Which Cisco Unified Communications Manager deployment model for clustering over the IP WAN mandates a primary and a backup subscriber at the same site?
Click on the arrows to vote for the correct answer
A. B. C. D. E.C.
Clustering Over the IP WAN - You may deploy a single Unified CM cluster across multiple sites that are connected by an IP WAN with QoS features enabled.
This section provides a brief overview of clustering over the WAN.
For further information, refer to the chapter on Call Processing.
Clustering over the WAN can support two types of deployments: Local Failover Deployment Model - Local failover requires that you place the Unified CM subscriber and backup servers at the same site, with no WAN between them.
This type of deployment is ideal for two to four sites with Unified CM.
Remote Failover Deployment Model Remote failover allows you to deploy primary and backup call processing servers split across the WAN.
Using this type of deployment, you may have up to eight sites with Unified CM subscribers being backed up by Unified CM subscribers at another site.
References: http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/4x/42models.html.
The Cisco Unified Communications Manager (CUCM) is an enterprise call control platform that provides voice, video, messaging, and mobility services. CUCM clustering over the IP WAN is a deployment model in which multiple CUCM servers are connected over a Wide Area Network (WAN) to provide a single, cohesive telephony system across multiple geographical locations. In this model, each site typically has a primary subscriber and a backup subscriber to ensure high availability of the system.
The question asks for the clustering over the IP WAN deployment model that mandates a primary and a backup subscriber at the same site. Let's review the available options:
A. Multisite with centralized call processing: In this deployment model, all call processing functions are centralized at a single site, and remote sites use a centralized WAN connection to communicate with the CUCM. This model does not mandate a primary and a backup subscriber at the same site.
B. Multisite with distributed call processing: In this deployment model, call processing functions are distributed across multiple sites, with each site having its own CUCM server. This model does not mandate a primary and a backup subscriber at the same site.
C. Local failover: In this deployment model, a primary and a backup subscriber are installed at the same site, with the backup server taking over call processing in case the primary server fails. This is the model that mandates a primary and a backup subscriber at the same site, as required by the question.
D. Remote failover: In this deployment model, a primary and a backup subscriber are installed at different sites, with the backup server taking over call processing in case the primary server fails. This model does not mandate a primary and a backup subscriber at the same site.
E. Remote failover with Cisco Unified Communications Manager Express as SRST: This deployment model is a variation of the remote failover model, where Cisco Unified Communications Manager Express (CUCME) is used as the Survivable Remote Site Telephony (SRST) solution to provide call processing functions in case of a WAN failure. This model does not mandate a primary and a backup subscriber at the same site.
Therefore, the correct answer is option C: local failover.