[cisco-voip] CM 5.x database replication

Fri Mar 14 14:21:26 EDT 2008

Two things to look at.

WAN Considerations
*Delay
The maximum one-way delay between any Unified CM servers for all priority ICCS traffic should not exceed 20 ms, or 40 ms round-trip time (RTT). Delay for other ICCS traffic should be kept reasonable to provide timely database and directory access. Measuring the delay is covered in Delay Testing<http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/5x/50models.html#wp1045925>. 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.

*Every 10,000 busy hour call attempts (BHCA) between sites that are clustered over the WAN requires 900 kbps of bandwidth for Intra-Cluster Communication Signaling (ICCS). This is a minimum bandwidth requirement, and bandwidth is allocated in multiples of 900 kbps. The ICCS traffic types are classified as either priority or best-effort. Priority ICCS traffic is marked with IP Precedence 3 (DSCP 24 or PHB CS3). Best-effort ICCS traffic is marked with IP Precedence 0 (DSCP 0 or PHB BE).

*The minimum recommended bandwidth between sites that are clustered over the WAN is 1.544 Mbps. This amount allows for the minimum of 900 kbps for ICCS and 644 kbps for database and other inter-server traffic.

And that is not counting actual Voice traffic

For more info.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/5x/50models.html#wp1045846

Jorge Rodríguez Aguila
CCNA,CCVP
Senior Network Consultant
Netxar Technologies
jorge.rodriguez at netxar.com
Office 787-765-0058
PCS 787-688-8530
[cid:image004.png at 01C885DE.B01BB960]

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Friday, March 14, 2008 12:46 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] CM 5.x database replication

Dear all;

I have a problem with CM 5.x, I have two servers clustered over the WAN (1 Mbps connection WAN) and I had a problem on the subscibers as the phones registered with it has different old DNs and I checked this and the conclusion was that the Sub server has a DB image completely different from the one on the Pub.

I want to rebuild the DB on the sub from scratch, anyway other than installing the Sub server allover again to do so??

Below is the output of the show perf query

On the Publisher:

admin:Show perf query class "Number of Replicates Created and State of Replication"
==>query class :
- Perf class (Number of Replicates Created and State of Replication) has instances and values:
ReplicateCount -> Number of Replicates Created = 348
ReplicateCount -> Replicate_State = 2

On the Subscriber:

admin:Show perf query class "Number of Replicates Created and State of Replication"
==>query class :
 - Perf class (Number of Replicates Created and State of Replication) has instances and values:
    ReplicateCount  -> Number of Replicates Created   = 0
    ReplicateCount  -> Replicate_State                = 0

Any ideas???!!!!

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