From: Carlos Campos Torres \(ccampost\) (ccampost@cisco.com)
Date: Wed May 24 2006 - 20:35:39 ART
Also remember that you often use local-as community when you have
confederations for example, since you are using the same AS in all
sub-ASs, if you used no-export you would send it to all your
confederation peers, therefore probably that won't accomplish what you
might want in this task.
Just wanted to add this to everything that others have said =)
Regards,
Carlos Campos
(919) 392-6285
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Victor Cappuccio
Sent: Wednesday, May 24, 2006 1:06 PM
To: 'Shamin'; 'xprtofnet'
Cc: 'Cisco certification'
Subject: RE: BGP issue
The route-map in the network statement sets the configured options in
the Loc-RIB, so the route in the Router also has the configured value
(ie communities, etc) If you set the route-map to a neighbor then you
are affecting the Adj-RIBs-Out
http://www.ietf.org/rfc/rfc1771.txt
a) Adj-RIBs-In: The Adj-RIBs-In store routing information that has
been learned from inbound UPDATE messages. Their contents
represent routes that are available as an input to the Decision
Process.
b) Loc-RIB: The Loc-RIB contains the local routing information
that the BGP speaker has selected by applying its local policies
to the routing information contained in its Adj-RIBs-In.
c) Adj-RIBs-Out: The Adj-RIBs-Out store the information that the
local BGP speaker has selected for advertisement to its peers. The
routing information stored in the Adj-RIBs-Out will be carried in
the local BGP speaker's UPDATE messages and advertised to its
peers.
Victor.
-----Mensaje original-----
De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
Shamin Enviado el: Miircoles, 24 de Mayo de 2006 12:44 p.m.
Para: xprtofnet
CC: Cisco certification
Asunto: Re: BGP issue
Thanks for your reply.
So is it that, when you configure the following statement :
network 174.1.1.0 mask 255.255.255.0 route-map LOCAL_AS
We are informing the router that , this network should be assigned a
community of Local-As and for the same reason R1 does not advertise this
network to R3 as it sees the route with a Local-as Community assigned.
I got confused by seeing the route-map in the network statement. Never
used it before.
Regards
shamin
On 5/24/06, xprtofnet <xprtofnet@yahoo.com> wrote:
>
> by setting the community to "local-as" you are telling the router not
> to advertise this prefix out side your own local as.
>
> m2c
>
> --- Shamin <ccie.xpert@gmail.com> wrote:
>
> > Hi all,
> >
> > I am stuck in a problem from the IEWB VER3 LAB-8 Task 4.5. The
> > scenario is as follows :
> >
> >
> > BB3 (AS 54)
> > |
> > (EBGP) Eth0/0
> > {174.1.1.1/24}
> > |
> > |
> > R5(AS 65145) ----------- R1(AS
> > 65145 )
> > -----------(EBGP)----------- R3(AS 65038)
> > -----------(EBGP)---- R2(AS 65267)
> > |
> > |
> > |
> > |
> > |____R4(AS 65145)__|
> >
> >
> >
> > The question states as follows :
> > 1) Advertise 174.1.1.0/24 network into the bgp domain on R1
> > 2) Devices outside of AS 65145 should not have reachability to
> > this network
> > 3) Do not use any access-list or prefix lists to accomplish
> > this.
> >
> > The solution provided is as follows on R1 -
> >
> > R1#
> > router bgp 65145
> > network 174.1.1.0 mask 255.255.255.0 route-map
> > LOCAL_AS
> > neighbor 150.1.5.5 send-community
> > !
> > route-map LOCAL_AS permit 10
> > set community local-As
> >
> >
> > Can anyone help me understand the two statements under the router
> > bgp , especially the network statement. And what does this Local-As
> > community actually do. When i configured this in my lab, I was not
> > able to see the 174.1.1.0/24 network on R3 as required. Why didnt
> > R1 sent the update to R3 because as per above configurations , I
> > dont see any reason for
> > R1 not adverstising 174.1.1.0/24 to R3.
> >
> > Please help me understand the scenario.
> >
> > Regards
> > Shamin
> >
> >
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This archive was generated by hypermail 2.1.4 : Thu Jun 01 2006 - 06:33:22 ART