From: Faryar Zabihi \(fzabihi\) (fzabihi@cisco.com)
Date: Mon Apr 24 2006 - 00:33:55 GMT-3
U can set the weight on the routers you are advertising to. R1 sends to
R2 and R3. R2 and R3 are most likely sharing routes with other routers
in AS 200. Just set the weights on those routers to 100 for R3 and 200
for R2.
Hope that makes sense.
Faryar
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Brian McGahan
Sent: Sunday, April 23, 2006 7:43 PM
To: Victor Cappuccio; CCIE LAB
Subject: RE: How to override the BGP Decision Process if possible?
You can use BGP conditional advertisement on R1 to accomplish
this.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Victor Cappuccio
> Sent: Sunday, April 23, 2006 6:11 PM
> To: CCIE LAB
> Subject: How to override the BGP Decision Process if possible?
>
> Hello All
>
> R1 in an AS 300 that is a dual homed system, lets say
>
> Router 1 in Remote-as 300
> Router 1 neighbor R2 in remote-as 200
> Router 1 neighbor R3 in remote-as 200
>
> Now the link between R1 and R3 is very slow, but the administrator of
AS
> 200 had set a Local Pref to 400 in R3 and 200 in R2.. Just for
example. -
> Not real world situation. - but it could happen ;)
>
> Is there any way I could override this situation??
>
> Rack1R2#show ip bgp 88.88.88.0
> BGP routing table entry for 88.88.88.0/24, version 43
> Paths: (2 available, best #1, table Default-IP-Routing-Table)
> Flag: 0x820
> Advertised to update-groups:
> 1
> 300 300 301, (Received from a RR-client)
> 164.1.23.3 from 164.1.23.3 (10.3.3.3)
> Origin IGP, metric 100, localpref 400, valid, internal, best 300
> 164.1.12.1 from 164.1.12.1 (10.1.1.1)
> Origin IGP, metric 200, localpref 100, valid, external
>
> Ok the BGP decision process goes like this Next Hop Reachable? ->
Weight
> -> Local Pref -> AS-PATH -> MED -> External (EBGP) is better than
> confederation external, which is better than IBGP
>
> But … lets look it this way, I’m the customer of As 200
and
> the administrators are very busy. is there any way to deal with this
> issue ? (beside shutting down my neighbor relation to R3) Also for
other
> good reasons the internal network of AS 200 (which I do not concern)
is
> using more Links to get to my AS 300
>
> Thanks
> Victor.-
>
>
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