3com 3031 Instruccion De Instalación

Troubleshooting

239

Networking diagram

Figure 46 Networking diagram of ISDN configuration

Configuration procedure

1 Configure Router A

a Create an ISDN PRI interface.

[3Com]controller e1 3/0/0

[3Com-E1 3/0/0]pri-group timeslots 1-31

[3Com-E1 3/0/0]quit

b Configure an ISDN PRI interface.

[3Com]interface serial 0/0/0:15

[3Com-Serial0/0/0:15]ip address 202.38.154.1 255.255.0.0

[3Com-Serial0/0/0:15]dialer enable-legacy

[3Com-Serial0/0/0:15]dialer route ip 202.38.154.2 8810154

[3Com-Serial0/0/0:15]dialer-group 1

[3Com-Serial0/0/0:15]quit

[3Com]dialer-rule 1 protocol ip permit

2 Configure Router B

The parameter configuration of Router B is similar to that of Router A. It would
not be repeated here.

Troubleshooting

Fault: Two routers are interconnected via ISDN PRI line and they cannot ping
through each other.

Problem solving:

■

Execute the

display isdn call-info

command. If there is no prompt in the

system, it indicates there is no ISDN PRI interface. Thus it is necessary to
configure corresponding interfaces. For specified configuration method, refer
to the contents about configuration of CE1/PRI interface and CT1/PRI interface
in PartIII “Interface”. If the ISDN is not in multi-frame operation status on a PRI
interface, it may not physically connected.

■

If the Q.921 debugging has been enabled, and the ISDN on PRI is in
multi-frame creation mode, check whether dial-up configuration is wrong. If
the debugging information “Q921 send data fail(L1 return failure).” is output,
it indicates that physical layer has no been activated. In this case, execute the

ISDN Network

202.38.154.1

202.38.154.2

8810152

8810154

Router A

Router B

cE1/PRI