Traffic redirect toward a backup datacenter

Unanswered Question
Oct 26th, 2009
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Hi,


The customer ask me if there is a way to redirect the traffic going to a datacenter to another backup datacenter when the first is not reachable anymore.

I would use the ACE functionality called "cascade Redirect". Is it correct?

I would like to know if there is another way for that.

Another question is:

What method could it use to achieve a DB synchronization with the lowest difference? We have to remember that there are the MPLS VPN and VPN IPSec connections.

Thank you very much.


Best regards.


Giuseppe.

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Gilles Dufour Mon, 10/26/2009 - 09:14
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Giuseppe,


it also depends on what failure you get.

If the network is down, traffic can't even hit the primaru ACE and therefore it can't redirect it to the backup DC.


One solution is often to use a GSS to answer DNS requests. The GSS can probe the ACE and see if it is alive before responding to the arp request with the correct ACE vserver ip address.


Another solution is the Route Health Injection.

Both sides inject a route in the network through ospf or whatever protocol you use and when an ACE goes down, the network redirect the traffic to the backup site.


Finally, you can also use a redirect on the ACE when all local servers are down but not the network.

For http, this should be a simply http 302 redirect.

For other protocols, you will need to create a rserver representing the backup ace and use it as a backup rserver with client nat.

Not very nice, because traffic will have to go through both sites.


Gilles.

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