This does not sound like a bug, just that your R1-R2 link is an OSPF
network type which has a DR elected. The DR acts as a pseudonode which
has 0 cost connections to each of the routers on that subnet; so it is a
virtual router located between R1 and R2. It is the DR pseudonode which
is advertising the link. When you apply your distance command it only
has an effect if the router you match is advertising the subnet, i.e. if
it is the DR. You have two equal cost paths to the pseudonode, so if
your distance command matches the pseudonode, the AD of both will be
changed.
Hope this helps,
Paul.
Divin Mathew John wrote:
> This is wht i got in the end of the day.
>
> R1-----R0------R2 and there is a connection between R1 and R2. So R0 has 2
> paths to that segment between R1 and R2.
> R1
> 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
> !
> interface Serial0/2
> no ip address
> shutdown
> serial restart-delay 0
> !
> interface Serial0/3
> no ip address
> shutdown
> serial restart-delay 0
> !
> router ospf 1
> router-id 100.100.100.100
> 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 22.22.22.22 0.0.0.0 SELECT_12.1.1.0_from_R1
> !
> ip http server
> ip forward-protocol nd
> !
> !
> !
> !
> ip access-list standard ONLY_R1_LOOPBACKS
> permit 1.1.0.0
> ip access-list standard SELECT_12.1.1.0_from_R1
> permit 12.1.1.0
> ip access-list standard SELECT_12.1.exit
> !
> !
> All router-id Hardcoded. all processes cleared. clear ip route * done.
>
>
> R0's Routing Table
> when R2's ROUTER-ID is lower than R1, A.D of the both the paths gets changed
> to the one configured on the Distance command.
> 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, 00:02:07, Serial0/0
> 2.0.0.0/24 is subnetted, 1 subnets
> O 2.2.0.0 [110/65] via 20.1.1.2, 00:02:07, 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, 00:02:08, Serial0/1
> [90/128] via 10.1.1.2, 00:02:08, Serial0/0
>
> When R1's Router-ID is Lower than R2 and R1 hasnt reached the FULL state
> with R0. The route thru R2 is shown with A.D of 90(specified in the config.]
> 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
>
> 2.0.0.0/24 is subnetted, 1 subnets
> O 2.2.0.0 [110/65] via 20.1.1.2, 00:00:09, 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, 00:00:09, Serial0/1
>
> After R0 -- R1 FULL state
> 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, 00:00:01, Serial0/0
> 2.0.0.0/24 is subnetted, 1 subnets
> O 2.2.0.0 [110/65] via 20.1.1.2, 00:00:01, 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 [110/128] via 20.1.1.2, 00:00:02, Serial0/1
> [110/128] via 10.1.1.2, 00:00:02, Serial0/0
>
>
> I haven't beeen able to reason why this happens..? but it happens.! and "Say
> you have 2 paths to a destination network, then the A.D of the route thru
> the Nieghbour with the lowest Router-ID is applied to the other routes thru
> different nieghbors or paths" I have no idea why..!
>
> any ideas?
>
> when R
> 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
>
> On Fri, May 22, 2009 at 5:52 AM, Chris Breece <cbreece1_at_gmail.com> wrote:
>
>
>> 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
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
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>
>
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Received on Fri May 22 2009 - 07:04:23 ART
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