8-71
Configuring Demand Routing for Primary ISDN Modules
Troubleshooting Demand Routing
Checking the BRI Interface
To ensure that the status of the BRI interface is up and the line status is ready,
enter the following command from the enable mode context:
ProCurve# show interface bri <slot>/<number>
If the BRI interface is administratively down, enter no shutdown to activate it.
When you activate the BRI interface, it exchanges a series of messages with
the ISDN switch at the CO. First, the BRI interface and the switch complete a
handshaking process to bring up the Physical Layer. Then the ISDN switch
polls the line for terminal equipment identifiers (TEIs), which identify the
ISDN line.
The TEI #1 identifies the first B channel, and the TEI #2 identifies the second.
The BRI interface sends the LDNs and/or SPIDs configured for the channels
(SPID1 for the TEI #1 and SPID2 for the TEI #2). After the switch receives the
correct SPIDs or LDNs, the ISDN line goes up.
When you enter the show interfaces bri command, the line status indicates
the point at which the handshaking process breaks down. For example, in
Figure 8-25 the ISDN switch is attempting to get the BRI interface’s SPID1.
Figure 8-25. Troubleshooting a BRI Interface
Table 8-15 lists the possible designations for the line status and the steps you
might take to change the status.
bri 1/2 is DOWN
Line status: getting TEI #1
Caller ID will be used to route incoming calls
Caller ID normal
Switch protocol: AT&T 5ESS
SPID 1 25655522220101, LDN 1 5552222
SPID 2 n/a, LDN 2 n/a
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1115 packets input, 0 bytes, 0 no buffer
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame
0 abort, 0 discards, 0 overruns
1117 packets output, 0 bytes, 0 underruns
The switch at the
CO cannot identify
the interface.
Check the SPID and
LDN
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