Dear Bryan,
Thanks a lot for your support. But i wanted to know exactly on what basis
would the router choose one path over the other and let me explain.
If the 2 paths are completely equal in every thing the last three tiebrakers
will be as follows.
1- Prefer the path from the lowest BGP router ID
(The Router ID is the same as the route came from a RR so both routes
have the same originator)
2- prefer the path with the minimum cluster length.
(again the 2 paths have the same cluster length)
3- Prefer the path with the lowest neighbor address.
(I think that both will have the same value as the 2 routes again are
originated from the same Router which is the RR).
That's is why i wanted to know what is the exact criteria to prefer one
route over the other as in this specific example in the WB i tried flapping
the session between the CE and R3 but every time once the session go up the
router is the other AS starts prefering the route from R3 again.
Again thanks a lot for your help.
On Sat, Oct 17, 2009 at 11:42 PM, Bryan Bartik <[email protected]> wrote:
> Karim,
>
> The path selection process is the same. Not sure what the tie-breaker is in
> this case but it looks like it's pretty far down the list...
>
> On Fri, Oct 16, 2009 at 11:13 AM, karim okasha <[email protected]> wrote:
>
>> Dear all,
>>
>> I have a problem with task 7.4 in this Lab. this task states that we need
>> to configure R9 so that traffic from R8 always favors R2.
>>
>> The solution is understood but my problem is why in the first place does
>> R8 favors the route coming from R3 instead of the Router coming from R2.
>>
>> I need to understand how BGP selects the best route in the following
>> situation.
>>
>> ---- PE1
>> CE1 -- ---- ASBR ---- ASBR --- PE3
>> --- PE2 (RR) (RR)
>>
>> How is PE3 going to choose the best path towards CE1.
>>
>> Your help is very much appreciated.
>>
>>
>> _______________________________________________
>> For more information regarding industry leading CCIE Lab training, please
>> visit www.ipexpert.com
>>
>>
>
>
> --
> Bryan Bartik
> CCIE #23707 (R&S), CCNP
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com
>
_______________________________________________
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