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Overview of the 8800 Series Modules
Supervisory modules and I/O modules are available. A module consists of a printed circuit
board mounted on a metal panel that acts as the insertion vehicle in the 8800 series
switches. The module carrier also includes ejector/injector levers and captive retaining
screws at each end of the module front panel. LEDs on the module front panel provide
information about the operating status of the modules.
The 8800 series switches support these modules:
8800 Series Supervisory Module XCM88S1
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8800 Series 48-port 10/100/1000 Base-T Module XCM8848T
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8800 Series 24-port 1000Base-X SFP Module XCM8824F
•
8800 Series 8-port 10GBase-XFP Module XCM8808X
•
Supervisory Module
The Supervisory module provides the active switching fabric and CPU control subsystem for
the switch. One Supervisory module is required for switch operation; however, adding a
second Supervisory module to the chassis increases reliability and throughput.
A compact flash slot allows you to insert an external compact flash memory card. (See
External Compact Flash Memory Card
compact flash cards.)
Redundant Supervisory Module Activity
The 8800 series switches can run with a single Supervisory module installed. When you
install an additional Supervisory module, one Supervisory module operates as the primary
Supervisory module and the other becomes the backup (secondary) Supervisory module.
The primary Supervisory module is responsible for upper-layer protocol processing and
system management functions. Packet handling is distributed among the CPUs of all
installed Supervisory modules.
When you save the switch configuration, it is saved to all Supervisory modules.
Selection of the primary Supervisory module occurs automatically. The following examples
describe the selection process:
When a switch boots with two Supervisory modules installed, the Supervisory module in
•
the lower-numbered slot becomes the primary Supervisory module. In the XCM8810
switch this is slot 5; in the XCM8806 switch, this is slot 3.
When a switch boots with a single Supervisory module (regardless of the slot position), it
•
is selected as the primary Supervisory module.
If a second Supervisory module is added to the switch after it has been powered up, the
added Supervisory module becomes the backup Supervisory module. Supervisory
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Chapter 2. 8800 Series Modules
8800 Series Chassis Switch Hardware Installation Guide
on page 9 for more information about supported
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