Redundant Operation In The 8-Slot Chassis And 16-Slot Chassis - 3Com 3CB9E7 - CoreBuilder 9000 Chassis Switch Getting Started Manual

Redundant Operation in the 8-slot Chassis and
16-slot Chassis
You can install two switch fabric modules in an 8-slot
chassis and a 16-slot chassis to provide redundancy
for the CoreBuilder 9000 Enterprise Switch. The
secondary (standby) switch fabric module mirrors all
configuration and operation parameters of the
primary (active) switch fabric module. If a problem
occurs with the primary module, the system software
immediately switches to the secondary module,
keeping the network up and running.
A switch fabric module becomes the primary switch
under the following conditions:
It is the only switch fabric module in the chassis.
It has a lower slot number, and the other switch
fabric module is not primary or is in a primary
transition state.
The original primary switch fabric module fails.
A second switch fabric module becomes the
secondary switch under the following conditions:
The other switch fabric module is already the
primary switch.
The other switch fabric module is installed in the
lower slot of the chassis.
Switch Fabric Modules
For the 8-slot chassis, you must install a switch fabric
module in the specific slot in which all switch port
connections meet. In the CoreBuilder 9000 Enterprise
Switch 8-slot chassis, slot 7 and slot 8 are dedicated
to the Gigabit Ethernet or ATM switch fabric module;
slot 7 holds the active module and slot 8 holds the
redundant module. The switch fabric module provides
connectivity between several groups of ports
simultaneously.
For the 16-slot chassis, you must install a switch fabric
module in the specific slot in which all switch port
connections meet.
In the CoreBuilder 9000 Enterprise Switch 16-slot
chassis, slot 8 and slot 9 are dedicated to the Gigabit
Ethernet or ATM switch fabric module; slot 8 holds
the active module and slot 9 holds the redundant
module. The switch fabric module provides
connectivity between several groups of ports
simultaneously.
After you reset the chassis, the switch fabric module
in slot 8 of the 8-slot chassis and in slot 9 of the
16-slot chassis becomes the primary switch fabric
module.
Because Gigabit Ethernet switch fabric modules and
ATM switch fabric modules are the core switching
engine of the CoreBuilder 9000 Enterprise Switch,
they require priority for power and management. The
modules control and monitor passive backplane,
Gigabit Ethernet, and ATM activity.
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