From: alain faure (alainfaure@xxxxxxxx)
Date: Sun May 27 2001 - 16:30:51 GMT-3
Hello,
Just a question, Is the two link from the same provider ?
If so isn't it possible to use MED instead for as prepend ?
If not why ?
Best regards
--- rsevier <rsevier@zealousolutions.com> a icrit : > Matt is correct. Below
is a sample config. Check it carefully because I
> put it together quickly. Notice as-path 3, that is there to not have
> packets coming from williams to have to out their network to come in L3's
> connection. this will allow the williams packets to come in through the
> william's connection and not to touch L3's network at all.
>
> matt- say hi to Ken Walls and Eddie for me.
>
> neighbor x.x.x.x remote-as 3356
> neighbor x.x.x.x version 4
> neighbor x.x.x.x route-map from-willims in
> neighbor x.x.x.x route-map TO-williams out
> neighbor x.x.x.x remote-as 3356
> neighbor x.x.x.x version 4
> neighbor x.x.x.x route-map from-willims in
> neighbor x.x.x.x route-map TO-williams out
>
> neighbor x.x.x.x remote-as (william's AS)
> neighbor x.x.x.x ebgp-multihop 2
> neighbor x.x.x.x update-source Loopback0
> neighbor x.x.x.x version 4
> neighbor x.x.x.x route-map from-L3 in
> neighbor x.x.x.x filter-list 10 out
>
>
> ip as-path access-list 1 permit .*
> ip as-path access-list 2 permit ^$
> ip as-path access-list 3 permit ^(williams AS)$
> ip as-path access-list 10 permit ^$
>
> route-map from-L3 permit 10
> match as-path 1
> set local-preference 150
> !
> route-map from-williams permit 10
> match as-path 3
> set local-preference 160
> !
> route-map from-williams permit 20
> !
> route-map TO-willaims permit 10
> match as-path 2
> set as-path prepend 3356 3356 3356 3356 3356 3356 3356 3356
>
> Raymond
>
>
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Matt.Wilkerson@Level3.com
> Sent: Tuesday, May 22, 2001 7:41 AM
> To: oriya@techiesclub.com
> Cc: ccielab@groupstudy.com
> Subject: RE: BGP Question
>
>
> Finally... 1 I can contribute on :>)
>
>
> You need to use a route-map on your bgp "neighbor x.x.x.x" statements. There
> are 2 directions of traffic you need to influence, your inbound traffic and
> your outbound traffic. This can most easily be done by adjusting the "as
> path" and the "local pref" attributes.
>
> On the outbound route-map, you'll need a "match" statement which will permit
> any, followed by a set statement, which will prepend your AS a couple times
> on the Williams link. This will make your williams link appear to have a
> longer route, than the Level3 path. Which will shift your incoming traffic
> to the Level3 link.
>
> ex. L3- 3356-YourAS
> Williams 5555-YourAS-YourAS-YourAS-YourAS
> <----this appears a longer route
>
> To affect your outbound traffic, you'll need to tag the Level3 link with a
> higher "local-pref" See the short examples below...
>
>
> #######################################
> route-map Williams-Outbound-Map permit 10
> match ip address 1 <---------references access list 1
> set as-path prepend 3356 3356 3356
>
> route-map Level3-Inbound-Map permit 10
> match ip address 1 <--------Same here
> set local-preference 200
>
> access-list 1 permit any
>
>
> router bgp YourAS
> neighbor 1.1.1.1 route-map Williams-Outbound-Map out
> neighbor 2.2.2.2 route-map Level3-Inbound-Map in
> ######################################
>
>
>
>
>
>
>
> -----Original Message-----
> From: Oriya Pollak [mailto:oriya@techiesclub.com]
> Sent: Tuesday, May 22, 2001 11:09 AM
> To: ccielab
> Subject: BGP Question
>
>
> Let me ask you all a question.
>
> I have BGP running between our router to our 2 Internet uplinks - Level3
> Communications and Williams Communications. I would like to push almost no
> traffic or not at all to Williams but I do want to have it up in case level3
> goes out and traffic needs to go on Williams.
>
> Any ideas?
>
> Oriya
> **Please read:http://www.groupstudy.com/list/posting.html
> **Please read:http://www.groupstudy.com/list/posting.html
> **Please read:http://www.groupstudy.com/list/posting.html
=====
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alainfaure@yahoo.fr
Computing networks & internet specialist
Certified Cisco(ccna,ccnp),Microsoft(mcse),Novell(cna)
tel./fax. 33 (0)1 45 87 95 07 PARIS(FRANCE)
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