"CUCM Group Redundancy"

[Zekeria Sammantar]

Hi,

a.)

Group 1 --> CM1, CM2,CM3

Group 2 --> CM2,CM1,CM3

And

b)

Group 1 --> CM1, CM2,CM3

Group 2 --> CM2,CM1,CM3

Group 3 --> CM3,CM1,CM2

Group 4 ---> CM2,CM3,CM1

OR

c.)

Group 1 --> CM1, CM2,CM3

Group 2 --> CM4,CM5,CM6

Which qualify as 1:1 or 1:2 reduancy?

IF the Backup Server is able to handle both Primary Servers failover in a 2:1 model isn't consider a 1:1?

And the word a Backup Server; does it mean a totally idle CUCM or an active Subscriber with enough space to handle a primary call processor failing?

Whats the real difference between a Mega Cluster and Normal Cluster, since they both support 8 Call processor, and the normal cluster only supports 40,000 device, can't I just use 10K OVA with 8 Primary subscriber in a normal Cluster, is the 40,000 a software limit or is the 10k OVA exclusive to a MEGA Cluster?

Thanks.

[Chris Deren · Accepted solution]

Backup server is one that is not set as primary call processor for any devices, so 1:1 redundancy would be as following:

CM1, CM2, CM3

CM4, CM5, CM3/CM6

2:1 example with smallest number of subs

CM1, CM2, CM3

CM3, CM2, CM1

CM2 is backup to CM1 and CM3

mega cluster would have 16 subs, however it is not a standard deployment and requires cisco approval process. It would support 80K devices.

HTH,

Chris