R0106-HP MSR Router Series Layer 2 - WAN Configuration Guide(V7)

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Solution
Make sure the remote node supports the same application as configured on the local node. For example,
if the local node uses PPPoA, the remote node must also use PPPoA.
If the remote node supports the same application configured on the local node, make sure the two sides
use the same type of AAL5 encapsulation protocol. For example, if one side uses aal5snap and the other
uses aal5mux, they cannot communicate. You can enable ATM packet debugging to get some clues.