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edwardwaithaka
Beginner

Server Load-balancing Across Two Data centers on Layer 3

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?

6 REPLIES 6
sesoerensen
Beginner

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

Hi Soren,

The CAS servers will be in two different DCs in two different subnets (L3 hops).

Cesar Roque
Enthusiast

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

---------------------
Cesar R
ANS Team

--------------------- Cesar R ANS Team

Hi Cesar,

I would like to avoid the complexities of policy based routing to avoid asymmetric routing.

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

Hi Ed,

correct, using NAT on the ACE and you won't need PBR

---------------------
Cesar R
ANS Team

--------------------- Cesar R ANS Team
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