3Com Switch 8800 Family Configuration Guide

Troubleshooting VPLS 651
■ Expansion session is abnormal: verify that the commands used to configure the
expansion session are executed on both ends, and the configurations are all
right.
■ The interface of the private VLAN is not bound with the corresponding VPLS
instance, or is DOWN: make sure the interface is UP, or the PW to the UPE is UP.
■ The parameters for the peer or the MTU value of the VPLS instance is
inconsistent: verify that the MTU value configured for the VPLS instance is
consistent on both end, and the VC-ID and transmission mode for the peer is
also consistent.
■ The VPLS service processor card is not in Normal state: make sure that VPLS
service processor card is in Normal state.
Symptom 2: Packets cannot be forwarded.
Solution:
■ The service processor card is not in place: use the display device command to
verify that the service processor card is in Normal state.
■ The service processor card version is inconsistent with the SRP version: verify
the service processor card version.
■ The flow template and redirection are not correctly configured on the public
side: verify the port for the public network is correctly configured.
Symptom 3: Packets get lost during the course of forwarding
Solution:
■ Traffic exceeds VPN bandwidth restriction: Increase the VPN bandwidth.
Broadcast/multicast/unicast traffic exceeds the bandwidth set by broadcast
suppression ratio: Modify the broadcast suppression ratio and verify by checking
the broadcast suppression of the VPN and the broadcast traffic within the VPN.