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7-2 Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1
Chapter
Redundant
Switch
Controller and
Element
The Avaya Multiservice Switch can be configured with a redundant
switch element module and a redundant switch controller module,
for backup of both switch fabric components. In the event of a
failure in a switch element or controller module, the redundant
module will take over the function of the failed component.
Virtual Router
Redundancy
Protocol (VRRP)
The Avaya Multiservice Switch supports Virtual Router Redundancy
Protocol (VRRP), an IETF protocol designed to support redundant
LAN routers, as well as load balancing of traffic. VRRP is transparent
to host end stations. All configurations are done at the Avaya
Multiservice Switch, no additional end station configurations are
required. See the “Virtual Router Redundancy Protocol (VRRP)”
section in Chapter 9, “Configuring IP Routing”, for more details.
Hunt Groups Ports within a Hunt Group by default are redundant to one another
since Hunt Groups perform load balancing among the ports. The
Hunt Group load-shares the traffic between two switches allowing
the bandwidth to be multiplied. The use of Hunt Groups also
increases reliability since the links behave as hot standby links to
one another. If the traffic is shared over multiple links, and one of
the links is "lost", the traffic will be automatically redistributed over
the other links and the communications will continue without
interruption See the “Hunt Groups” section in Chapter 4, “Using
VLANs, Spanning Tree, Hunt Groups, and VTP Snooping” for more
details.
Redundant
Power Supplies
Only two power supplies are required to support a fully-loaded
Avaya Multiservice Switch. A third power supply can be installed to
provide backup should one of the other two fail. The power
subsystem provides N+1 power supply redundancy.
Supervisor
Failover
conditions
The Active supervisor module fails over to the standby supervisor if
one of the following events occur:
— Active Supervisor module removal
— Active Supervisor Software reset
— Active Supervisor Module Reset Push button
— Active Supervisor loses power
— Active Supervisor system crash either hardware or
software