ospf demand circuit and backup interface & snapshot

From: Ong Boon Hui (ongbh@cet.st.com.sg)
Date: Sun Feb 16 2003 - 22:55:24 GMT-3


Hi Group,

Would like to know the effect of the above concurrently.

Pls hlp look at the following configuration : -

interface BRI0
 ip address 172.16.56.5 255.255.255.248
 no ip directed-broadcast
 encapsulation ppp
 ip ospf cost 9999
 ip ospf demand-circuit
 dialer idle-timeout 30
 dialer map snapshot 1 name r6 broadcast xxxxxxxxx
 dialer map ip 172.16.56.6 name r6 broadcast xxxxxxx
 dialer load-threshold 1 outbound
 dialer-group 1
 isdn switch-type basic-net3
 snapshot client 5 10 dialer
 no peer neighbor-route
 ppp authentication chap
 ppp multilink

router ospf 1
 router-id 5.5.5.5
 area 0 authentication message-digest
 area 0 range 172.16.100.0 255.255.255.0
 redistribute connected subnets route-map connect
 redistribute eigrp 1 metric-type 1 subnets route-map eigrp1_2_ospf
 redistribute eigrp 14 metric-type 1 subnets route-map eigrp1_2_ospf
 redistribute rip metric-type 1 subnets tag 11 route-map rip_2_ospf
 network 5.5.5.5 0.0.0.0 area 0
 network 10.10.10.5 0.0.0.0 area 50
 network 172.16.5.1 0.0.0.0 area 0
 network 172.16.56.5 0.0.0.0 area 0
 network 172.16.100.5 0.0.0.0 area 0
 network 172.16.104.5 0.0.0.0 area 25

My questions : -

1. Will a change in any OSPF link state database fire the ISDN ? I would think
not as it is under standby mode for the serial interface.

2. I initiated a shut down on my frame-relay for the serial interface. OSPF
came up on the bri 0 and does not go down for the dialer idle timeout which is
10 seconds. Recovered the frame relay link and the bri came down. Is this teh
right behaviour.

3. Does this means the snapshot will only work when the frame relay goes down
?

4. If I have another GRE tunnel that goes across the frame relay cloud and
runs RIP through it. When the serial interface is down, will RIP or GRE tunnel
trigger the BRI interface ?

Thx,
Debarros



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