Troubleshooting Flowchart; Solution - HP 5920 series Troubleshooting Manual

Troubleshooting flowchart

Figure 15 Troubleshooting Layer 3 forwarding failure
Layer 3 packet loss
The port is faulty?
ARP entries are correct?
Route entries are correct?
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Solution

To resolve the problem:
1. Verify that the port is not faulty (due to hardware or configuration problems).
If the port is faulty, follow the solution in
2. Verify that ARP entries are correct:
Execute the display arp command to verify that ARP entries are correct.
a.
−
−
b. Execute the display mac-address command to verify that the output interfaces in the MAC
address entries and ARP entries are the same by using the display mac-address command.
If the output interfaces are not the same, execute the reset command to clear the ARP entries.
Then the switch can learn ARP entries again.
3. Verify that route entries are correct:
a. Execute the display ip routing-table command to verify that route entries are correct.
If incorrect route entries exist, troubleshoot the protocol that learns the route entries.
Execute the display fib command to verify that the output interfaces in the FIB entries and route
b.
entries are the same.
Yes
No
No
Yes
No
Yes
If incorrect ARP entries exist, execute the debugging arp packet command to locate the
problem.
If the switch learns no ARP entries, you can execute the arp static command to configure
static ARP entries.
Troubleshoot the port
Troubleshoot ARP
entries
Troubleshoot route
entries
"Layer 2 forwarding
44
Yes
Resolved?
No
Yes
Resolved?
No
Yes
Resolved?
No
End
failure" to troubleshoot the problem.