Chapter 7 MPLS VPN Solution Troubleshooting Guide
Auditing Problems
Figure
Also be sure to schedule data collection by choosing Monitoring > Collect VPN Routing
Information.
5.Question: I checked the “Use VPN routing info during audits” option, but I receive the message, “No VPN routing information found.”
Answer: You must collect VPN routing info to use it. Schedule data collection by choosing Monitoring > Collect VPN Routing Information.
6.Question: My service request is the Broken state. How do I address the problem?
Answer: While the router is correctly configured, the service is unavailable (due to a broken cable or Layer 2 problem, for example). A service request moves to Broken if the Auditor finds the routing and forwarding tables for this service, but they do not match the service intent.
There are three tests done for the routing test: 1) presence of routes toward the CE, 2) presence of routes away from the CE, and 3) if the CE is managed using the management VPN technique, routes to at least one of the CEs in the management VPN.
All these tests are done for the VRF in which the service request belongs. To test the presence of routes toward the CE, the product looks for a route toward the CE’s provider facing IP address.
The test for routes away from the CE looks for routes toward the “other side of the VPN.” This test checks the remote connectivity status If the service request is in a management VPN, the final test checks for a route to the management CE (MCE).
If any of the tests fail, the service request is set to Broken. Since this audit is from the routing information found on the PE, the routing test audit details are placed under the PE. Because the routing test is a Layer 3 operational test, the product cannot know why things have gone wrong at that
7.Question: I have a VPN with two CEs. One
Answer: The routing test checks whether the service request provides a routing level connection of the site to the VPN. For a VPN to exist, there must be at least two sites. Hence, in a VPN with two sites, if connectivity of one of the sites go down, the VPN no longer exists. Therefore, the
connectivity of the other site to the VPN also
8.Question: I just created a VPN and added my first site to it. I ran a VPN routing information collection operation and selected “Use VPN routing information.” Why does the service request move to Broken?
Answer: First read the answer to the previous question (Question 7).
Cisco VPN Solutions Center: MPLS Solution User Guide
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