Failover Virtual server Configuration

Product Discussions System
1

Can you please let me know if A10 allows to configuration failover VIP?
For Example:
If i have a Virtual server ABC with backends X1/X2/X3, when all of them goes down, the traffic should be forwarded to a failover site where a different virtual server XYZ. That means XYZ should be configured as a failover virtual server to ABC.

Thanks,
Abhi

2

Hi Abhi, Assuming that the back-end servers X1/X2/X3 are added under a service group. Using aFlex we can check for the active members of the service group and redirect to backup vip if all the servers are Down. Following is the aFlex:


aflex create redirect_if_down
when HTTP_REQUEST {
    if { [active_members example_service_group] < 1 } {
        HTTP::redirect "http://backup.example.com"
    }
}
.

and then bind the aFlex to the vip as shown below: slb virtual-server abc 10.10.10.1 port 80 http service-group example_service_group aflex redirect_if_down Hope this helps. Avinash A. A10 Professional Services Engineer

3

Hello Avinash,

Thank you for the reply, Can you please let me know if this can be done for udp ports?
Both the vip’s in question are udp-514.
Thanks,
Abhi

4

Also, please provide me with the sample script to redirect udp traffic.

5

Redirect will not hold if it is a udp port. In that case i suggest may be add a back-up service-group/server instead of a back-up vip. aFlex:


aflex create back_up_service-group
when CLIENT_ACCEPTED {
    if { [active_members example_service_group] < 1 } {
        pool "back_up_service-group"
		# node "server-ip"
    }
}
.

slb virtual-server abc 10.10.10.1 port 514 udp service-group example_service_group aflex back_up_service-group Let me know if this works. If you need more information , please open a A10 TAC case. Product Support Overview - A10 Support Regards, Avinash A.

6

Thank You Avinash!