[cisco-voip] Question: What version of CUCM extends the RTT window for Wan clustering subscribers.

Fri Mar 14 20:46:09 EDT 2008

Yes.

Prior to Release 6.1 of Unified CM, 900 kbps of bandwidth was required for Intra-Cluster Communications Signaling (ICCS) traffic for 10,000 BHCA between sites that are clustered over the WAN. An additional 644 kbps of bandwidth was required for database and other intra-cluster communication for every remote server. Thus, a minimum of T1 bandwidth was required in deployments with clustering over the WAN to account for ICCS and additional database traffic between Unified CM servers.

•For Unified CM 6.1 and later releases, a minimum of 1.544 Mbps (T1) bandwidth is required for Intra-Cluster Communication Signaling (ICCS) for 10,000 busy hour call attempts (BHCA) between sites that are clustered over the WAN. This is a minimum bandwidth requirement for call control traffic, and it applies to deployments where directory numbers are not shared between sites that are clustered over the WAN. The following equation may be used as a guideline to calculate the bandwidth for more than 10,000 BHCA between non-shared directory numbers at a specific delay:

This is the url to the SRND if you want to keep reading on this since it has changed a bit.

http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cucm/srnd/6x/models.html#wp1044130

Jorge

________________________________
From: Jason Aarons (US) [jason.aarons at us.didata.com]
Sent: Friday, March 14, 2008 8:34 PM
To: Jorge L. Rodriguez Aguila; Grisham, Tom
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Question: What version of CUCM extends the RTT window for Wan clustering subscribers.

But didn’t the minimum bandwidth requirement go up to full 1.54Mbps ?

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jorge L. Rodriguez Aguila
Sent: Friday, March 14, 2008 4:46 PM
To: Grisham, Tom
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Question: What version of CUCM extends the RTT window for Wan clustering subscribers.

Cisco “Relaxed” from 40 to 80 on 6.1

•Delay

The maximum one-way delay between any two Unified CM 6.0 servers should not exceed 20 msec, or 40 msec round-trip time (RTT). Beginning with Cisco Unified CM Release 6.1, the maximum one-way delay between two Unified CM servers can be up to 40 msec, or 80 msec round-trip time. Measuring the delay is covered in Delay Testing<http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cucm/srnd/6x/models.html#wp1044078>. Propagation delay between two sites introduces 6 microseconds per kilometer without any other network delays being considered. This equates to a theoretical maximum distance of approximately 3000 km for 20 ms delay or approximately 1860 miles. These distances are provided only as relative guidelines and in reality will be shorter due to other delay incurred within the network.

Jorge Rodríguez Aguila
CCNA,CCVP
Senior Network Consultant
Netxar Technologies
jorge.rodriguez at netxar.com
Office 787-765-0058
PCS 787-688-8530
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From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Grisham, Tom
Sent: Friday, March 14, 2008 4:22 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Question: What version of CUCM extends the RTT window for Wan clustering subscribers.

Can anyone share in which version of CUCM that the RTT boundaries will be "relaxed" or "extended" between subscribers clustered over the WAN.  It is my understanding that the 40ms boundary was to be adjusted somewhere in the 6.x or 6.1 Linux platforms.

________________________________

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