Avaya Communication Server 1000 Installation And Commissioning Manual page 66

Connect PRI Gateway components
Figure 14: Single server port configuration: dual-homing (distributed)
Figure 15: Multiserver port configuration: dual homing (distributed)
typical network configuration for a dual CPU Call Server configuration that supports dual-
homing of both the ELAN and TLAN. Multiple Layer 2 switches are used to ensure there is no
single point of failure. This is the recommended configuration in a dual CPU Call Server
configuration. In this configuration, the Call Server benefits from the dual-homing feature of
the MGC and remains connected to the network even if one of the Layer 2 ELAN subnet
switches fail, therefore avoiding a CPU switchover because of a network outage.
Figure 15: Multiserver port configuration: dual homing (distributed)
Cascading of the MGC network connections is allowed, up to a maximum of two chassis. The
MGCs can be cabled directly without the need for external Layer 2 switches, which is the type
of configuration recommended for a pure TDM solution.
66 Media Gateway 1000E PRI Gateway Installation and Commissioning
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March 2013