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Troubleshooting the BPX Switch
Table 28-3 System Troubleshooting Commands Available (continued)
Command
Test Port (tstport)—Frame Relay
Test Port (tstport)—data
Display Connection States (dspconst)
Display Breakout Box
(dspbob)—Frame Relay
Display Breakout Box (dspbob)—data Same as above for synchronous data connections.
Display Breakout Box
(dspbob)—trunk
Display Buses (dspbuses)
Display Slot Errors (dspsloterrs)
Display Slot Alarms (dspslotalms)
Display Trunk Errors (dsptrkerrs)
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 Frame Relay Module (FRM) card
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 FRM card over the system bus where it is
looped back toward the input. This tests the cabling and the local node processing of the signal.
Table 28-4 System Loopback Tests
Command
Add Local Loopback (addloclp)—Frame
Relay port
Add Local Loopback (addloclp)—Frame
Relay connection
Add Local Loopback (addloclp)—data
Add Local Loopback (addloclp)—voice
Add Remote Loopback (addrmtlp)—Frame
Relay port
Add Remote Loopback (addrmtlp)—Frame
Relay connection
Add Remote Loopback (addrmtlp)—data
Cisco BPX 8600 Series Installation and Configuration
28-6
Description
Tests the operation of the selected Frame Relay port on the node.
Same as above except for synchronous data ports.
Displays in real-time the status of all voice connections terminating at a specified
node.
Displays in real-time the status of data and control leads on selected Frame Relay
connection.
Same as above for network subrate trunks.
Displays the status of system buses.
Displays any data errors associated with the slots in a BPX node.
Displays any alarms associated with the slots in a BPX node.
Displays any data errors associated with the network trunks connected to a node.
Description
Adds a loopback path at the Frame Relay port from the transmit side back
to the receive side at the local node.
Does the same as above only for an individual Frame Relay connection.
Adds a loopback path at the synchronous data port from the transmit side
back to the receive side at the local node.
Adds a loopback path for an individual voice channel on a circuit line at
the local node.
Adds a loopback path at the Frame Relay port from the transmit side back
to the receive side at the remote node.
Same as above except for an individual Frame Relay connection.
Adds a loopback path at the synchronous data port from the transmit side
back to the receive side at the remote node.
Chapter 28
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Troubleshooting
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Troubleshooting
