Cisco Cisco IP Contact Center Release 4.6.1 Design Guide
11-9
Cisco Unified Contact Center Enterprise 7.0, 7.1, and 7.2 SRND
OL-8669-16
Chapter 11 Sizing Cisco Unified Communications Manager Servers
Unified CM Redundancy
The Cisco MCS-7815 and MCS-7816 servers are not supported with Unified CCE deployments, but lab
or demo setups can use these servers. They are, however, a supported Unified CM platform for
Cisco Unified Communications deployments only.
or demo setups can use these servers. They are, however, a supported Unified CM platform for
Cisco Unified Communications deployments only.
Unified CM Redundancy
With Unified CM, you can choose from the following two redundancy schemes:
•
2:1—For every two primary subscribers, there is one shared backup subscriber.
•
1:1—For every primary subscriber, there is a backup subscriber.
Due to the higher phone usage in contact centers and the increased downtime required during upgrades,
the 2:1 redundancy scheme is not recommended for Unified CM deployments with Unified CCE.
the 2:1 redundancy scheme is not recommended for Unified CM deployments with Unified CCE.
illustrates these two options. This illustration only shows call processing subscribers and
does not show publisher, TFTP, music on hold (MoH), or other servers. For details on additional cluster
deployment and redundancy options, refer to the latest version of the Cisco Unified Communications
Solution Reference Network Design (SRND) Guide, available at
deployment and redundancy options, refer to the latest version of the Cisco Unified Communications
Solution Reference Network Design (SRND) Guide, available at
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_implementation_design_guides
_list.html
_list.html
Figure 11-1
Basic Redundancy Schemes
In
, the five options shown all provide 1:1 subscriber redundancy. Option 1 is used for
clusters supporting fewer than 150 Unified CCE agents. Options 2 through 5 illustrate increasingly
larger clusters. The exact number of servers will depend on the hardware platforms chosen or required,
as determined by the Cisco Unified CM Capacity Tool or the Unified Communications Sizing Tool.
larger clusters. The exact number of servers will depend on the hardware platforms chosen or required,
as determined by the Cisco Unified CM Capacity Tool or the Unified Communications Sizing Tool.
Table 11-2
Capacity When Deploying Only One Unified CM Subscriber Server
Server Type
Maximum Number of Agents
MCS-7825
100
MCS-7835 or MCS-7845
150
126039
M
M
M
M
M
M
M
Cost-efficient redundancy
Degraded service during upgrades
Not Recommended
Backup
Backup
Backup
2:1 REDUNDANCY SCHEME
1:1 REDUNDANCY SCHEME
High availability during upgrades
Simplified configuration