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Single expressway for different clusters

I need assistant as I want to deploy single expressway MRA for 2 different UC clusters connected over intercluster trunks

What are the restrictions ?

Should the internal domain be identical on both clusters

Should the external domain be identical on both clusters

Should users on different cluster be able to chat each other

Can u provide me with a guide illustrate these points as i found only guide with configuration of same domain internal and external

4 REPLIES 4
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Participant

Hello Ahmed,

 

Yes this is possible to configure single pair of expressway with multiple CUCM clusters.

This is also mentioned in MRA deployment guide under " Multiple Clustered Network Elements"

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-11/Mobile-Remote-Access-via-Expressway-Deployment-Guide-X8-11-4.pdf

 

The things to be noted that-

-both CUCM cluster publishers you need to add on expressway C

- both cluster should be in same domain.

- You need to assign home cluster for users under end user config 

- most important Inter cluster lookup service should be enabled, please see the below link for reference-

https://community.cisco.com/t5/collaboration-voice-and-video/cucm-intercluster-lookup-service-ils-configuration-guide-based/ba-p/3358335

 

Thanks

Please rate if it is helpful....

 

Thanks
Please rate if it is helpful and mark as accepted solution if applicable....
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@Anurag Srivastava1  Thanks for your Reply

Regarding this note( both cluster should be in same domain.)

in our deployment the clusters are in different domain

What is the solution then ?

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Hello Ahmed,

 

In that case whether your users are using same domain for login through MRA? or different domains?
Both ways it is possible.
- If different domains then you should make collab-edge SRV for that (second) domain as well and need to resolve it to your exp-E FQDN or IP.
- Also you need to add that domain in exp-E cert SAN list.
- for different domains you need to add _cisco-uds and _cuplogin in internal DNS for their respective servers/clusters
- You need to add both domains in exp-C
- Also you need to add both CUCM and IM&P clusters in exp-C

I am not sure how many users a single pair can support for MRA, but it should work

 

Thanks.
Please rate if it is helpful..

Thanks
Please rate if it is helpful and mark as accepted solution if applicable....
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Hello, did you implemented this topology? with two or more CUCM clusters, each one with its own domain, sharing the same Expressway pair?

Do you know if it is a supported scenario?

 

Thanks

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