[c-nsp] bgp advertisement

[Bruce Pinsky]

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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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bep

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