Using backup interface to backup multipoint serial interface

From: Pun, Alec CL (Alec.CL.Pun@pccw.com)
Date: Sun Nov 09 2003 - 01:20:37 GMT-3

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I just read a sample configuration to use backup interface to backup
multipoint serial interface.
R1 serial interface is a multipoint interface having DLCI to R2 & R3. My
question is if I use backup interface bri0 on the serial interface of R1
only, in case R2 is down, R1 may not kick up the ISDN connection 'coz the
PVC to R3 is still UP and that makes the serial interface remains UP too.
Please correct if I made any wrong assumtions.

thanks
alec

R1 ----- ISDN ----- R2
 | |
 |---------FR -----------|
 |
 |
R3

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