H3C Technologies H3C SR8800 - Manual (Page 62)

55
Troubleshooting E-CPOS interfaces
Symptom
An E-CPOS interface is physically up, the channelized POS interfaces on it are up, but its link layer is
down.
Solution
• The physical parameter settings (such as clock source and scrambling) on the E-CPOS interface do
not match those on the remote E-CPOS interface.
• The link layer protocol of the POS channel does match that of the remote POS channel.
• The bandwidth of POS interfaces channelized from the local E-CPOS interface is not the same as
that of POS interfaces channelized from the remote E-CPOS interface.
• POS interfaces channelized from the local E-CPOS interface are not the same as POS interfaces
channelized from the remote E-CPOS interface in POS interface number.
• PPP authentication fails on the virtual POS interface. PPP authentication maybe fails due to incorrect
PPP authentication parameters.
You can use the display interface pos interface-number command to display the multiplexing path and
PPP link negotiation information of the specified POS interface.
An interface may be in one of the following four states:
• Posinterface-number current state: DOWN ( Administratively ). Line protocol current state: DOWN,
indicating that the interface is administratively shut down.
• Posinterface-number current state: DOWN. Line protocol current state: DOWN, indicating that the
interface is not enabled or has not gone up on the physical layer
• Posinterface-number current state: UP. Line protocol current state: UP, indicating that the interface
has passed LCP negotiation.
• Posinterface-number current state: UP. Line protocol current state: DOWN, indicating that the
interface has been activated but has not passed LCP negotiation.