Related Commands; Protocol Flapping; Symptom; Troubleshooting Flowchart - H3C S5120V3-EI Series Troubleshooting Manual

Related commands

This section lists the commands that you might use for troubleshooting Layer 3 forwarding failure.
Command
debugging arp packet
display arp
display fib
display ip routing-table
display mac-address

Protocol flapping

Symptom

The switch cannot send or receive protocol packets.

Troubleshooting flowchart

Figure 9 Troubleshooting protocol flapping
Layer 3 protocol flapping
Layer 2 packet loss occurs?
Layer 3 packet loss occurs?
Software-related
packet loss occurs?
No
Contact H3C Support

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
Yes
No
Yes
No
Yes
Description
Enables ARP packet debugging.
Displays ARP entries.
Displays FIB entries.
Displays brief information about active routes in the routing
table.
Displays MAC address entries.
Troubleshoot the
problem
Troubleshoot the
problem
Collect diagnostic
information
"Layer 2 forwarding
"Layer 3 forwarding
30
Yes
Resolved?
No
Yes
Resolved?
No
End
failure."
failure."