Packet Loss And Crc Errors And Changes Of Interface State - 3Com MSR 50 Series Configuration Manual

Troubleshooting ATM 151
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 Symptom:
Errors and Changes of
Two routers are connected back-to-back, and a ping between them is successful,
Interface State
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,
namely, 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 above-mentioned faults.
Generally speaking, you can successfully locate most problems mentioned and not
mentioned above if you enable all the ATM debugging functions during the
process.