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In the event of a WAN failure, any IP telephone or media gateway that cannot reach the primary
controlling server can register with an LSP gatekeeper in survivable mode. In the S8700/G700/
G350 configuration, up to 50 LSPs are available and ready for the fail-over process. The LSP
(an S8300 media server running Avaya Communication Manager software) is always ready to
acknowledge service requests from IP telephones and gateways that can no longer
communicate with their main controller. Once the phones and the gateway are registered, end
users at the remote site have full feature functionality. This failover process usually takes less
than 5 minutes. After failover, the remote system is stable and autonomous.
S8300/G700/G350 configuration
In this configuration, the connectivity path between the G700 or G350 Media Gateway and the
S8300 Media Server is:
Endpoint
The link failure discovery and recovery process is the same as above, except there are no
C-LAN addresses in the alternate gatekeeper list. In the S8300/G700/G350 configuration, up to
10 LSPs can back up the media gateways that are controlled by the S8300 Server.
Disaster Recovery and Business Continuity Solution
S8700 Server Separation
S8700 server separation allows the two servers in an S8700 Media Server pair to be
geographically separated up to a maximum distance of 10 kilometers over a fiber-optic link.
Separating the servers offers an improved survivability option by allowing servers to reside in
two different buildings across a campus or small Metropolitan Area Network. This feature
capability is applicable to the S8700 servers in both Multi-Connect and IP-Connect
configurations.
The sever separation feature works best when each server is accompanied by its own Layer 2
Ethernet switch. For example, in a Multi-Connect system, each server would have an Ethernet
switch co-located with it. The two Ethernet switches would be connected using a 100base-FX or
Gigabit Ethernet link. For optimum results, the port networks should also be distributed with
respect to Ethernet switches.
Note: S8700 Server Separation does not provide for separation of duplicated center stage
switch port network connectivity (CSS-PNC) in a critical reliability configuration.
IP Network
S8300 Server
Disaster Recovery and Business Continuity Solution
Issue 3.4.1 June 2005
253
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