHOOT
Sample Route Redistribution
Troubleshooting Flow
Layer 3
problem
caused by
missing
routes
Verify routing table
Verify route
selection and
installation
Verify route
redistribution
Verify route
propagation
© 2009 Cisco Systems, Inc. All rights reserved. TSHOOT v1.0—85
The first scenario in which you start troubleshooting route redistribution is when redistribution is configured and
you are troubleshooting connectivity problems to a network in the source routing domain from a router in the
destination routing domain. This type of problem is usually encountered during a generic IP connectivity
troubleshooting process when a route is discovered missing from the routing table on one of the routers in the
destination routing domain while the route is present in the routing tables of the routers in the source routing
domain.
Troubleshooting redistribution consists of troubleshooting four generic areas:
• Source routing protocol
• Route selection and installation
• Redistribution
• Destination protocol
In this scenario, the reason to start troubleshooting the redistribution is when the route is available in the source
routing domain but not in the destination routing domain. Therefore, the first step has already been taken at this
point. If the route is not available everywhere in the source routing domain to begin with, there is no reason to
start troubleshooting redistribution, but you should initiate a troubleshooting process for the source routing
protocol first.
Therefore, we will start at the second step: troubleshooting route selection and installation.
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