4.7 优选从EBGP邻居学习到的路由

图片[1]-4.7 优选从EBGP邻居学习到的路由-大赛人网
图4-7  优选从EBGP邻居学习到的路由网络拓扑

1.R1配置OSPF

[R1]ospf 1 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 12.1.1.0 0.255.255.255

2.R2配置OSPF

[R2]ospf 1 router-id 2.2.2.2
[R2-ospf-1]area 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IBGP、EBGP

[R1]bgp 12
[R1-bgp]router-id 1.1.1.1
[R1-bgp]peer 2.2.2.2 as-number 12
[R1-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[R1-bgp]peer 2.2.2.2 next-hop-local
[R1-bgp]peer 13.1.1.3 as-number 300

4.R2配置IBGP、EBGP

[R2]bgp 12
[R2-bgp]router-id 2.2.2.2 
[R2-bgp]peer 1.1.1.1 as-number 12
[R2-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[R2-bgp]peer 1.1.1.1 next-hop-local
[R2-bgp]peer 23.1.1.3 as-number 300

5.R3配置EBGP,宣告3.3.3.3/32到BGP

[R3]bgp 300
[R3-bgp]router-id 3.3.3.3
[R3-bgp]peer 13.1.1.1 as-number 12
[R3-bgp]peer 23.1.1.2 as-number 12
[R3-bgp]network 3.3.3.3 32

6.R1、R2查看BGP路由

不优选的原因是not preferred for peer type,peer两种类型:IBGP、EBGP,EBGP>IBGP
<R1>display bgp routing-table 
 *>   3.3.3.3/32         13.1.1.3        0                     0      300i
 * i                     2.2.2.2         0          100        0      300i

<R2>display bgp routing-table
 *>   3.3.3.3/32         23.1.1.3        0                     0      300i
 * i                     1.1.1.1         0          100        0      300i

<R2>display bgp routing-table 3.3.3.3
 BGP local router ID : 2.2.2.2
 Local AS number : 12
 Paths:   2 available, 1 best, 1 select
 BGP routing table entry information of 3.3.3.3/32:
 From: 23.1.1.3 (3.3.3.3)
 Route Duration: 00h12m10s  
 Direct Out-interface: GigabitEthernet0/0/1
 Original nexthop: 23.1.1.3
 Qos information : 0x0
 AS-path 300, origin igp, MED 0, pref-val 0, valid, external, best, select, active, pre 255
 Advertised to such 1 peers:
    1.1.1.1
 BGP routing table entry information of 3.3.3.3/32:
 From: 1.1.1.1 (1.1.1.1)
 Route Duration: 00h11m05s  
 Relay IP Nexthop: 12.1.1.1
 Relay IP Out-Interface: GigabitEthernet0/0/0
 Original nexthop: 1.1.1.1
 Qos information : 0x0
 AS-path 300, origin igp, MED 0, localpref 100, pref-val 0, valid, internal, pre 255, IGP cost 1, not preferred for peer type
 Not advertised to any peer yet
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