[cisco-voip] UCCX 11.6 HA LAN to WAN

[Brian Meade]

HA over WAN allows each server to have different configurations for the
Unified CM connection as well as your call control groups.  So you could
have the subscriber connect to a local CUCM subscriber and have different
device pools for those CTI groups to use that local subscriber as well.

I've definitely seen some bugs with HA over WAN in older versions but it
should be pretty stable now.

I've never tried to convert an existing subscriber from LAN to WAN.  There
may indeed be some database references that don't get fully cleaned up when
deleting the subscriber from the publisher.  You would probably have better
luck using a different hostname for the new subscriber.

On Fri, Aug 30, 2019 at 10:45 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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