CSS11501 - VIP Setup for DR in Active/Active Mode

I have the following request from the Email team:
EXISTING - CSS at Site A (in one-armed mode) supports "webmail" app for the following ports:
- content webmail_http, port 80
- content webmail_https, port 443
- content webmail_imap, port 143
- content webmail_imaps, port 993
- content webmail_pop3s, port 995
NEW - Adding 2nd CSS at Site B support the same app/tcp ports with new servers/mailboxes at site B
Site A & Site B are physically/logically separated by a MAN (behind different WAN/LAN routers/switches, in different IP subnet/vlan).
Want to setup DR in active/active mode, ie. both CSS's at Sites A & B support "webmail" VIP - load sharing.
How would CSS config be setup for this request:
Main VIP - "webmail"
Load sharing between 2 VIP's - "webmail_siteA" & "webmail_siteB" from 2 CSS's at different sites?
Pls help.
Regards,
Diane Ly

Hello Diane
There are 3 different ways to handle an active/active setup - you can use 'VIP and interface redundancy', GSLB on the CSS ,or a GSS and CSS combination.
Vip and interface Redundancy:
http://cco/en/US/products/hw/contnetw/ps792/products_configuration_example09186a00802206a3.shtml
CSS GSLB:
http://cco/en/US/products/hw/contnetw/ps792/products_configuration_example09186a00801dcd75.shtml
GSS/CSS Combo:
There are no direct examples, but in effect, you would have 2 different domains, one for each site. The answers for those domains would be vips and based on both Kal-Ap and rtt from the client to each answer (hence if a site goes down, the client will be directed to the other side.) With this mode, the CSS's can be configured for no redundancy/awareness of eachother at all if that is what is desired.
Kal-Ap-
http://www.cisco.com/en/US/products/hw/contnetw/ps4162/products_configuration_example09186a00801f230e.shtml
On a sidenote, the CSS has a vast technical library with sample configs located here:
http://www.cisco.com/en/US/products/hw/contnetw/ps792/prod_configuration_examples_list.html
Regards,
Chris Higgins

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