Re: routing to 147.73/16

[Linda Winkler <lwinkler () anl gov>]

At SC97, we saw 147.73/16 injected into the vBNS yesterday by DREN.
this caused vBNS sites to traverse the vBNS to SDSC then hop to DREN
to get to SJCC while the vBNS/NTON link into SJ was being worked on.  
this was quite unexpected.
lw

At 08:25 AM 11/19/97 -0800, Ron Broersma wrote:
> Phil,
>
> The subnets you are receiving via your BGP session with DREN support the
DoD  
> HPCMP portions of the net at SC97.  There is a DREN connection to SC97 to  
> support the demonstrations.  Therefore you should reach the DoD HPCMP  
> resources at SC97 via your DREN connection, and the rest of your SC97
traffic  
> should follow the less explicit 147.73/16 path.  DREN is not announcing  
> these subnets to other peers at the exchanges, only to DREN members.
>
> Meanwhile, in response to your message, Tom Kile installed a filter at PLK  
> so you should no longer receive these prefixes via DREN.
>
> --Ron
>
> Begin forwarded message:
>
> To: nanog () merit edu
> Subject: routing to 147.73/16
> Date: Mon, 17 Nov 1997 13:04:07 -0700
> From: Phil Wood <cpw () lanl gov>
> Sender: owner-nanog () merit edu
>
>
> Folks,
>
> If any of you BGP peer with DREN, as we do, you will be getting
> (as part of their AS668) a couple of subnets of 147.73/16:
>
> B    147.240.0.0/16 [5/0] via 138.18.169.1, 01:44:58
>     147.73.0.0/16 is variably subnetted, 2 subnets, 2
>  B       147.73.234.0/28 [5/0] via 138.18.169.1, 01:40:24
>  B       147.73.234.128/27 [5/0] via 138.18.169.1, 01:39:54
>
> This could cause customers visiting SC97 to complain about
> connectivity to their local network from SC97 unless you are also
> receiving routing for the remaining 147.73 space from some other
> peer.
>
> I thought some subset of the nanog population might want to know
> since it caused me a bit of trouble shooting this morning, and nobody
> at DREN is available.
>
> Phil