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Re: Disaster recovery using as-prepend?
From: Andy Davidson <andy () nosignal org>
Date: Thu, 16 Feb 2006 15:04:32 +0000



On 16 Feb 2006, at 14:56, Christopher J. Pilkington wrote:

We have a PI /24 we'd like to advertise out of our primary data center
for production use.  (Well, actually, we'll be advertising a more
specific from our /21 assignment, so already not too friendly... but I
digress.)
[...]
I'm thinking advertising the same prefix and just doing several
as-prepends.  However, now I'm not sure if this is a polite thing to
do or not.

How about advertising all of your PI from all of your perimeter routers, and configuring internal routing to ensure packets get to the rightful live/preferred data centre. Then, in the event of a failover situation, you can change the routing behaviour so that packets for the production /24 end up in the alternative dc.

To work, this does imply you have good connectivity between your live and failover environments (but i guess you have this so that you can copy over state/live data between your two environments anyway..), so that you can carry customer/live data over the link too.

Double plus good for you if you can get cheap transit delivered to your failover dc - you could use this for your preferred environment too !

cheers
-a


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