More sample configuration is visit www.showipbgp.com.
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 |
**Click Case # in above table in order to see an articles
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