Redundancy & Summarization
Harper, Jeff
Jeff.Harper at Suddenlink.com
Fri Aug 21 16:28:32 UTC 2009
Hi Jon,
If I personally saw it, I wouldn't bother since I would assume there would be a method to your madness. ;-)
Jeff
-----Original Message-----
From: Gaynor, Jonathan [mailto:Jonathan.Gaynor at fccc.edu]
Sent: Friday, August 21, 2009 10:58 AM
To: nanog at nanog.org
Subject: Redundancy & Summarization
My institution has a single /16 spread across 2 sites: the lower /17 is
used at site A, the upper /17 at site B. Sites A & B are connected
internally. Currently both sites have their own ISPs and only advertise
their own /17's. For redundancy we proposed that each site advertise
both their own /17 and the whole /16, so that an ISP failure at either
site would trigger traffic from both /17s to reconverge towards the
unaffected location.
My worry/question: will carriers down the line auto-summarize my
advertisements into a single /16, resulting in a 'load sharing' while
both sites are active? If you're a backbone carrier and you saw x.x/16
and x.x/17 (or x.x/16 and x.x.128/17) being advertised from the same
peer would you drop the longer match?
Regards and thanks,
Jon Gaynor, Senior Network Engineer
Fox Chase Cancer Center
(215) 214-4267, jonathan.gaynor at fccc.edu
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