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Beginner

Switch Pub and Sub for CallManager 12.0

In CUOS Admin. If I go to Settings>IP>Publisher, then change the hostname and IP to my current Sub, will that actually change my current Sub, to the Pub?

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Hall of Fame Cisco Employee

Re: Switch Pub and Sub for CallManager 12.0

what I'm saying is their has to be a way to promote the Sub to Pub

NO, there is NO way

Again, you choose the role of a server upon install, and it will remain a PUB or a SUB for its entire life, no promoting, no switching, no changing, etc.

 

If your scenario happens, you install a new server and DRS to recover your PUB.

HTH

java

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7 REPLIES 7
Hall of Fame Cisco Employee

Re: Switch Pub and Sub for CallManager 12.0

The role of a server is only an option during install, there is no way to swap roles once you have installed a server.

You cannot turn a PUB into a SUB, OR a SUB into a PUB.

HTH

java

if this helps, please rate
Beginner

Re: Switch Pub and Sub for CallManager 12.0

So if I were to shut down the Pub. Change the aforementioned setting on the Sub so it says it is the Pub, then build a new Sub. Would that work? Or do I need to rebuild both servers?
Hall of Fame Cisco Employee

Re: Switch Pub and Sub for CallManager 12.0

OK, it seems you're not familiar with Cisco UC. A cluster can only have ONE publisher, it is the first server that is installed, and it will be the publisher as long as that cluster is in service. Any subsequent server will be a SUB (for as long as the cluster works), and it/they will replicate from the PUB.

One PUB = one cluster

 

I would strongly suggest you read this chapter from the SRND

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab12/collab12/callpros.html

HTH

java

if this helps, please rate
Beginner

Re: Switch Pub and Sub for CallManager 12.0

I know that, what I'm saying is their has to be a way to promote the Sub to Pub. What would happen if the Pub failed? Sub would take over as primary, but then you would need to build a new server. Since the old Pub is dead, wouldn't the previous Sub not become the Pub?
Hall of Fame Cisco Employee

Re: Switch Pub and Sub for CallManager 12.0

what I'm saying is their has to be a way to promote the Sub to Pub

NO, there is NO way

Again, you choose the role of a server upon install, and it will remain a PUB or a SUB for its entire life, no promoting, no switching, no changing, etc.

 

If your scenario happens, you install a new server and DRS to recover your PUB.

HTH

java

if this helps, please rate
Beginner

Re: Switch Pub and Sub for CallManager 12.0

Do you know if the Publisher role is tied to the IP on the server itself?
Hall of Fame Cisco Employee

Re: Switch Pub and Sub for CallManager 12.0

No, IP has nothing to do with the server role.

HTH

java

if this helps, please rate
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