[cisco-voip] UCCX 11.6 HA LAN to WAN

[Anthony Holloway]

You shouldn't need TAC to perform the cleanup of the Sub, but it's my
understanding that they already know that the action of deleting the server
is not 100% clean, so they have a command (a script) to run as root to
clean up some left behind entries.  I'd just as soon have them do this, as
it costs you literally nothing, and is a good peace of mind.

As for LAN or WAN, that's really up to you.  For example, do you want the
UCCX Sub to prefer the CUCM Subs in DC2?  If yes, then you *have to* choose
WAN, because that's the only model by which you can specify a different
configuration (like Device Pools) per server.  Choosing LAN locks your Sub
into the same config as your Pub.

Make sure you know the Password Managment passwords, because they don't
sync between servers.

On Fri, Aug 30, 2019 at 9:44 AM Michael Nickolich <
michael.nickolich at gmail.com> wrote:

> Hello all,
>
> We are looking to geographical separate our HA UCCX 11.6.1 nodes, which
> are currently in "data center 1". We will be installing the UCCX Sub at our
> other data center across campus, which is connected by 10Gb fiber. "Data
> Center 2" already has two UCM Subscribers and this is where the UCCX Sub
> will reside. My question is when we install the new Sub, will we select HA
> over LAN or HA over WAN? TAC said it needs to be HA over WAN as the Pub and
> Sub will be on different networks. TAC also said they would need to have
> root access to delete the Sub from the Pub and delete any traces of the old
> Sub. Then add the Sub back to the Pub. The documentation does not mention
> anything about contacting TAC to gain root access for Switching Network
> Deployment from LAN to WAN. Just wondering if their documentation needs
> updated or if the TAC engineer misspoke.
>
> We will be keeping the same hostname for the server. Going to have our Sys
> Admins to lower the TTL on the original record prior to making these
> changes. Once we remove the Sub, have the Sys Admin update the A and PTR
> record to point to the new IP and set TTL back to the default. Then verify
> DNS resolution to the new IP.
> Then install the new UCCX Sub. Still not sure HA over LAN or WAN.
> Then update AXL, JTAPI, and RmCM to include one UCM Sub from data center 2
> in case there is a total outage in data center 1. Currently AXL only has
> the UCM Pub.
>
> Any guidance on any gotchas would be greatly appreciated.
>
> Thanks,
>
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