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Pipeline User’s Guide Preliminary January 30, 1998 5-1

Configuring the Pipeline as a Bridge

This chapter contains the following sections:

Introduction to Ascend bridging

In the Pipeline, bridges are used primarily to provide connectivity for protocols

other than IP and IPX (AppleTalk, for example). They can also be used to join

segments of an IP or IPX network. Because a bridging connection forwards

packets at the hardware address level (link layer), it does not distinguish between

protocol types and it requires no protocol-specific network configuration.

Bridging is very easy to configure and is commonly used to:

• Provide non-routed protocol connectivity with another site

• Link two sites so that their nodes appear to be on the same LAN

• Support protocols that depend on broadcasts to function, such as BOOTP

Be aware that bridges examine all packets on the LAN (called “promiscuous

mode”), so they incur greater processor and memory overhead than routers. On

heavily loaded networks, this increased overhead can result in slower

performance.

Introduction to Ascend bridging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Enabling bridging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Managing the bridge table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

Configuring bridged connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

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Ascend Pipeline Guida Utente Pagina 153