From: Silvio Nunes (silvio_98@hotmail.com)
Date: Sun Nov 16 2003 - 11:51:08 GMT-3
Thank4s Jonathan. I got it.
Bye.
>From: "Jonathan V Hays" <jhays@jtan.com>
>To: "'Silvio Nunes'" <silvio_98@hotmail.com>, <ccielab@groupstudy.com>
>Subject: RE: MORE..BGP - Community attribute Date: Sun, 16 Nov 2003
>09:44:40 -0500
>
>Silvio,
>
>The LOCAL-AS attribute works in exactly the opposite manner: the route
>can only be advertised to peers within the same sub-AS within a
>confederation. The LOCAL-AS route will not be advertised to other AS's,
>even if the other AS is in the same confederation. See the excerpt from
>this link, included below.
>
>http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
>fipr_c/ipcprt2/1cfbgp.htm#1001855
>
>The communities attribute is an optional, transitive, global attribute
>in the numerical range from 1 to 4,294,967,200. Along with Internet
>community, there are a few predefined, well-known communities, as
>follows:
>
>internet-Advertise this route to the Internet community. All routers
>belong to it.
>
>no-export-Do not advertise this route to eBGP peers.
>
>no-advertise-Do not advertise this route to any peer (internal or
>external).
>
>LOCAL-AS-Do not advertise this route to peers outside the local
>autonomous system. This route will not be advertised to other autonomous
>systems or sub-autonomous systems when confederations are configured.
>Based on
>
>
> >-----Original Message-----
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> >Behalf Of Silvio Nunes
> >Sent: Sunday, November 16, 2003 9:24 AM
> >To: ccielab@groupstudy.com
> >Subject: MORE..BGP - Community attribute
> >
> >
> >Regarding LOCAL-AS attribute, I4d like to confirm:
> >
> >A route with a LOCAL_AS attribute can be advertised to peers in other
> >subautonomous systems within a confederation, but I4m trying
> >and it is not
> >working... the route cannot be advertised to another
> >subautonomous systems..
> >
> >AS3 (R3)......[ AS10 (subAS5 -R5)----- (subAS5 - R2) ........
> >(subAS6 - R6)]
> >|
> >|
> >222.222.222.0
> >
> >In this example, R2 (in the same subAS) has 222.222.222.0. R6
> >(in another
> >subAS) cannot get the same route:
> >
> >(R5)
> >router bgp 5
> >bgp router-id 5.5.5.5
> >bgp cluster-id 3368601605
> >bgp log-neighbor-changes
> >bgp confederation identifier 10
> >bgp confederation peers 6
> >neighbor 2.2.2.2 remote-as 5
> >neighbor 2.2.2.2 ebgp-multihop 5
> >neighbor 2.2.2.2 update-source Loopback0
> >neighbor 2.2.2.2 send-community
> >neighbor 2.2.2.2 route-map MODCOMMUNITY out
> >neighbor 3.3.3.3 remote-as 3
> >neighbor 3.3.3.3 ebgp-multihop 5
> >neighbor 3.3.3.3 update-source Loopback0
> >
> >access-list 33 permit 222.222.222.0 0.0.0.255
> >
> >route-map MODCOMMUNITY permit 10
> >match ip address 33
> >set community local-as
> >!
> >
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> >
>
>
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