Maintain Flow Persistency

[chloi]

Hi, this is my scenario:

I had 2 CSS configured to provide active-backup loadbalancing for ldap service.

i had configure Adaptive Session Redundancy (ASR) for the boxes. My question is:

how can i maintain the persistency of a connection if the backup turn to active unit?

persistency here means that the client need not to form another connection to the server when there is a state transition occur. state transition had to be transparent to the client. The client should be able to continuous sent request to the server without forming another connection.

thanks.

[hdecreis]

Hello,

If you have:

1/ active/passive VIP redun and Virtual Int redun

2/ redundant-index on the services/groups/rules

3/ ISC link between the 2 CSS

then, the persistency of a connection is maintained if the backup turn to active unit (that is, each new connection established on master CSS for a service/group/rule having a redundant-index will be duplicated as dormant flow on backup CSS, allowing "statefull" failover for the configured flows)

see: http://cco.cisco.com/en/US/partner/products/hw/contnetw/ps792/products_configuration_guide_chapter09186a00801577ce.html#wp1032923