v6 routing pessimism

[Matthew Davy]

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> Another good idea would be for Abilene to stop sending routes received
> from commercial peers to APAN/KREONET2. When they're at it, they can
> also stop reannouncing routes received from ISPs at PAIX-PA back to
> ISP peers @ PAIX-PA. :-) And finally, Abilene should send only their
> own routes (Abilene's /32 and the connected universities, GigaPOPs,
> research/defense networks etc.) to ISP peers instead of sending a full
> table and relying on the ISP to sort it out with inbound filters.
> The ISPs have a hard time manually filtering that and Abilene's
> communities don't really help there too much last time I checked.
>

Abilene tags the routes it receives directly from commercial peers  
with the 11537:2001 community.    We also block advertisements of  
these routes to other commercial peers by default.     This is a  
recent change (ie within the last couple of months).

We still advertise routes we learn from commercial peers to other  
NRNs and visa versa.    I'll start a discussion internally to see if  
we want to change this as well.     Even if we do this, we still  
can't easily distinguish between commercial vs non-commercial routes  
that we receive from other NRNs so we may still be transiting other  
commercial routes, but this would be a good start.

Also, we tag IPv6 routes we receive through a tunneled interface with  
the 11537:600 community.

You can see a full description of our routing policies and community  
usage at the following URL...

http://www.abilene.iu.edu/bgpcommun.html

- - Matt

Matt Davy
Chief Network Engineer, Indiana University
Abilene Network Operations Center
2711 East 10th Street, Bloomington IN, 47403
mpd at grnoc.iu.edu /  812.855.7728
PGP key fingerprint: A84D DFB6 9DD5 BEB4 1EF7  D713 956F F85C 6422 CBEB

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