From: Shamin (ccie.xpert@gmail.com)
Date: Wed May 24 2006 - 23:12:14 ART
Thanks Victor,
Concept understood.
On 5/24/06, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
>
> 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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