[nsp] bgp - aggregates and specific routes

[Hudson Delbert J Contr 61 CS/SCBN]

CORRECT...


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# delbert.hudson at losangeles.af.mil #
#        61cs/scbn, 3-0182         #
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-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of james edwards
Sent: Wednesday, July 14, 2004 12:30 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [nsp] bgp - aggregates and specific routes


> I disagree.  While yes the /24 is more specific we are only advertising 
> our aggregate /19 to upstream providers.  If the eBGP link between us 
> and our downstream customer, using our numbers, goes down  connectivity 
> will appear to normal because the /19 is still shown as up.

You can disagree, but routing cares less what you think !

The customer is multihomed ? So if this /24 is withdrawn as you 
no longer hear it and then advertise it, this /24 announcement advertised
via the customers other transit connection will become preferred. It will
overrule your aggregate announcement. Always.

-- 
James H. Edwards
Routing and Security Administrator
At the Santa Fe Office: Internet at Cyber Mesa
jamesh at cybermesa.com
noc at cybermesa.com
(505) 795-7101


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