![图片[1]-4.12 优选最低BGP邻居地址路由-大赛人网](https://www.dsrw.com/wp-content/uploads/2023/03/图片1-27.png)
1.R1配置OSPF
[R1]ospf router-id 1.1.1.1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
[R1-ospf-1-area-0.0.0.0]network 1.1.2.1 0.0.0.0
[R1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.255.255.255
2.R2配置OSPF
[R2]ospf 1 router-id 2.2.1.2
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 2.2.1.2 0.0.0.0
[R2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[R2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.255.255.255
3.R1配置BGP
[R1]bgp 12
[R1-bgp]router-id 1.1.1.1
[R1-bgp]peer 2.2.1.2 as-number 12
[R1-bgp]peer 2.2.1.2 connect-interface LoopBack 0
[R1-bgp]peer 2.2.2.2 as-number 12
[R1-bgp]peer 2.2.2.2 connect-interface LoopBack 1
4.R2配置BGP
[R2]bgp 12
[R2-bgp]router-id 2.2.1.2
[R2-bgp]peer 1.1.1.1 as-number 12
[R2-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[R2-bgp]peer 1.1.2.1 as-number 12
[R2-bgp]peer 1.1.2.1 connect-interface LoopBack 1
5.R2宣告2.2.3.2/32到BGP
[R2-bgp]network 2.2.3.2 32
6.R1查看BGP信息,优选具有最小IP地址的路由(2.2.1.2/32)
[R1]display bgp routing-table
*>i 2.2.3.2/32 2.2.1.2 0 100 0 i
* i 2.2.2.2 0 100 0 i
[R1]display bgp routing-table 2.2.3.2
BGP local router ID : 1.1.1.1
Local AS number : 12
Paths: 2 available, 1 best, 1 select
BGP routing table entry information of 2.2.3.2/32:
From: 2.2.1.2 (2.2.1.2)
Route Duration: 00h07m46s
Relay IP Nexthop: 12.1.1.2
Relay IP Out-Interface: GigabitEthernet0/0/0
Original nexthop: 2.2.1.2
Qos information : 0x0
AS-path Nil, origin igp, MED 0, localpref 100, pref-val 0, valid, internal, best, select, active, pre 255, IGP cost 1
Not advertised to any peer yet
BGP routing table entry information of 2.2.3.2/32:
From: 2.2.2.2 (2.2.1.2)
Route Duration: 00h02m47s
Relay IP Nexthop: 12.1.1.2
Relay IP Out-Interface: GigabitEthernet0/0/0
Original nexthop: 2.2.2.2
Qos information : 0x0
AS-path Nil, origin igp, MED 0, localpref 100, pref-val 0, valid, internal, pre 255, IGP cost 1, not preferred for peer address
Not advertised to any peer yet
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