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Chapter 1
Cajun P550R/P880/P882 Switch User Guide
the supervisor module from slot 2 and restart your switch. There is
no need to upgrade the firmware if you are not running redundant
supervisors.
* Note:
■ 16 MB of memory is required on layer 2 supervisor modules.
If you have a P550 switch and the supervisor module is not
configured with 16 MB of memory, you should order one of
the following upgrades:
Model M5500-MEM16 for 16 MB upgrade
Or
Model M5500-MEM32 for 32 MB upgrade
Media Modules
All of the layer 3 media modules have the same general function as the
layer 3 supervisor module except for the following:
■ The number and type of physical interfaces
■ Hardware-based routing and bridging capacity
Bridging and routing are performed on the input side of each media
module. Frames whose destination Media Access Control (MAC)
address is on the same Virtual LAN (VLAN) as the interface on
which they arrived are bridged. Frames that are going from one
VLAN to another are routed. Some frames are both bridged and
routed, as is the case with multicast.
The media module’s features include:
■ IEEE 802.3x full-duplex flow control - This allows the
switch ports to send a pause command before input buffers
overflow. Half-duplex ports support active backpressure
(jamming).
■ VLAN trunking or non-tagged access modes - This
allows the switch ports to interoperate with popular tagged
trunking schemes used by large networking vendors.
■ Priority Queuing and Class of Service - These features
allow you to prioritize traffic between particular stations or
sets of stations to support jitter-sensitive applications.
Supported class of service (CoS) types include the following:
— 3COM PACE CoS