CallManager Cluster SDLLinkOutofService

[joeharb]

We have 3 servers in our cluster, 2 @ the main office and 1 @ a remote site.  Phones are generally registered to either CCM2 (Sub located @ main office) or CCM3 (located @ remote site).  There is a 100 Mb link between the 2 sites, everything appears to work fine but we have recieved some SDLLinkOutofService, we have one alert yesterday and we also had reports of dropped calls.  The phones that dropped the calls were registered to CCM3 located @ the same site.  From the reports the Phones displayed "Temp Failed", I can understand losing the call if the link failed but that doesn't appear to be the case. 

My main question is if the remote CCM loses connection to the publisher will/can it cause the phones that are registered to it to unregister?  Is there a way I can determine why we are getting the alerts, again it doesn't happen often but we have noticed it more that 5 times over the last 2 weeks.

Thanks,

Joe

[Rob Huffman]

Hi Joe,

Have a read of this thread (not from CSC) with some great details

on this issue from Ryan Ratliff and Wes Sisk from Cisco

http://www.gossamer-threads.com/lists/cisco/nas/107869

Cheers!

Rob

[joeharb]

I have seen that post before in some of my research.  I am still confused on why the phones which are registered locally would go

to Temp Failed.  Could this be caused by a dropped call, say the call was traversing the 100 Mb link and it was

lost would the phone go into this state?

Thanks,

Joe

[Rob Huffman]

Hi Joe,

The phones would go into a "Temp Fail" state when the Subscriber that they are

registered to drops TCP connections to the Publisher. In this scenario the phones will

attempt to register with the next CUCM listed in their Callmanager Group.

We had this exact scenario happening locally due to a sketchy Switchport that the

Subscriber was connected to.

Cheers!

Rob