[c-nsp] bgp advertisement

[Alban Dani]

Gert, Bruce,

thank you,

I am going to configure these tonight and see.

Alban


On 5/15/06, Bruce Pinsky <bep at whack.org> wrote:
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> Alban Dani wrote:
> > Hello,
> >
> > I have a best practice bgp advertisement question.
> >
> > I have to advertise networks 10.248.0.0/16 and 162.68.0.0/16 via BGP.
> >
> > I am currently advertising networks such as 10.248.12.0/24 etc and also
> > 162.68.128.0/17 because I have vlans with addresses in these subnets.
> >
> > I would like to avoid having to create new vlans in order to advertise
> > 10.248.0.0/16 and 162.68.0.0/16.
> >
> > What should I do?
> >
> > Can I just create some extra loopback interfaces?
> >
> >
>
> I presume you want to suppress the advertisement of the /24's and only
> advertise the aggregates?  If that is the case, see:
>
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094826.shtml
>
>
> for a discussion on route aggregation with BGP.
>
> You also need to be sure a route to the aggregate exists.  Easiest way to
> have a route to the /16's is to configure a static route to the Null0
> interface like:
>
>        route 10.248.0.0 255.255.0.0 null0
>        route 162.68.0.0 255.255.0.0 null0
>
> - --
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