Mismatched Subnet Numbers (Step 6)

At this point, if the problems found in the first five of the six troubleshooting steps have been resolved, all the Frame Relay problems should be resolved. However, if the two routers on either end of the PVC have mistakenly configured IP addresses in different subnets, the routers will not be able to ping one another, and the routing protocols will not become adjacent. So, as a last step, you should confirm the IP addresses on each router and the masks and ensure that they connect to the same subnet. To do so, just use the show ip interface brief and show interfaces commands on the two routers.

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