Increasing keepalive interval in CCM

Unanswered Question
Oct 23rd, 2008

Any pros and cons of increasing station keepalive interval from 30 seconds to 90 seconds? Can we proceed with increasing the keepalive interval? Do we need to increase it on all CCM nodes in cluster?

If possible please let me know the link to the document supporting this. Thanks in advance

I have this problem too.
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allan.thomas Thu, 10/23/2008 - 01:58

The only real advantage of increasing the keepalive interval is primarily if your network infrastructure exhibits poor utilisation resulting in delays/latency and in worse cases packets drops.

These situations can arise where there is either no QoS provisioned or high latency through low bandwidth links to IP Phones at remote offices in a centralised deployment.

In such circumstances IP Phones will continually alternate between their Primary and Secondary CallManager if keepalives are missed in succession.

Increasing the interval would in my opinion serve as only an interim workaround until these problems can be properly addressed.

The downside is that IP Phones will take significantly longer to failover to another Subscriber and then to failback once their Primary becomes available again.




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