[cisco-voip] CM 4.2 clustering across a wan

[Wes Sisk]

Traffic between the servers should be prioritized. It's all or nothing. 
If cannot meet the requirement do not cluster over wan.

ICCS stricly speaking are only a few ports but we know from experience 
that delays on other ports cause unexpected behavior.  This appears 
innocent enough on initial inspection but I promise there are very 
dangerous pitfalls down this road.

Regards,
Wes

On Wednesday, August 12, 2009 1:54:34 PM , Go0se <me at go0se.com> wrote:
>
> We have a scenario with Callmanager 4.2 -- PUB & SUB separated by MPLS 
> -- plenty of bandwidth but QoS/CoS is our issue. I have a copy of the 
> "Cisco Unified Callmanager 4.2 TCP and UDP Port Usage" guide, but 
> unfortunately due to considerations outside of our control we cannot 
> prioritize by IP nor can we prioritize all of the CM to CM ports 
> listed in the above guide.
>
>  
>
> In the following SRND:
>
>  
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> http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/4x/42models.html#wp1045871
>
>  
>
> under the "WAN Considerations" section (that I linked to in the above 
> link) it discusses ICCS (Intra-Cluster Communication Signaling) 
> between servers. It links to a subsection of "Intra-Cluster 
> Communications" that vaguely lists what communications are involved in 
> ICCS but doesn't discuss actual ports.
>
>  
>
> So basically my issue is this: I'm looking for is a "meat and 
> potatoes" list of the absolute necessary ports to prioritize that must 
> meet the 20 ms delay (40 ms RTT) between intra-cluster callmanager 
> boxes to keep them happy.
>
>  
>
> As always, if anyone can offer guidance/assistance, it would be 
> greatly appreciated.
>
>  
>
> Thanks,
>
>  
>
> Go0se
>
> http://atc.go0se.com
>
>  
>
>  
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>
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