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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 the routing table.
display mac
-
address
Displays MAC address entries
Protocol flapping
Symptom
The switch cannot send or receive protocol packets.
Troubleshooting flowchart
Figure 22 Troubleshooting protocol flapping
Solution
To resolve the issue:
1. Verify that Layer 2 is operating correctly, as described in "Layer 2 forwarding failure."
2. Verify that Layer 3 is ope
rating correctly, as described in "Layer 3 forwarding failure."
Layer 2 packet loss occurs?
Layer 3 packet loss occurs?
Troubleshoot the
problem
Resolved?
Troubleshoot the
problem
Contact the support
Layer 3 protocol flapping
Yes
No No
Yes
Resolved?
Yes Yes
No No
End
Software-related
packet loss occurs?
No
Yes
Collect diagnostic
information
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