/mcpHigh Availability
The Cisco Collaboration on-premises PA provides high availability for all deployed applications by means of the
underlying clustering mechanism present in all Cisco Unified Communications applications.
Clustering replicates the administration and configuration of deployed applications to backup instances of those
applications. If an instance of an application fails, Cisco Unified Communications services—such as endpoint
registration, call processing, messaging, business-to-business communication, and many others—continue to operate
on the remaining instance(s) of the application. This failover process is transparent to the users. In addition to
clustering, the Cisco Collaboration on-premises PA provides high availability through the use of redundant power
supplies, network connectivity, and disk arrays.
Licensing
Details about the individual licenses for the endpoints and infrastructure components in the Cisco Collaboration on-
premises PA are beyond the scope of this document. Information about Cisco Collaboration licensing is available at
https://www.cisco.com/c/en/us/products/unified-communications/collaboration-flex-plan/index.html.
Cisco Catalyst 8000 and Integrated Services Router 4461
The Cisco Catalyst 8200, 8300, and 8Kv (Cat8K) Series and Integrated Services Router (ISR) 4461 provide Wide Area
Network (WAN) and Cisco Unified Communications services in a single platform. In the Cisco Collaboration on-
premises Preferred Architecture, the Cisco Cat8K and ISR 4461 can provide the following functions (Figure 3):
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External connectivity to the Internet
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IP routing and remote-site network services such as DHCP, DNS, NTP, and others
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Cisco Unified Survivable Remote Site Telephony (SRST) to service calls during WAN failures
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Voice gateway to the Public Switched Telephone Network (PSTN), or Cisco Unified Border Element (CUBE) for
Session Initiation Protocol (SIP) trunks
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Integrated data and voice connectivity to service providers
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Multiprotocol Label Switching (MPLS) WAN connectivity for an organization’s network
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Media resources for Cisco Unified Communications Manager (Unified CM)