Avaya Troubleshooting Routers Průvodce řešením problémů stáhnout pdf (Strana 135)

Troubleshooting a Network Layer Problem

308656-14.00 Rev 00

6-25

Check the slave site’s routing table for the routes it learned from the

master site. Do the same when the backup line activates.

Refer to one of the following sections if it applies to your problem:

•“Master Cannot Connect to Slave

”

•“Troubleshooting RS-232 Raise DTR Dial Services

”

•“Troubleshooting V.35 Raise DTR Dial (Balanced)

”

•“Troubleshooting ISDN BRI and PRI

”

Master Cannot Connect to Slave

In a dial-backup application, if the master side cannot connect to the slave side, do

the following:

Make sure the configuration file is correct.

If the connection is V.25bis, check the log for the CRN.

Try reversing the master and slave.

Make sure that you enabled BofL on the primary line.

If you can establish this connection, recheck the configuration of the modem and

router.

Troubleshooting RS-232 Raise DTR Dial Services

If a data terminal ready (DTR) signal is activated on the backup circuit (the master

side), causing the backup modem to dial even though the primary line is up, do the

following:

Verify that the modem is sending a data set ready (DSR) signal to the

router interface in the on state (positive voltage) when the local and

remote modems are not connected.

If it is, configure the modem so that DSR follows carrier detect (CD), or

configure DSR to be in the off state until the modem receives a DTR signal.

Unfortunately, DCE manufacturers use inconsistent terminology for these

settings.

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Avaya Troubleshooting Routers Průvodce řešením problémů Strana 135