Specifications

29-7
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 29 Troubleshooting
Troubleshooting the BPX Switch
Figure 29-1 Network Loopback Paths
Connection Testing
System software includes a Test Connection (tstcon) command for testing network connections. This
test is initiated by the network operator from the NMS console and can be performed at any time but it
momentarily interrupts traffic on the connection during the test. Testing a connection should be
performed only when an alarm has been reported from the connection or during off-hours.
Test Connection tests both directions of transmission from end-to-end and displays a pass or fail
indication for each connection tested. You may specify:
• a single connection,
• all connections,
• all connections of a particular type (voice, data, or frame relay),
• or a starting and ending connection number.
Local node Remote node
U
X
M
F
R
M
B
C
F
R
I
B
C
U
X
M
F
R
I
F
R
M
LL
RL
User
device
User
device
S5193
LL = Local Loopback path RL = Remote Loopback path
Local node
S
D
I
DSU
S
D
P
Loop
code
S5194