Atm Interface State Error; Pvc State Is Down While Atm Interface State Is Up; Ping Failure After Pppoa Configuration - H3C SR6600 Configuration Manual

have the same VPI/VCI value as the remote PVC mapped to the local IP. In addition, the IP
addresses of the two ends must also be in the same network segment.
If two routers are connected back-to-back, make sure that at least one of interfaces uses internal
transmission clock (master). Or, if the routers are connected to the ATM network, the transmission
clock should be set to line clock.
Check the ATM interfaces of the two sides to make sure that they are of the same type, for example,
both are multimode fiber interfaces or both are single mode fiber interfaces, or both are multimode
fiber interfaces but connected using single mode. If a multimode fiber interface and a single mode
fiber interface are directly connected, they can communicate in most cases, but sometimes with
frequent packet dropping and CRC errors.
If the two ends are PPPoA, make sure that their IP addresses (should be in the same network
segment) and authentication parameters are correctly configured.
If, according to the ping command, small packets can pass but big packets cannot, make sure that
the mtu configurations of the two router interfaces are the same.

ATM Interface State Error

Symptom
The interface state of ATM is DOWN.
Solution
Make sure that the optical fibers are correctly plugged to ATM interface. There should be two optical
fibers, one for receiving information and one for sending information. The two are not exchangeable. If
they are wrongly plugged, the interface state of ATM cannot be UP.
If two routers are connected back-to-back, check if neither of the two ATM interfaces enables internal
transmission clock. By default, routers use line clock. If two routers are connected back-to-back, one of
them should be configured as internal transmission clock with the clock master command.

PVC State is Down while ATM Interface State is Up

Symptom
The interface state of ATM is UP, but the PVC state is DOWN.
Solution
Check if this fault results from enabling OAM F5 Loopback cell transmission and retransmission
detection or OAM continuity check. When two ATM devices are connected, the VPI/VCI value of the
PVCs on the two devices must be the same. Provided that OAM F5 cell transmission and
retransmission detection or OAM continuity check is enabled, and the VPI/VCI value of the remote node
(connected directly with the local node) is not the same as the local node, the local PVC state cannot
change into UP.

Ping Failure after PPPoA Configuration

Symptom
The PVC state is UP, but after applications like IPoA are configured, the remote node cannot be
successfully pinged.
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