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Troubleshooting flowchart
Figure 19 Troubleshooting Layer 3 forwarding failure
Solution
To resolve the issue:
1.
Verify that the port is not faulty (due to hardware or configuration issues).
If the port is faulty, follow the solution in "
" to troubleshoot the issue.
2.
Verify that ARP entries are correct if Layer 3 forwarding is based on IPv4:
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 issue.
−
If the switch learns no ARP entries, 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 ND entries are correct if Layer 3 forwarding is based on IPv6:
a.
Execute the
display ipv6 neighbors
command to verify that ND entries are correct.
−
If incorrect ND entries exist, execute the
debugging ipv6 icmp
command to locate the
issue.
−
If the switch learns no ND entries, execute the
ipv6 neighbor
command to configure
static ND entries.
b.
Execute the
display mac-address
command to verify that the output interfaces in the MAC
address entries and ND entries are the same.
The port is faulty?
No
Yes
Yes
Troubleshoot the
port
End
Yes
No
Packet loss at Layer 3
ARP or ND entries
are correct?
Troubleshoot ARP
or ND entries
Route entries are correct?
Yes
Troubleshoot route
entries
No
Resolved?
No
No
No
Yes
Yes
Resolved?
Resolved?
Contact the support
