MLS troubleshooting requires troubleshooting at both the control and data planes. The control plane troubleshooting is the same as that performed on routers. MLS troubleshooting should follow a systematic approach, which involves checking the control plane, i.e. routing information, and then verifying the data or forwarding plane information. The following basic steps should be taken when troubleshooting Unicast Multilayer switching issues:
- Verify that IP routing information for the address is correct
- Verify that the next hop has a valid MAC address
- Verify that the FIB next hop is the same as the RIB . . .
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