CUCM 6.1 cluster accros WAN links

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Sep 18th, 2008
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I was recently told that one of the nice features of 6.1 is that a subscriber node could be place accross a WAN link. I have a two node cluster right now. I'm thinking about adding a third in a backup data center. I would create two CallManager groups and have the both subcribers is each group but is reverse order. Then assign all the remote phones to the remote group and the local phones to the local group. Does this make sense?


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gogasca Thu, 09/18/2008 - 11:11
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In 6.x we add the capability of DB writting in Subscriber IDS databases for user features like (EM, Call Forward, MWI, etc).

We have always had that capability for nodes across the WAN, meeting certain requirements.

in te SRND guide for 6.x you willl find all that info.

and for answering your question it makes sense what you are trying to achieve as long as you meet those requirements.

hypnotoad Thu, 09/18/2008 - 11:27
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Thanks for the speedy reply. I know that earlier version could cross a WAN but I was told early on that the bandwidth requirements were quite high.

I am now under the impression that the bandwidth required is much less for the latest versions.

There is some good info on those SRND docs. I'll read through them and make sure I have the network sized appropriately.


Jon Nelson Thu, 09/18/2008 - 12:47
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You are correct. Clustering over the WAN requirements have been relaxed in version 6.1. The old requirements were 40ms RTT, the new requirements are 80ms RTT.

Thank you,



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