网络|BGP邻居建立和通告路由基本配置网络|交换机

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R1:
interface GigabitEthernet0/0/0
ip address 192.168.12.1 255.255.255.0
interface LoopBack0
ip address 1.1.1.1 255.255.255.255
bgp 100 -----------//本端AS号
peer 192.168.12.2 as-number 200 -----------//对端IP地址，对端AS号
ipv4-family unicast
undo synchronization**----------//关闭路由同步**
peer 192.168.12.2 enable
R2:
router id 0.0.0.2
interface GigabitEthernet0/0/0
ip address 192.168.23.2 255.255.255.0
interface GigabitEthernet0/0/1
ip address 192.168.12.2 255.255.255.0
interface LoopBack0
ip address 2.2.2.2 255.255.255.255
bgp 200
peer 192.168.12.1 as-number 100
peer 192.168.23.3 as-number 200
ipv4-family unicast
undo synchronization
network 3.3.3.3 255.255.255.255
import-route static--------------//BGP引入静态路由
import-route ospf 1--------------//BGP引入OSPF路由
peer 192.168.12.1 enable
peer 192.168.23.3 enable
ospf 1
area 0.0.0.0
network 2.2.2.2 0.0.0.0
network 192.168.12.0 0.0.0.255
network 192.168.23.0 0.0.0.255
ip route-static 1.1.1.1 255.255.255.255 192.168.12.1
R3:
router id 0.0.0.3
interface GigabitEthernet0/0/0
ip address 192.168.34.3 255.255.255.0
interface GigabitEthernet0/0/1
ip address 192.168.23.3 255.255.255.0
interface LoopBack0
ip address 3.3.3.3 255.255.255.255
bgp 200
peer 4.4.4.4 as-number 300
peer 4.4.4.4 ebgp-max-hop 2
peer 4.4.4.4 connect-interface LoopBack0
peer 192.168.23.2 as-number 200
【网络|BGP邻居建立和通告路由基本配置】ipv4-family unicast
undo synchronization
import-route static
peer 4.4.4.4 enable
peer 192.168.23.2 enable
ospf 1
area 0.0.0.0
network 3.3.3.3 0.0.0.0
network 192.168.23.0 0.0.0.255
network 192.168.34.0 0.0.0.255
ip route-static 4.4.4.4 255.255.255.255 192.168.34.4
R4:
interface GigabitEthernet0/0/1
ip address 192.168.34.4 255.255.255.0
interface GigabitEthernet0/0/2
interface NULL0
interface LoopBack0
ip address 4.4.4.4 255.255.255.255
bgp 300
peer 3.3.3.3 as-number 200
peer 3.3.3.3 ebgp-max-hop 2
peer 3.3.3.3 connect-interface LoopBack0
ipv4-family unicast
undo synchronization
import-route static
peer 3.3.3.3 enable
ip route-static 3.3.3.3 255.255.255.255 192.168.34.3
验证：
< R1>dis ip routing-table
Route Flags: R - relay, D - download to fib Routing Tables: Public
Destinations : 13 Routes : 13
Destination/Mask Proto Pre Cost Flags NextHop Interface

1.1.1.1/32Direct00D127.0.0.1LoopBack0 2.2.2.2/32EBGP2550D192.168.12.2GigabitEthernet

0/0/0
3.3.3.3/32 EBGP 255 1 D 192.168.12.2 GigabitEthernet
0/0/0
4.4.4.4/32 EBGP 255 0 D 192.168.12.2 GigabitEthernet
0/0/0
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
192.168.12.0/24 Direct 0 0 D 192.168.12.1 GigabitEthernet
0/0/0
192.168.12.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.12.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.23.0/24 EBGP 255 0 D 192.168.12.2 GigabitEthernet
0/0/0
192.168.34.0/24 EBGP 255 2 D 192.168.12.2 GigabitEthernet
0/0/0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
注意：
1、BGP配置邻居关系时peer “对端IP地址”as-number“对端AS好”；
2、BGP配置邻居关系时peer“对端Loopback端口”，需要做指定更新原端口connect-interface‘接口号’，同时还需要路由多跳TTL值，如peer “对端IP地址”ebgp-max-hop “路由跳数”。