BGP for disaster recovery site
CHRISTINE.M.BERNS at sargentlundy.com
CHRISTINE.M.BERNS at sargentlundy.com
Mon Sep 29 16:13:09 UTC 2008
We currently have a routable block (class B) of IP addresses. We are in
the process of designing a disaster recovery site. Our main site is
already dual homed to two different Internet service providers via BGP. A
consultant told us that in order to allow us to test access to the DR site
without affecting the production environment, we should get another block
of addresses from ARIN and advertise those addresses out the DR site's
Internet connection. Can we even expect to get another block from ARIN if
we already have a class B, and could we not accomplish the same thing by
advertising a subnet of our existing Class B at the DR site? I would
actually prefer to advertise a subnet of our class B, but am wondering if
there are any reasons why this is not a good idea. Also, I have seen
reference to some Internet service providers possibly not accepting /24
BGP routes and either dropping them or aggregating them to a /21 or /20
or /19. Are there recommendations as to what is the longest prefix
that we should advertise to guarantee that the prefix will be advertised
throughout the Internet?
Chris
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