Question 710
An interworking pseudowire carries Ethernet between dissimilar CE interfaces. Observed: Data is discarded because the ingress and egress service framing differ. After the correction, which result would most convincingly show that this fault is resolved?
Explanation
Correct Answer
After select a supported interworking mode and align encapsulation on both PEs, inspect whether test frames cross with correct service framing and no unexpected protocol drops. This closes the loop between the reported observation (Data is discarded because the ingress and egress service framing differ) and the underlying issue (Layer 2 interworking and payload encapsulation expectations are incompatible).
Incorrect Answers
That observation would verify a separate fault involving mac aging and control-plane refresh behavior conflict with the active service topology. Its symptom is One CE continues forwarding to a moved MAC on a stale port. For this case the actual issue is layer 2 interworking and payload encapsulation expectations are incompatible, and the relevant success signal is Test frames cross with correct service framing and no unexpected protocol drops.
This result is useful in another case with evidence One remote PE receives BGP routes but does not establish the required connection. It does not test recovery from data is discarded because the ingress and egress service framing differ. Check instead whether test frames cross with correct service framing and no unexpected protocol drops.
It confirms an unrelated service correction: MAC/IP route type 2 advertisement or its route-target import is missing. The present case reports Data is discarded because the ingress and egress service framing differ. Its completion test is Test frames cross with correct service framing and no unexpected protocol drops.