Cabletron Systems SSIM-R8-02 Spezifikationen PDF herunterladen (Seite 59)

Enterasys Xpedition User Reference Manual 39

Configuring XP Bridging Functions

Configuring Address-based or Flow-based Bridging

The XP ports perform address-based bridging by default but can be configured to perform

flow-based bridging instead of address-based bridging, on a per-port basis. A port cannot

be configured to perform both types of bridging at the same time.

The XP performance is equivalent when performing flow-based bridging or address-

based bridging. However, address-based bridging is more efficient because it requires

fewer table entries while flow-based bridging provides tighter management and control

over bridged traffic.

For example, the following illustration shows an XP with traffic being sent from port A to

port B, port B to port A, port B to port C, and port A to port C.

The corresponding bridge tables for address-based and flow-based bridging are shown

below. As shown, the bridge table contains more information on the traffic patterns when

flow-based bridging is enabled compared to address-based bridging.

With the XP configured in flow-based bridging mode, the network manager has “per

flow” control of layer-2 traffic. The network manager can then apply Quality of Service

(QoS) policies or security filters based on layer-2 traffic flows.

To enable flow-based bridging on a port, enter the following command in Configure

mode.

Address-Based Bridge Table Flow-Based Bridge Table

A (source) A

→ B

B (source) B

→ A

C (destination) B

→ C

Configure a port for flow-based

bridging.

port flow-bridging <port-list>|all-ports

ABC

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Cabletron Systems SSIM-R8-02 Spezifikationen Seite 59