R3303-HP HSR6800 Routers Layer 2 - WAN Configuration Guide

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If the remote node supports the same application configured on the local node, make sure that the two
sides use the same type of AAL5 encapsulation protocol. For example, if one side uses SNAP whereas
the other uses MUX, they cannot communicate. You can enable the packet debugging function of ATM
to get some clues.
Packet loss and CRC errors and changes of interface state
Symptom
Two routers are connected back-to-back, and a ping between them is successful, but sometimes there are
large amount of packets lost and frequent CRC errors, or the interface state alternates between UP and
DOWN.
Solution
Check the ATM interfaces of the two nodes to see if their types are the same (both are multimode fiber
interface or both are single-mode fiber interface). If their types are different, you should change one of
them. In most cases, when a multimode fiber interface and a single-mode fiber interface are directly
connected, they can communicate, but sometimes with the mentioned faults.