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Related commands
This section lists the commands that you might use for troubleshooting Layer 3 forwarding failure.
Command
Description
debugging arp packet
Enables ARP packet debugging.
display arp
Displays ARP entries.
display fib
Displays FIB entries.
display ip routing-table
Displays brief information about active routes in the routing
table.
display mac-address
Displays MAC address entries.
Protocol flapping
Symptom
The switch cannot send or receive protocol packets.
Troubleshooting flowchart
Figure 9 Troubleshooting protocol flapping
Solution
To resolve the issue:
1.
Verify that Layer 2 is operating correctly, as described in "
2.
Verify that Layer 3 is operating correctly, as described in "
