Troubleshooting Other Problems; Layer 2 Forwarding Failure; Symptom; Troubleshooting Flowchart - H3C s5800 series Troubleshooting Manual

Troubleshooting other problems

Layer 2 forwarding failure

Symptom

Layer 2 packet loss occurs between two devices on the same network segment and in the same VLAN.

Troubleshooting flowchart

Figure 5 Troubleshooting Layer 2 packet loss failure
Layer 2 packet loss
Incoming error packets?
Packets filtered by
ACLs or QoS policies?
Port blocked?
Port misconfigurations?
Port congestion?
Contact H3C Support
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Locate the
reasons of the
failure
Locate the
reasons and solve
the failure
Locate the
reasons and solve
the failure
Locate and modify
misconfigurations
Locate and solve
congestion
16
Yes
Resolved?
No
Yes
Resolved?
No
Yes
Resolved?
No
Yes
Resolved?
No
Yes
Resolved?
No
End