R3102-R3103-HP 6600/HSR6600 Routers Layer 2 - WAN Configuration Guide

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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.