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Troubleshooting flowchart
Figure 22 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 for gateways are correct:
a.
Execute the
display arp
command to verify that the ARP entries are correct.
−
If incorrect ARP entries exist, execute the
debugging arp packet
command to locate
the problem.
−
If no ARP entries are learned, 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.
If the output interfaces are different, execute the
reset
arp
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.
If the output interfaces are different, execute the
reset
command to clear the route entries.
Then the switch can learn route entries again.
4.
If the problem persists, contact H3C Support.
