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Chapter 1
Cajun P550R/P880/P882 Switch User Guide
■
Two CoS priority queues that provide flexible queue
management algorithms to meet application requirements.
■ Large buffer space:
— 512KB per gigabit port.
— 128KB additional for outbound 10/100 ports.
• Configurable queue depth for each of two prioritized
packet queues.
• Configurable priority threshold.
• Configurable service ratio tunes queue priority.
Routing Overview
All three switches can be configured as an IP, IPX ,and AppleTalk
router with virtual interfaces. Virtual interfaces are mapped to
physical ports or VLANs. Layer 3 IP traffic is routed between the
virtual interfaces.
Ports become members of VLANs by being assigned or by rules.
Multiple VLANs can share a single trunk port. In contrast, multiple
physical ports can be associated with a single VLAN. In all cases,
traffic that arrives and leaves the same VLAN is bridged, not routed.
This section provides the following sections:
■ Compatibility with the Layer 2 Switch
■ Routing with Layer 2 and Layer 3 Modules
Compatibility with the Layer 2 Switch
Each switch is completely backward compatible with all of the layer
2 media modules that the switch currently supports. Layer 2 traffic
is routed by sending that traffic to the layer 3 supervisor module.
The supervisor module routes all traffic from layer 2 media modules
in software as described in the next section, “"Routing with Layer 2
and Layer 3 Modules"” .
* Note: Layer 2 traffic that does not require routing is bridged
independently of the layer 3 traffic based on the MAC
address or VLAN information.