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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.10, Part Number 78-11603-01 Rev. D0, July 2001
Chapter28 Troubleshooting
Troubleshooting the BPX Switch
Loopback Tests
Various loopback paths can be set up to help diagnose transmission problems. These rely on the use of
external test equipment to provide the source of a test signal.
The available loopback commands are listed in Table 28-4.
You set up a local loopback path (LL) in the local node at the PAD card (FRP) associated with the port
or connection to be tested. You then apply a test signal to the input. This passes through the associated
Interface Card (FRI), is sent to the Frame Relay PAD card (FRP) over the system bus where it is looped
back toward the input. This tests the cabling and the local node processing of the signal.
Test Port (tstport)—data Same as above except for synchronous data ports.
Display Connection States (dspconst) Displays in real-time the status of all voice connections terminating at a specified
node.
Display Breakout Box
(dspbob)—Frame Relay
Displays in real-time the status of data and control leads on selected Frame Relay
connection.
Display Breakout Box (dspbob)—data Same as above for synchronous data connections.
Display Breakout Box
(dspbob)—trunk
Same as above for network subrate trunks.
Display Buses (dspbuses) Displays the status of system buses.
Display Slot Errors (dspsloterrs) Displays any data errors associated with the slots in a BPX node.
Display Slot Alarms (dspslotalms) Displays any alarms associated with the slots in a BPX node.
Display Trunk Errors (dsptrkerrs) Displays any data errors associated with the network trunks connected to a node.
Table 28-3 System Troubleshooting Commands Available (continued)
Command Description
Table 28-4 System Loopback Tests
Command Description
Add Local Loopback (addloclp)—Frame
Relay port
Adds a loopback path at the Frame Relay port from the transmit side back
to the receive side at the local node.
Add Local Loopback (addloclp)—Frame
Relay connection
Does the same as above only for an individual Frame Relay connection.
Add Local Loopback (addloclp)—data Adds a loopback path at the synchronous data port from the transmit side
back to the receive side at the local node.
Add Local Loopback (addloclp)—voice Adds a loopback path for an individual voice channel on a circuit line at
the local node.
AddRemoteLoopback(addrmtlp)—Frame
Relay port
Adds a loopback path at the Frame Relay port from the transmit side back
to the receive side at the remote node.
AddRemoteLoopback(addrmtlp)—Frame
Relay connection
Does the same as above only for an individual Frame Relay connection.
AddRemoteLoopback(addrmtlp)—data Adds a loopback path at the synchronous data port from the transmit side
back to the receive side at the remote node.