Re: Redistribution Problem

yes Vince u r right it chooses the one with a lower Autonomous system
.Experts pls guide me for this question.

On Fri, Aug 27, 2010 at 11:35 AM, Vince Librandi <vlibrandi_at_internode.on.net
> wrote:

> Woops forgot to add the answer to your question.
>
> The router will only choose use the routes for a prefix from one routing
> protocol because that way it can guarantee at least for that AS it has a
> loop free path for the prefix (of course redistribution can negate that).
> But if the router where to install one route from one AS and another from a
> second AS it wouldn't be able to be sure that the path doesn't loop
> somewhere as the two AS's don't share routing information.
>
> So it looks like the router chooses the lowest AS number when the prefix
> length and AD are the same for a prefix.
>
>
> On 27/08/2010 3:05 PM, Vince Librandi wrote:
>
>> Hi Hemanth,
>>
>> I just lab'ed up your set up and got the same affect. Looks like when you
>> have two EIGRP process and the metric is the same and the AD on the route is
>> the same the router chooses the process with the lowest AS number. Just to
>> prove it I configured another EIGRP process (AS 50) on the R5-R4 link and
>> the router choose that path instead.
>>
>> R5(config-router)#do sh ip ei top
>> IP-EIGRP Topology Table for AS(100)/ID(10.1.45.5)
>>
>> Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
>> r - reply Status, s - sia Status
>>
>> P 1.1.1.1/32, 0 successors, FD is Inaccessible
>> via 10.1.35.3 (3097600/2585600), Serial0/1
>>
>> IP-EIGRP Topology Table for AS(200)/ID(1.1.1.2)
>>
>> Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
>> r - reply Status, s - sia Status
>>
>> P 1.1.1.1/32, 0 successors, FD is Inaccessible
>> via 10.1.45.4 (3097600/2585600), Serial0/0
>>
>> IP-EIGRP Topology Table for AS(50)/ID(10.1.45.5)
>>
>> Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
>> r - reply Status, s - sia Status
>>
>> P 1.1.1.1/32, 1 successors, FD is 3097600
>> via 10.1.45.4 (3097600/2585600), Serial0/0
>>
>>
>>
>> but if both links are in the same AS then I get the load balancing
>>
>> R5(config-router)#do sh ip ei top
>> IP-EIGRP Topology Table for AS(100)/ID(10.1.45.5)
>>
>> Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
>> r - reply Status, s - sia Status
>>
>> P 1.1.1.1/32, 2 successors, FD is 3097600
>> via 10.1.35.3 (3097600/2585600), Serial0/1
>> via 10.1.45.4 (3097600/2585600), Serial0/0
>>
>> Looks like this is the way the routing table chooses between routes handed
>> to it from different processes.
>>
>> Must see if OSPF does the same thing.
>>
>> Regards
>>
>> Vince
>>
>>
>> On 27/08/2010 1:21 PM, HEMANTH RAJ wrote:
>>
>>> s0/1 s0/0
>>> R2-------------------R3\s 0/2
>>> | | \
>>> |s0/0 s0/3 | \
>>> | | \ R1-loo 0
>>> 1.1.1.1/24
>>> | | \ s 0/0 R1-loo 1
>>> 11.11.11.11/24
>>> | | \
>>> | | / R5 R2-loo o 2.2.2.2
>>> /24
>>> | | / R2-loo 1
>>> 22.22.22.22/24
>>> | | / s 0/1
>>> | | /
>>> | s0/0 | /
>>> | s0/3 | /s0/2
>>> R1-------------------R4
>>> s0/1 s0/0
>>>
>>>
>>>
>>>
>>>
>>> I'm running ospf area 0 on R1,R2,R3 s 0/0,R4 s0/0
>>>
>>> R3 s0/3 ospf area 20
>>> R4 s0/3 ospf area 20
>>>
>>> R3 s0/2 eigrp AS 100
>>> R5 s0/0 eigrp AS 100
>>>
>>> R4 s0/2 eigrp AS 200
>>> R5 s0/1 eigrp AS 200
>>>
>>>
>>> I have done mutual redistribution on R3 between OSPF and EIGRP 100
>>>
>>> I have done mutual redistribution on R4 between OSPF and EIGRP 200
>>>
>>> Every route can ping every other route
>>>
>>> But when i check on R5 routing table I'm learning R1's loopback0 via R3
>>>
>>> But as per the logic it should load balance between R3 and R4 but it is
>>> choosing only R3
>>> and when i check on R5 topology table it shows the route via R4 is
>>> inaccessible
>>>
>>> I have reidstributed from opsf to eigrp with same metric on both R3 and
>>> R4
>>>
>>> R3
>>> router eigrp 100
>>> redis ospf 1 met 1 1 1 1 1
>>>
>>> R4
>>> router eigrp 200
>>> redis ospf 1 met 1 1 1 1 1
>>>
>>> But still R5 is choosing path via R3 and not loadbalancing between R3 and
>>> R4
>>>
>>> Can anyone help me out of this issue???
>>>
>>
>>
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-- 
Problems arise Bcoz we talk,prblms r not solve bcoz we dont talk So gud r
bad talk to ur affectionate one's freely
Urs Friendly,
HP HEMANTH RAJ
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