IBGP水平分割：从一个IBGP学到的BGP路由不会传到另一个IBGP
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IBGP水平分割：从一个IBGP学到的BGP路由不会传到另一个IBGP
解决办法RR（路由反射器）可以指定他的客户
1、如果一条路由通过客户学习到，那么会反射到客户、非客户、EBGP邻居
2、如果一条路由通过EBGP邻居学习到，那么会反射给客户、非客户、EBGP邻居
3、如果一条路由通过非客户学习到，那么会反射给客户和EBGP邻居，不会反射给非客户R1(config)#int s2/1
R1(config-if)#ip add 12.0.0.1 255.255.255.0
R1(config-if)#no shu
R1(config-if)#int lo0
R1(config-if)#ip add 1.1.1.1 255.255.255.0
R1(config-if)#do ping 12.0.0.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 12.0.0.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/58/96 ms
R1(config-if)#router bgp 100
R1(config-router)#bgp router-id 1.1.1.1
R1(config-router)#nei 12.0.0.2 remote-as 234
R1(config-router)#net 1.1.1.0 mask 255.255.255.0
R1(config-router)#
*Sep 12 19:39:51.659: %BGP-5-ADJCHANGE: neighbor 12.0.0.2 Up
R1(config-router)#do sh ip bgp
BGP table version is 3, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.0/24 0.0.0.0 0 32768 i
*> 5.5.5.0/24 12.0.0.2 0 234 500 i
R1(config-router)#do sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
5.0.0.0/24 is subnetted, 1 subnets
B 5.5.5.0 [20/0] via 12.0.0.2, 00:05:06
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial2/1
R2(config)#int s2/1
R2(config-if)#ip add 12.0.0.2 255.255.255.0
R2(config-if)#no shu
R2(config-if)#int s2/2
R2(config-if)#ip add 23.0.0.2 255.255.255.0
R2(config-if)#no shu
R2(config-if)#do ping 23.0.0.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 23.0.0.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/65/144 ms
R2(config)#router eigrp 90
R2(config-router)#no au
R2(config-router)#net 23.0.0.0 0.0.0.255
R2(config-router)#net 2.2.2.2 0.0.0.0
R2(config-router)#int lo0
R2(config-if)#ip add 2.2.2.2 255.255.255.255
R2(config)#router bgp 234
R2(config-router)#bgp router-id 2.2.2.2
R2(config-router)#no syn
R2(config-router)#no au
R2(config-router)#nei 3.3.3.3 remote-as 234
R2(config-router)#nei 3.3.3.3 up lo0
R2(config-router)#nei 12.0.0.1 remote-as 100
R2(config-router)#
*Sep 12 19:39:54.599: %BGP-5-ADJCHANGE: neighbor 12.0.0.1 Up
R2(config-router)#exit