03-25-2013 05:24 AM
Hi,
I have a customer who would like to load balance two Microsoft Exchange 2010 CAS Servers which are residing across two data centers.
Which is the best solution for this? Cisco ACE or Cisco ACE GSS or both?
03-25-2013 12:25 PM
Hi Edward,
How are the datacentres interconnected, layer2 or layer3?
As i, are the CAS servers on the same layer2 vlan?
Cheers,
Søren
Sent from Cisco Technical Support iPad App
03-25-2013 09:32 PM
Hi Soren,
The CAS servers will be in two different DCs in two different subnets (L3 hops).
03-25-2013 03:02 PM
Hi Edward,
With the ACE the only thing you need is connectivity between the ACE and the servers. If you can ping the servers from the ACE and viceversa you should not have any problem to loadbalance the traffic
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Cesar R
ANS Team
03-25-2013 09:33 PM
Hi Cesar,
I would like to avoid the complexities of policy based routing to avoid asymmetric routing.
03-26-2013 01:09 AM
I would go with source natting the clients ip addresses, so that return traffic from the servers is routed correctly.
It saves you the trouble with maintaining PBR as well.
Source NAT can be done on the ACE, by applying the configuration to either the load balancing policy, or adding the configuration to the class-map entries in the multi-match policy.
Cheers,
Søren
Sent from Cisco Technical Support iPad App
03-26-2013 10:40 AM
Hi Ed,
correct, using NAT on the ACE and you won't need PBR
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Cesar R
ANS Team
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