H3C Technologies H3C S7500E Series Switches - Manual (Page 192)

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z
Check the routing tables of the PEs to see whether a route is available between the two PEs.
Check whether each device can ping the loopback interface of the peer and whether the LDP
session is normal.
z
Check whether any extended session configuration command is missing at either side.
z
Check whether the private network interfaces are up or whether the PW to the UPE is up.
z
Check whether the PW ID and transport mode are the same on the two peers.