topic Re: Expressways 12.5 onwards _cisco-uds query in Collaboration Applications

Expressways 12.5 onwards _cisco-uds query

ravi.pandey — Tue, 19 Apr 2022 04:50:03 GMT

under this guide :Mobile and Remote Access Through Cisco Expressway Deployment Guide (X12.5) - MRA Infrastructure Requirements [Cisco TelePresence Video Communication Server (VCS)] - Cisco
under :Dual Domain without Split DNS

you can see having _cisco-uds records is no more a requirement, so lets say i have 3 cucm clusters discovred under my Exp-C cluster and am homed under one of those cucm clusters, ILS is enabled. With no _cisco-uds record, which CuCM cluster Exp-C will contact for user's home cluster discovery

Re: Expressways 12.5 onwards _cisco-uds query

Roger Kallberg — Tue, 19 Apr 2022 05:25:57 GMT

AFAIK you have to have the _cisco-uds record available in your internal DNS for your clients to reach a UDS server to query for their home cluster and again AFAIK the Exprw-C behaves in the same way, ie it would use this lookup to find a UDS server to ask on behalf of the client what home cluster he/she belongs to.

Re: Expressways 12.5 onwards _cisco-uds query

ravi.pandey — Tue, 19 Apr 2022 05:30:11 GMT

from 12.5 you don't need to have it, it is clearly mentioned , but am curious to know then how it would do home cluster and other service discovery, all the MRA login flows you see on the internet is still from the versions that were old.

By the way, i knew you will be replying 🙂

Local DNS (Internal Domains)

Although we recommend that the local, internal DNS is configured with _cisco-uds._tcp.<domain> SRV records, from X12.5 this is no longer a requirement.

Re: Expressways 12.5 onwards _cisco-uds query

Roger Kallberg — Tue, 19 Apr 2022 05:48:02 GMT

This is going to be a guess on my end. I’d would think that the C would use the list of configured CM nodes and reach out to one of them in a round robin fashion to ask for the home cluster information.

Re: Expressways 12.5 onwards _cisco-uds query

Nithin Eluvathingal — Tue, 19 Apr 2022 09:09:44 GMT

With latest versions For Expressway C to discover CUCM no UDS record is required.

Re: Expressways 12.5 onwards _cisco-uds query

ravi.pandey — Tue, 19 Apr 2022 09:13:25 GMT

Nithin,

that we already have established, am interested in knowing the answer to my original question

lets say i have 3 cucm clusters discovred under my Exp-C cluster and am homed under one of those cucm clusters, ILS is enabled. With no _cisco-uds record, which CuCM cluster Exp-C will contact for user's home cluster discovery

There is not much in the guides about this change.

Also under this jabber guide it says _cisco-uds record is must, which is in contradiction with what is mentioned in the Expressway MRA guide

Planning Guide for Cisco Jabber 12.8 - Service Discovery [Cisco Jabber for Windows] - Cisco look for section under "

Collaboration Edge SRV Record"

Re: Expressways 12.5 onwards _cisco-uds query

Roger Kallberg — Tue, 19 Apr 2022 14:59:46 GMT

The _cisco-uds record is must if you're not always funneling the clients to connect via MRA. That is stated in the document that you referenced in your original post.

Re: Expressways 12.5 onwards _cisco-uds query

ravi.pandey — Tue, 19 Apr 2022 13:58:17 GMT

_cisco-uds now are only required on what kind of authentication you choose when your jabber is on premise. For MRA if you have expressway 12.5 there is no need, this is the change in 12.5

Re: Expressways 12.5 onwards _cisco-uds query

Roger Kallberg — Tue, 19 Apr 2022 18:28:10 GMT

Don't think that I suggested otherwise. Using these install switches are quite rare in my experience, so their somewhat off the norm so to say. If I was unclear somehow please point out where and I'll try my best to give a clearer answer?

Re: Expressways 12.5 onwards _cisco-uds query

ravi.pandey — Tue, 19 Apr 2022 15:44:09 GMT

Point is , so far it is all conjectures. I have a case open with Cisco to push them to get the definite answer. I'll come back when I have something definitive to share.
Roger appreciate your participation as always.

Re: Expressways 12.5 onwards _cisco-uds query

Nithin Eluvathingal — Tue, 19 Apr 2022 18:40:12 GMT

AFAIK for a single cluster only using MRA, _cisco-uds is not required. But for multi-cluster scenarios _cisco-uds record is must.