From: John Neiberger (neiby@xxxxxxxxxx)
Date: Tue Apr 02 2002 - 17:46:24 GMT-3
Demand circuit will not work if your access
list is denying OSPF. One thought that just
occurred to me would be to use time-based
ACLs so that OSPF is only allowed at certain
times, perhaps once per day. If you leave
demand circuit configured, the LSAs should
remain in your database.
If you're trying to get the routes to remain
in our routing table even when the link is
down, I think you're out of luck.
To be honest, though, why use OSPF here? I
think floating static routes would make more
sense.
Regards,
John
---- On Tue, 2 Apr 2002, Giveortake@aol.com
(Giveortake@aol.com) wrote:
> All,
>
> Basically I have a bunch of routers/routes
on one side and a bunch of
> routers/routes on the other side of a BRI
DDR link. I am trying to
> figure
> out how to make the BRI routers dial only
when interesting traffic (no
> OSPF
> updates) is dictated across the link.
Then after say 60 seconds of no
> interesting traffic I want the link to go
down but LEAVE THE OSPF tables
>
> intact. I have a hunch the secret
lies in the "IP OSPF DEMAND
> CIRCUIT"
> command, but I havent been able to make
the tables stay intact on BOTH
> routers. What am I missing??
>
> Thanks,
>
> David
>
> Sample Config:
>
> R2
>
> username R5 password cisco
>
> interface BRI0
> ip address 150.50.9.2 255.255.255.192
> no ip directed-broadcast
> encapsulation ppp
> no ip route-cache
> ip ospf message-digest-key 1 md5 cisco
> ip ospf network point-to-point
> ip ospf demand-circuit
> no ip mroute-cache
> dialer idle-timeout 60
> dialer map ip 150.50.9.5 name R5
broadcast 5418545
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 61678903240101
> isdn spid2 61678903250101
> no cdp enable
> ppp authentication chap
>
> access-list 101 deny ospf any any
> access-list 101 permit ip any any
> dialer-list 1 protocol ip list 101
>
>
> R5
>
> username R2 password cisco
>
> interface BRI0
> ip address 150.50.9.5 255.255.255.192
> no ip directed-broadcast
> encapsulation ppp
> ip ospf message-digest-key 1 md5 cisco
> ip ospf network point-to-point
> ip ospf demand-circuit
> dialer idle-timeout 60
> dialer map ip 150.50.9.2 name R2
broadcast 7890324
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 61654185450101
> isdn spid2 61654185460101
> ppp authentication chap
>
> access-list 101 deny ospf any any
> access-list 101 permit ip any any
> dialer-list 1 protocol ip list 101
>
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