Other Quick Checks
After you have verified that the LSP between PE routers is broken, you should perform a few more quick MPLS-related checks before you go into in-depth MPLS troubleshooting:
Is CEF enabled globally on every router in the path?
You verify proper operation of CEF with the show ip cef summary monitoring command, which should produce a printout similar to the one shown in Example 9-4.
Example 9-4. Correct show ip cef summary Printout
Router#show ip cef summary IP CEF with switching (Table Version 87), flags=0x0 51 routes, 0 reresolve, 0 unresolved (0 old, 0 new) 54 leaves, 30 nodes, 37896 bytes, 90 inserts, 36 invalidations 0 load sharing elements, 0 bytes, 0 references universal per-destination load sharing algorithm, id E2D347E4 ...
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