HP 5920 Series Troubleshooting Guide

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Troubleshooting flowchart
Figure 15 Troubleshooting Layer 3 forwarding failure
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 "Layer 2 forwarding failure" to troubleshoot the problem.
2. Verify that ARP entries are correct:
a. Execute the di
splay arp command to verify that ARP entries are correct.
− 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.
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.
b. Execute the display fib command to verify that the output interfaces in the FIB entries and route
entries are the same.
The port is faulty?
ARP entries are correct?
Troubleshoot the port Resolved?
Troubleshoot ARP
entries
Contact HP Support
Layer 3 packet loss
Yes
No No
Yes
Resolved?
No Yes
Yes No
End
Route entries are correct?
Troubleshoot route
entries
Resolved?
No Yes
Yes No

HP 5920 Series Specifications

General

Brand	HP
Model	5920 Series
Category	Switch
Language	English