Hank Nussbacher wrote:
At 09:47 PM 18-10-08 +0500, Masood Ahmad Shah wrote:
I am curious if anyone else uses conditional BGP as a poor man's DRP?
Suppose you have site A with 192.168.1.0/24. The site is connected to 2
upstream ISPs and they have a number of servers at site A. They now
create a DRP site (site B), which is also connected to 2 upstream ISPs
and they create a mirror copy of those servers from site A over at site
B and assign them the *exact* same IP addresses as at site A. They have
the router at site B do conditional BGP, checking to see if it sees
192.168.1.0/24 from the Internet. As soon as it disappears (site A is
gone), site B starts announcing 192.168.1.0/24 to the Internet and all
the DRP servers at site B are suddenly active. Ignoring the syncing of
the servers from site B to site A, what is the downside of such a "poor
mans' DRP solution?
It has possibilities, but consider:
How do you get it to fail back to site A when site A is restored?
How do you protect against a temporary or transient failure?
What mechanism is in place to prevent both sites from being live at the
same time?
I think there should be some form of out-of-band communication between
the two sites to keep things in sync.
--
Jay Hennigan - CCIE #7880 - Network Engineering - [EMAIL PROTECTED]
Impulse Internet Service - http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV
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