H3C Technologies H3C SR8800 - Manual (Page 25)

17
Solution
To resolve the problem, do the following:
• If IPoA is used, make sure that the IP protocol address mappings are configured correctly. If the
interfaces of two routers are connected back-to-back, the local PVC mapped to the remote IP must
be configured with the same VPI/VCI value as the remote PVC mapped to the local IP address. In
addition, the IP addresses of the two ends must be in the same network segment.
• If two routers are connected back-to-back, make sure that the connecting interfaces are configured
with different clock modes, that is, master at one end and slave at the other end. If you router is
connected to an ATM network, the clock mode on the ATM interface must be slave.
• Check the connecting ATM interfaces to make sure that they are of the same fiber-optic mode, that
is, both are multimode fiber interfaces or both are single mode fiber interfaces. In addition, make
sure that the mode of the connecting fibers is the same as that of the interfaces. (A multi-mode
fiber-optic interface can communicate with a directly connected single-mode fiber-optic interface
normally, but occasional excessive packet loss and CRC errors may occur sometimes.)
• If large ping packets cannot pass through while small ping packets can, check the MTU settings at
the two ends to make sure that the same MTU is configured at the two ends.
• Check that the PVC is up.
• Check that the same AAL5 encapsulation format is used at the two ends.
• Check that the PVC mappings for the PVC are consistent at the two ends.
• Check that the same framing format is configured at the two ends.
• Check that the same overhead byte setting is adopted at the two ends.
• Check that the same scrambling mode is adopted at the two ends.