Mailing List Archive: Cisco: VOIP

CCM Cross WAN Clustering

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cj.alan at gmail

Jun 14, 2006, 10:14 AM

Post #1 of 4 (625 views)
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CCM Cross WAN Clustering

Dear All,

>From cisco document, the clustered CCM servers should meet the requirement
of 40ms round-trip time for database replication. In my case, the 2 sites
connected by IPLC with about 50ms. So I did some lab test to make sure it
will be working in my environment. But I found out that even in 200ms
round-trip time lab, the replication is still working!! I'm wondering that
is it a normal case or I misconfigure something. Does anybody have any clue
about this?

Thanks.

Regards,

Alan

Matt.Slaga at us

Jun 14, 2006, 10:35 AM

Post #2 of 4 (582 views)
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Re: CCM Cross WAN Clustering [In reply to]

While it will work, Cisco will not support anything over 40ms. This
gets to be an issue with user response times at the telepad and the
potential for SQL replication issues.

________________________________

From: cisco-voip-bounces [at] puck
[mailto:cisco-voip-bounces [at] puck] On Behalf Of Alan Su
Sent: Wednesday, June 14, 2006 1:15 PM
To: cisco-voip [at] puck
Subject: [cisco-voip] CCM Cross WAN Clustering

Dear All,

From cisco document, the clustered CCM servers should meet the
requirement of 40ms round-trip time for database replication. In my
case, the 2 sites connected by IPLC with about 50ms. So I did some lab
test to make sure it will be working in my environment. But I found out
that even in 200ms round-trip time lab, the replication is still
working!! I'm wondering that is it a normal case or I misconfigure
something. Does anybody have any clue about this?

Thanks.

Regards,

Alan

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CMStaffin at ra

Jun 14, 2006, 11:01 AM

Post #3 of 4 (602 views)
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Re: CCM Cross WAN Clustering [In reply to]

Alan,

The 40ms RTT is due to MS SQL. These are numbers published by MS. In a
lab envirment this will most likely work fine due to very little database
replication and changes. However put 5000 phones on it and there is
considerably more network traffic between servers.

Craig

"Alan Su"
<cj.alan [at] gmail
Sent by: cisco-voip [at] puck
cisco-voip-bounce cc
s [at] puck
Subject
[cisco-voip] CCM Cross WAN
06/14/2006 12:14 Clustering
PM

Dear All,

>From cisco document, the clustered CCM servers should meet the requirement
of 40ms round-trip time for database replication. In my case, the 2 sites
connected by IPLC with about 50ms. So I did some lab test to make sure it
will be working in my environment. But I found out that even in 200ms
round-trip time lab, the replication is still working!! I'm wondering that
is it a normal case or I misconfigure something. Does anybody have any clue
about this?

Thanks.

Regards,

Alan_______________________________________________
cisco-voip mailing list
cisco-voip [at] puck
https://puck.nether.net/mailman/listinfo/cisco-voip

_______________________________________________
cisco-voip mailing list
cisco-voip [at] puck
https://puck.nether.net/mailman/listinfo/cisco-voip

Michael_Davis at eLoyalty

Jun 14, 2006, 7:24 PM

Post #4 of 4 (588 views)
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Re: CCM Cross WAN Clustering [In reply to]

In larger, high volume, or IPCC (Ent) or (Express) environments, there can also be serious issues with CTI Manager as well as call processing synchronization across a slower or unreliable links. Situations where there are devices controlled by a subscriber on one side of the link are talking to devices controlled by different subscribers on the other side of the "slow" link.

I think for this reason, Cisco sets forth the 40ms RTT rule. I've seen situations where a functioning split custer link became over subscribed, resulting in the need for CCM and/or CTIM restarts, Random or all Route Points unregistering, JTAPI failures, etc.

________________________________

From: cisco-voip-bounces [at] puck on behalf of Alan Su
Sent: Wed 6/14/2006 12:14 PM
To: cisco-voip [at] puck
Subject: [cisco-voip] CCM Cross WAN Clustering

Dear All,

>From cisco document, the clustered CCM servers should meet the requirement of 40ms round-trip time for database replication. In my case, the 2 sites connected by IPLC with about 50ms. So I did some lab test to make sure it will be working in my environment. But I found out that even in 200ms round-trip time lab, the replication is still working!! I'm wondering that is it a normal case or I misconfigure something. Does anybody have any clue about this?

Thanks.

Regards,

Alan

_______________________________________________
cisco-voip mailing list
cisco-voip [at] puck
https://puck.nether.net/mailman/listinfo/cisco-voip

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