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New Member

Delay for Clustering over the WAN (80 or 40 msec)

Cisco Relase notes for CCM 6.1 said that delay between CCM notes should not exceed RTT 40 msec, on the other side SRND said that for version 6.1 RTT was increased to RTT 80 msec.

Wich one is right, SRND or release notes?

4 REPLIES
Cisco Employee

Re: Delay for Clustering over the WAN (80 or 40 msec)

Hi Alejandro,

The SRND is the official design reference. 80ms RTT is true as of CUCM 6.1.

If you can point me to the erroneous Release Note I'll submit a DDTS to have it corrected.

Regards,

Michael.

New Member

Re: Delay for Clustering over the WAN (80 or 40 msec)

Hi Michael:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/install/6_1_1/install/cmins611a-cm.pdf

“If you are installing a cluster or adding a node, verify that the links between servers meet the 40-ms round-trip time (RTT)requirement and that you have enough bandwidth to support database replication.”

Regards

Alex

New Member

Re: Delay for Clustering over the WAN (80 or 40 msec)

Same thing on the installation guide:

Installing Cisco Unified Communications Manager, Release 6.1(1)

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/install/6_1_1/install/cmins611a-cm.pdf

Cisco Employee

Re: Delay for Clustering over the WAN (80 or 40 msec)

Thanks Alex! Based on your input, I've submitted DDTS CSCsq68996 with the documentation team request that the installation docs be updated to reflect that as of CUCM 6.1 the maximum RTT when clustering over a WAN has been relaxed to 80msec, as noted in the SRND.

Thanks again!

Michael.

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