how to ensure dlsw traffic des not bring the isdn link

From: beda jain (bpjain@cisco.com)
Date: Fri Sep 13 2002 - 16:29:54 GMT-3


r2--------------isdn------------r7--------------------O
| |
r5---------------------------------|

r5 is hub r2 and r7 are spoke . all router are running ospf in area 0.

dlsw peer between r7 and r2, r7 and r5.

the peer between r2 and r7 should be prefer by r5 if r5 is down then it
should prefer by isdn.

I think all can be controlled by routing , we can increase the cost between
r7 and r2 ti higher then r5.

or do we need do some thing else ?????

i did not like the solution given by routparia lab 2.

interface BRI0
  ip address 172.16.27.1 255.255.255.252
  no ip directed-broadcast
  encapsulation ppp
  no ip route-cache
  ip ospf message-digest-key 1 md5 cisco
  ip ospf demand-circuit
  no ip mroute-cache
  dialer map llc2 name R7 broadcast 5552000 why this is required.
  dialer map ip 172.16.27.2 name R7 broadcast 5552000
  dialer map snapshot 27 broadcast 5552000
  dialer load-threshold 128 either
  dialer-group 1
  ipx network 27
  isdn switch-type basic-5ess
  no peer neighbor-route
  snapshot client 6 60 dialer
  compress predictor
  ppp quality 70
  ppp authentication chap
  ppp multilink
!

access-list 1 permit 172.16.50.0 0.0.0.255
access-list 100 deny ip any host 224.0.0.5 why this is required when it
is ospf demand circuit is configure.
access-list 100 permit ip any any
dialer-list 1 protocol llc2 permit why this is required
dialer-list 1 protocol ip list 100
!



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