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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 "
" to troubleshoot the problem.
2.
Verify that ARP entries are correct:
a.
Execute the
display 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.
If the output interfaces are not the same, 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.
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 brief information about active routes in the routing
table.
display mac-address
Displays MAC address entries.
Protocol flapping
Symptom
The switch cannot send or receive protocol packets.