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Basic BGP Tasks

146 Enterasys Xpedition User Reference Manual

The XP BGP Implementation

The XP routing protocol implementation is based on GateD 4.0.3 code

(http://www.gated.org). GateD is a modular software program consisting of core

services, a routing database, and protocol modules supporting multiple routing protocols

(RIP versions 1 and 2, OSPF version 2, BGP version 2 through 4, and Integrated IS-IS).

Since the XP IP routing code is based upon GateD, BGP can also be configured using a

GateD configuration file (gated.conf) instead of the XP Command Line Interface (CLI).

Additionally, even if the XP is configured using the CLI, the gated.conf equivalent can be

displayed by entering the ip-router show configuration-file command at the XP Enable

prompt.

VLANs, interfaces, ACLs, and many other XP configurable entities and functionality can

only be configured using the XP CLI. Therefore, a gated.conf file is dependent upon some

XP CLI configuration.

Basic BGP Tasks

This section describes the basic tasks necessary to configure BGP on the XP. Due to the

abstract nature of BGP, many BGP designs can be extremely complex. For any one BGP

design challenge, there may only be one solution out of many that is relevant to common

practice.

When designing a BGP configuration, it may be prudent to refer to information in RFCs,

Internet drafts, and books about BGP. Some BGP designs may also require the aid of an

experienced BGP network consultant.

Basic BGP configuration involves the following tasks:

• Setting the autonomous system number

• Setting the router ID

• Creating a BGP peer group

• Adding and removing a BGP peer host

• Starting BGP

• Using AS path regular expressions

• Using AS path prepend

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Cabletron Systems SSIM-R8-02 Spécifications Page 166