CER Design - 2 CER Groups in a Cluster

[erick_wellnitz]

Hello all,

Hopefully this question has an easy response.

I have three CUCM clusters.  One for general user population, one for UCCX agents and an SME.  The phones registering to the general user CUCM and the UCCX agent cluster share IP subnet ranges.

If I configure CER as two groups (one for each cluster) and cluster the groups, will there be a problem with the IP subnet overlap?  There is no overlap in the dialplan.

Thanks for any advice that can be provided

-E

[erick_wellnitz]

In case anyone else ever runs across a similar situation the answer is:

You can have overlapping IP subnets for two clustered CER groups but you may experience incorrect locations with phones that roam between clusters.  Also, be aware of the following bug:  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvd51691/?rfs=iqvred 

I hope this helps someone.

[wabrown]

Great info, Erick! So it's possible to have two CER groups using identical ERLs associated to identical (or overlapping) subnet ranges, and that won't cause an issue as long as they don't roam between clusters?