Nortel Networks 43W7774 manual Cfg/l3/bgp, Border Gateway Protocol Configuration, Peer peer number

Alteon OS Command Reference

/cfg/l3/bgp

Border Gateway Protocol Configuration

[Border Gateway		Protocol Menu]
peer	-	Peer menu
aggr	-	Aggregation menu
as	-	Set Autonomous System (AS) number
pref	-	Set Local Preference
on	-	Globally turn BGP ON
off	-	Globally turn BGP OFF
cur	-	Display current BGP configuration

Border Gateway Protocol (BGP) is an Internet protocol that enables routers on a network to share routing information with each other and advertise information about the segments of the IP address space they can access within their network with routers on external networks. BGP allows you to decide what is the “best” route for a packet to take from your network to a desti- nation on another network, rather than simply setting a default route from your border router(s) to your upstream provider(s). You can configure BGP either within an autonomous system or between different autonomous systems. When run within an autonomous system, it's called internal BGP (iBGP). When run between different autonomous systems, it's called external BGP (eBGP). BGP is defined in RFC 1771.

The BGP Menu enables you to configure the switch to receive routes and to advertise static routes, fixed routes and virtual server IP addresses with other internal and external routers. In the current Alteon OS implementation, the GbE Switch Module does not advertise BGP routes that are learned from other BGP “speakers”.

The BGP menu option is turned off by default.

NOTE – Fixed routes are subnet routes. There is one fixed route per IP interface.

Table 6-75Border Gateway Protocol Menu (/cfg/l3/bgp)

Command Syntax and Usage

peer <peer number (1-16)>

Displays the menu used to configure each BGP peer. Each border router, within an autonomous system, exchanges routing information with routers on other external networks. To view menu options, see page 278.

aggr <aggregate number (1-16)>

Displays the Aggregation Menu. To view menu options, see page 281.

276 „ The Configuration Menu 43W7774, May 2007