Re: OSPF Distance Command .!

Hey Divin,

I ran into this same thing on Wednesday. I tried to use the distance command
in the same fashion. I wanted to prefer some routes to go to one neighbor
instead of another. I got the same results as you show below. If there was
another available next-hop, it changed the AD for both paths.

I ended up doing "distance 255 1.1.1.1 0.0.0.0 Named_ACL". This effectively
deleted one of the routes out of my routing table. In that scenario, I lost
my redundant route... but it seemed to fit the requirements.

I don't know that its a bug, but I can confirm another human being saw the
same issue you did :P

Chris

On Thu, May 21, 2009 at 4:13 PM, Divin Mathew John <divinjohn_at_gmail.com>wrote:

> I have this problem. i am trying to change the A.D of a particular path in
> OSPF using distance command. My config is pasted below.
> Topology
>
> R0
> interface Loopback0
> ip address 100.100.0.100 255.255.255.0
> !
> interface Loopback1
> ip address 100.100.1.100 255.255.255.0
> !
> interface Loopback2
> ip address 100.100.2.100 255.255.255.0
> !
> interface Loopback3
> ip address 100.100.3.100 255.255.255.0
> !
> interface Serial0/0
> ip address 10.1.1.1 255.255.255.252
> serial restart-delay 0
> !
> interface Serial0/1
> ip address 20.1.1.1 255.255.255.252
> serial restart-delay 0
> !
>
> router ospf 1
> log-adjacency-changes
> network 10.1.1.1 0.0.0.0 area 0
> network 20.1.1.1 0.0.0.0 area 0
> network 100.100.0.100 0.0.0.0 area 0
> network 100.100.1.100 0.0.0.0 area 0
> network 100.100.2.100 0.0.0.0 area 0
> network 100.100.3.100 0.0.0.0 area 0
> distance 90 12.1.1.1 0.0.0.0 SELECT_12.1.1.0_from_R1
> !
> ip access-list standard SELECT_12.1.1.0_from_R1
> permit 12.1.1.0
>
> R0#show ip ospf neighbor
>
> Neighbor ID Pri State Dead Time Address Interface
> 20.1.1.2 0 FULL/ - 00:00:37 20.1.1.2 Serial0/1
> 12.1.1.1 0 FULL/ - 00:00:33 10.1.1.2 Serial0/0
>
> R0#sir
> Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2
> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
> ia - IS-IS inter area, * - candidate default, U - per-user static
> route
> o - ODR, P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> 1.0.0.0/24 is subnetted, 1 subnets
> O 1.1.0.0 [110/65] via 10.1.1.2, 00:01:35, Serial0/0
> 2.0.0.0/32 is subnetted, 1 subnets
> O 2.2.0.2 [110/65] via 20.1.1.2, 00:01:35, Serial0/1
> 100.0.0.0/24 is subnetted, 4 subnets
> C 100.100.0.0 is directly connected, Loopback0
> C 100.100.1.0 is directly connected, Loopback1
> C 100.100.2.0 is directly connected, Loopback2
> C 100.100.3.0 is directly connected, Loopback3
> 20.0.0.0/30 is subnetted, 1 subnets
> C 20.1.1.0 is directly connected, Serial0/1
> 10.0.0.0/30 is subnetted, 1 subnets
> C 10.1.1.0 is directly connected, Serial0/0
> * 12.0.0.0/30 is subnetted, 1 subnets
> O 12.1.1.0 [90/128] via 20.1.1.2, 00:01:36, Serial0/1
> [90/128] via 10.1.1.2, 00:01:36, Serial0/0*
>
> according to my distance command only the route from R1 should have changed
> its A.D. but here even though i specified the ROUTER-ID of the router whose
> path i need to change the A.D it doesn't change that... it changes the A.D
> of all paths to the destination..! is this a BUG?
>
>
> Thanking You
>
> Yours Sincerely
>
> Divin Mathew John
> divinjohn_at_gmail.com
> divin_at_dide3d.com
> http://www.dide3d.com
> +91 9945430983
> +91 9846697191
> +974 5008916
> PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
> Sent from Bangalore, KA, India
>
>
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Received on Thu May 21 2009 - 20:22:07 ART