Allied Telesis BGP4, VERSION 5.4.3-2.6 manual Configuring a BGP Route Reflector

BGP and BGP4+ Configuration

Configuring a BGP Route Reflector

Use a BGP Route Reflector to reduce the iBGP mesh inside an AS. In this example, Peer 2, Peer 5 and Peer 4 would have to maintain a full mesh among themselves but by making Peer 5 the Route Reflector, Peer 2 (Client1) has an iBGP session with the Route Reflector only and not with Peer 4 (Client 2).

The routes learned from Peer 2 are advertised to the other clients and to iBGP peers outside the cluster; the iBGP routes learned from iBGP peers outside the cluster are advertised to Peer 2. This reduces the iBGP peer connections in AS1.

AS1

Peer 1	Peer 4
	RR Client 2

10.10.11.50	Peer 6
10.10.11.10

Peer 2	10.10.10.50	10.10.10.10
RR Client 1

		Peer 5
		Route Reflector
	Peer 3
		bgp_4
Route Reflector (Peer 5)
	awplus#	Enter the Global Configuration mode.
	configure terminal
	awplus(config)#	Define the BGP routing process. The number 1 specifies
	router bgp 1
		the AS number of Peer 5.
awplus(config-router)#		Define BGP neighbors. 10.10.10.50 is the IP address
neighbor 10.10.10.50 remote-as 1
		of one of the neighbors (Peer 2) and 1 is the neighbor’s
		AS number.
awplus(config-router)#		Configure Peer 5 as the Route-Reflector (RR) and
neighbor 10.10.10.50 route-reflector
	client	neighbor Peer 2 as its client.
awplus(config-router)#		Define BGP neighbor. 10.10.11.50 is the IP address of
neighbor 10.10.11.50 remote-as 1		one of the neighbors (Peer 4) and 1 is the neighbor’s AS
		number.

	Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
2.6	AlliedWare PlusTM Operating System - Software Version 5.4.3-2.6	C613-50032-01 REV D