Troubleshooting Pos Interfaces; Interface Physically Down; Data Link Layer Down - H3C SR6600 Configuration Manual

# Set the clock mode to slave on POS 2/1/1.
[RouterB] interface pos 2/1/1
[RouterB-Pos2/1/1] clock slave
# Enable Frame Relay on POS 2/1/1.
[RouterB-Pos2/1/1] link-protocol fr
# Configure POS 2/1/1 as DTE.
[RouterB-Pos2/1/1] fr interface-type dte
# Assign an IP address to POS 2/1/1.
[RouterB-Pos2/1/1] ip address 10.10.10.2 255.255.255.0
# Assign a virtual circuit with DLCI 70 to POS 2/1/1.
[RouterB-Pos2/1/1] fr dlci 70
[RouterB-Pos2/1/1-fr-dlci-70] quit
# Map DLCI 70 to the peer IP address 10.10.10.1.
[RouterB-Pos2/1/1] fr map ip 10.10.10.1 70
# Set the MTU to 1500 for POS 2/1/1.
[RouterB-Pos2/1/1] mtu 1500
3. Configure Router C in the same way Router B is configured. (Details not shown.)
Verifying the configuration
# Verify the POS interface settings.
<RouterA> display interface pos
# Verify that Router A and Router B can ping each other. (Details not shown.)
# Verify that Router A and Router C can ping each other. (Details not shown.)

Troubleshooting POS interfaces

Interface physically down

Symptom
The physical state of the POS interface is down.
Solution
To resolve the problem:
•
Verify that the POS interface is connected correctly to the remote port.
The transmit connector at one end must be connected to the receive connector at the other
end.
The transmit and receive connectors of the POS interface are not connected by the same
fiber. If they are connected by the same fiber, the display interface command displays the
"loopback detected" message, whether or not the loopback detection feature is enabled.
•
If the two POS interfaces are directly connected, verify that the two ends use different clock
mode settings.
•
If the problem persists, contact H3C Support.

Data link layer down

Symptom
The physical layer is up, but the data link layer is down.
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