From: Brian Van Benschoten (vader@xxxxxxxxxxxx)
Date: Tue Oct 05 1999 - 08:54:17 GMT-3
Well I've been gone for a few months. My next attempt is Nov 10th.
I have a diagram posted at http://www.inxpress.net/~vader/ccie/ccie.jpg
it's only 25 k, don't be afraid
First off. OSPF is working fine and all routers can ping all interfaces.
The dial backup is initiated via a floating static route on R8. the route
points to the async interface to reach 172.16.7.7 (the loopback in question)
with an administrative distance of 250
R2 needs to be able to get to R7's loopback 0. Start extended ping on R2.
shutdown the S1 on R8. The dial backup comes up and R8 and R7 establish
neighbor adjacency and exchange routes. As soon as routes are propagated,
the pings continue.
Now for the hard part, drop the line (actually the line drops but not why I
think it should)
bring up S1 up on R8.
R8 and R5 talk, the virtual link comes back up. R7 gets a full table again.
R8 still sees the interfaces on R7 via the async interface. If I leave the
dialer idle timeout longer (10 minutes) R8 still wont learn R7's interfaces
via the serial link. The only reason the line drops is in this state is:
pings from R2 go to R8, out the async to R7. The return ping travels out R7
to R5 !!! then R8 back to R2.
It is in fact R7's dialer interface / idle timer that drops the line because
there is no outgoing traffic, only incomming. all the while R8 still shows
the path to R7 via the Async interface.
I can't figure it out
Now the configs
Router 7
interface Async1
ip address 172.16.1.1 255.255.255.0
encapsulation ppp
ip ospf cost 50000
bandwidth 14
async default routing
async mode dedicated
dialer in-band
dialer string 666-6666
dialer-group 2
no cdp enable
ppp authentication chap
router ospf 100
redistribute static metric 10000 metric-type 1 subnets
network 172.16.10.3 0.0.0.0 area 0
network 172.16.12.1 0.0.0.0 area 3
network 172.16.8.8 0.0.0.0 area 0
network 172.16.1.1 0.0.0.0 area 5
area 3 virtual-link 172.16.5.5
area 5 nssa default-information-originate
ip route 172.16.7.7 255.255.255.0 172.16.1.1 250
access-list 100 permit ip any 172.16.7.0 0.0.0.255
dialer-list 2 protocol ip list 100
Router 7
interface Async1
ip address 172.16.1.2 255.255.255.0
encapsulation ppp
ip ospf cost 50000
bandwidth 14
async default routing
async mode dedicated
dialer in-band
dialer string 666-6666
dialer-group 2
no cdp enable
ppp authentication chap
router ospf 100
redistribute connected metric 50 metric-type 1 subnets route-map
conn-to-ospf
network 172.16.97.1 0.0.0.0 area 5
network 172.16.99.1 0.0.0.0 area 5
network 172.16.7.7 0.0.0.0 area 5
network 172.16.96.1 0.0.0.0 area 5
area 5 nssa
access-list 100 deny ip any host 224.0.0.5
access-list 100 permit ip any any
dialer-list 2 protocol ip list 100
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