GTM and DSC Sync-Failover with more than two members

Correct. This can be handled with a GTM sync group. It will only synchronize GTM specific object configurations. We currently have eight GTMs in a sync group and subsets of them are also in active-standby LTM pairs.

 

http://support.f5.com/kb/en-us/solutions/public/13000/700/sol13734.html

 

As Cory mentioned DSC is not to be confused with a GTM sync groups. In your configuration you want to build out your GTM sync group to include all devices licensed with GTM. Keep in mind that all GTM's in a sync group are active. This is done by performing BIGIP_ADD and GTM_ADD between all of your GTM devices.

 

The sync group's configuration will reference your LTM virtual servers which will be hosted by whatever LTM device is currently active.

 

For more information see the GTM implementation manual:

 

http://support.f5.com/kb/en-us/products/big-ip_gtm/manuals/product/gtm-implementations-11-1-0/15.html

 

I guess I wasn't clear. The GTM sync group is not where my problem is, that part is clear enough to me. The problem is that the LTMs are in a Sync-Failover group with more than two members. When I go into BigIP > DNS > GSLB > Servers > Create, I get a drop down for BigIP (Single) and BigIP (Redundant). The BigIP (Redundant) only allows a single peer. So do I put all four traffic groups in as BigIP (Single) and use the floating IP for each traffic group? Or should I put in two LTMs in as BigIP (Redundant) and use the non-floating IPs? If the latter, how will the GTM handle a traffic group floating from one to the other pair?

Greetings, Both single and redundant appear to let you enter multiple IP addresses. I don't think either really matters. Here's what I came up with. Oh, you can modify the device names for better tracking too:

 tmsh
 list gtm server
gtm server multi_server {
    addresses {
        10.12.23.139 {
            device-name multi_server
        }
        10.12.23.140 {
            device-name multi_server
        }
        10.12.23.141 {
            device-name multi_server
        }
        10.12.23.142 {
            device-name multi_server
        }

 modify gtm server multi_server addresses modify { 10.12.23.139 { device-name multi_one }}
 modify gtm server multi_server addresses modify { 10.12.23.140 { device-name multi_two }}
 modify gtm server multi_server addresses modify { 10.12.23.141 { device-name multi_three }}
 modify gtm server multi_server addresses modify { 10.12.23.142 { device-name multi_four }}

 list gtm server
gtm server multi_server {
    addresses {
        10.12.23.139 {
            device-name multi_one
        }
        10.12.23.140 {
            device-name multi_two
        }
        10.12.23.141 {
            device-name multi_three
        }
        10.12.23.142 {
            device-name multi_four
        }

There is an RFE in the works (not too distant future) for multiple server objects.

Don't forget to bigip_add each of the servers.

Kevin