BGP sample configuration guide

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BGP sample configuration guide - Cisco

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Here is the BGP configurations for any possible combination of link layout for BGP. One of case in below chat should be match with your current network layout or your network want to be.

Cases	ISP "A" (Line /Router)	ISP "B" (Line /Router)	Uer's Router	IGP/HSRP/NAT	Key Point
Case 1-1	(1/1)	-	1	no/no/no	> Basic BGP with default route
Case 1-2	(1/1)	-	1	no/no/no	> Basic BGP with Metric
Case 1-3	(1/1)	-	1	no/no/no	> Basic BGP with AS prepand
Case 1-4	(1/1)	-	1	no/no/no	> Basic BGP with Community String
Case 1-5	(1/1)	-	1	EIGRP/no/no	> Basic BGP with IGP/EIGRP
Case 1-6	(1/1)	-	1	IBGP/no/no	> Basic BGP with IGP/iBGP
Case 1-7	(1/1)	-	1	no/no/Yes	> Basic BGP with NAT
Case 1-8	(1/1)	-	1	no/no/no	> Basic Multi-hop eBGP
Case 2-1	(2/1)	-	1	no/no/no	> Multi-hop eBGP with load-sharing
Case 2-2	(2/1)	-	1	no/no/no	> Multi-hop eBGP with Community String
Case 3-1	(2/2)	-	1	no/no/no	> Shadow/Fail-over/Local-pref
Case 3-2	(2/2)	-	1	no/no/no	> Dual WAN/Fail-over/AS prepand
Case 3-3	(2/2)	-	1	no/no/no	> Dual WAN/Community String
Case 4-1	(1/1)	(1/1)	1	no/no/no	> Dual homed/AS prepand
Case 4-2	(1/1)	(1/1)	1	no/no/no	> Dual homed/Community String
Case 4-3	(2/2)	-	2	no/HSRP/no	> Dual homed/AS prepand
Case 4-4	(2/2)	-	2	no/HSRP/no	> Dual homed/Community String
Case 5-1	(1/1)	(1/1)	2	no/HSRP/no	> Dual homed/AS prepand
Case 5-2	(1/1)	(1/1)	2	no/HSRP/no	> Dual homed/Community String
Case 6-3	(1/1)	(1/1)	2	EIGRP/no/no	> AS prepand
Case 6-4	(1/1)	(1/1)	2	OSPF/no/no	> AS prepand