[c-nsp] advertising a route not in IGP

[PA]

Might be possible to advertise the /16 via the network command and then use
bgp aggregate to only send out the /24.
Haven't tested this, not sure if you can aggregate into a smaller network.
It's just a suggestion. 



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Heath Jones
Sent: Thursday, September 23, 2010 9:25 AM
To: Jeff Bacon
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] advertising a route not in IGP

> One vendor I need to connect to, I need to advertise a specific /24
> (10.200.16.0/24) to the eBGP neighbor. OF course BGP won't advertise the
> route to the eBGP neighbor because the /24 isn't in IGP, only the /16
> summary.

I don't think your going to have much luck. What you are asking, it to
put a route in adj-out that is not in the actual routing table.
Perhaps you could fake it by hacking around with vrf's or something..


> I can't just set a static null route for the /24, because that would
> screw up all traffic going to that subnet through that switch.

Can you set a static that points to the correct next-hop?
The problem is the router would be advertising a route to a
destination that it doesn't actually know about.
I can see what your trying to do, but is this really a good practise?


> I can't just pull the EIGRP summary at the boundary without causing all
> sorts of other fun.

Is the problem that when you try to summarise to /24 and /16, the /16
blocks the /24 ?
You should be able to do both - it would still be legal - I think this
is what you need to investigate further.
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