Re: A couple of possibly interesting stats.

[Vince Fuller <]

    A lot of the regional networks have more than one attachment point to
    ANSnet.  Some use one as primary and one as backup.  Most of the
    regional networks announce some of their networks as primary at one
    attachment point and other networks at another attachment point.  This
    means that that regional could not aggregate before reaching ANSnet
    because to do so would mean losing the load balancing.  One longer
    term way around this is to have ANS accept more specific routes plus
    an aggregate and propogate the more specific routes into it's IBGP but
    not propogate them further (just the aggregate).

Is this really a common case? BARRNet has two attachments to ANS/NSFNET, but
they are strictly primary/secondary, so the same aggregates will be advertised
at both locations.

Any network provider which is using multiple ANS/NSFNET connections to split
load should have an addressing plan that assigns a different aggregate to each
exit point. The basic rule is: for each routing policy you have, you should
have different CIDR block. I thought we'd been over this in at least the
Regional Techs forum before.

	--Vince