Forum Discussion
ltp_55848
Oct 11, 2011Nimbostratus
GTM - redundant or single
Hi All,
I'm certain I am overthinking this question, however; according to the GTM configuration guide when defining the Global Traffic Manager as a Server object, the GTM is to be defined either as a single or redundant system.
For an environment consisting of a HA pair of LTM devices, only one of which is licensed with the GTM module, should the GTM be defined as single or redundant?
Additionally, when defining the GTM, should one use the LTM self IP addresses, the GTM listener address, or a separate IP address?
Cheers,
- George_Watkins_Historic F5 AccountIf GTM is only licensed on one of the boxes then it would be a single system. When you're defining the GTM you'll want to use the self-IP address. GTM uses iQuery (UDP/TCP port 4353) to gather and distribute sync group information. Port 4353 should never be accessible from a listener IP unless that listener IP is also a self-IP (most people don't do this). Hope this helps,
- ltp_55848NimbostratusThanks George,
- George_Watkins_Historic F5 AccountIf you are adding the LTM to be monitored by the GTM (and use discovery, etc.) then the LTM would indeed be a redundant system. I'm not sure about using a separate self-IP or if they could use the same as they are querying different information. Try it both ways and post your results.
- ltp_55848NimbostratusThanks George. I was re-reading a section of the GTM Configuration Guide and came across the following:
- ltp_55848NimbostratusShamelessly bumping this thread in the event anyone can clarify how a LTM HA pair with one unit singly licensed for GTM should be added as servers.
- George_Watkins_Historic F5 AccountSorry I wasn't more help.
- ltp_55848NimbostratusThanks George. I've run with the setup you suggested of a separate self-IP address for the GTM although I've had the alternate configuration suggested through the official support channels. Unfortunately, although I'd like to license the second unit, my employer is not able to justify the expense.
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