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Chapter 1
Cajun P550R/P880/P882 Switch User Guide
■
Under-subscribed switching fabric in most configurations
(two connections per I/O module slot, plus one for the
supervisor module).
■ Single copy replication - Input frames destined for output
multiple switch ports pass through the crossbar only once
and are copied by the crossbar to each destination.
■ Hardware-assisted multicast pruning - The switch only
forwards to appropriate destination switch ports
50-Series Modules
The Cajun P550/P880/P882 switches support the following
50-Series modules:
■ Layer 2 Supervisor Module
■ Layer 3 Supervisor Module
■ Layer 2 and Layer 3 Fast Ethernet Modules
■ Layer 2 and Layer 3 Gigabit-Speed Modules
■ ATM Uplink Module
The layer 2 and layer 3 media modules implement wire speed
routing and bridging in Application-Specific Integrated Circuits
(ASICs). One set of ASICs supports a gigabit-per-second’s worth of
traffic (any combination of layer 2 and layer 3 modules). The
routing and bridging ASICs can process 1.5 million packets per
second, which is just slightly more than a gigabit’s worth of
minimum-sized Ethernet frames.
* Note: All layer 3 modules interoperate with the layer 2
modules and require the layer 3 supervisor module.
The layer 2 and layer 3 supervisor modules are both responsible for
learning addresses, and managing the address cache and the
Spanning Tree Protocol (STP).
The ATM Uplink module provides LAN Emulation (LANE)
connectivity over an ATM network.
Layer 2
Supervisor
Module
The layer 2 supervisor module provides the following features:
■ Learns addresses