思科BGP路由聚合配置实验案例分析
myway_liang
本文讲述了思科BGP路由聚合配置实验。分享给大家供大家参考，具体如下：
如下图示：
R1:
interface Loopback0
ip address 1.1.1.1 255.255.255.255
interface Loopback11
ip address 11.11.11.1 255.255.255.0
interface Loopback101
ip address 101.1.1.1 255.255.255.0
interface FastEthernet0/0
ip address 12.1.1.1 255.255.255.0
no sh
interface FastEthernet0/1
ip address 13.1.1.1 255.255.255.0
no sh
router ospf 1
network 1.1.1.1 0.0.0.0 area 0
network 12.1.1.0 0.0.0.255 area 0
network 13.1.1.0 0.0.0.255 area 0
router bgp 1
bgp router-id 1.1.1.1
network 11.11.11.0 mask 255.255.255.0
network 101.1.1.0 mask 255.255.255.0
neighbor 2.2.2.2 remote-as 1
neighbor 2.2.2.2 update-source Loopback0
neighbor 3.3.3.3 remote-as 1
neighbor 3.3.3.3 update-source Loopback0
R2:
interface Loopback0
ip address 2.2.2.2 255.255.255.255
interface Loopback22
ip address 22.22.22.2 255.255.255.0
interface FastEthernet0/0
ip address 12.1.1.2 255.255.255.0
no sh
interface FastEthernet0/1
ip address 24.1.1.2 255.255.255.0
no sh
router ospf 1
network 2.2.2.2 0.0.0.0 area 0
network 12.1.1.0 0.0.0.255 area 0
network 24.1.1.0 0.0.0.255 area 0
router bgp 1
bgp router-id 2.2.2.2
network 22.22.22.0 mask 255.255.255.0
neighbor 1.1.1.1 remote-as 1
neighbor 1.1.1.1 update-source Loopback0
neighbor 4.4.4.4 remote-as 4
neighbor 4.4.4.4 ebgp-multihop 255
neighbor 4.4.4.4 update-source Loopback0
R3:
interface Loopback0
ip address 3.3.3.3 255.255.255.255
interface Loopback33
ip address 33.33.33.3 255.255.255.0
interface FastEthernet0/0
ip address 34.1.1.3 255.255.255.0
no sh
interface FastEthernet0/1
ip address 13.1.1.3 255.255.255.0
no sh
router ospf 1
network 3.3.3.3 0.0.0.0 area 0
network 13.1.1.0 0.0.0.255 area 0
network 34.1.1.0 0.0.0.255 area 0
router bgp 1
bgp router-id 3.3.3.3
network 33.33.33.0 mask 255.255.255.0
neighbor 1.1.1.1 remote-as 1
neighbor 1.1.1.1 update-source Loopback0
neighbor 4.4.4.4 remote-as 4
neighbor 4.4.4.4 ebgp-multihop 255
neighbor 4.4.4.4 update-source Loopback0
R4:
interface Loopback0
ip address 4.4.4.4 255.255.255.255
interface Loopback44
ip address 44.44.44.4 255.255.255.0
interface FastEthernet0/0
ip address 34.1.1.4 255.255.255.0
no sh
interface FastEthernet0/1
ip address 24.1.1.4 255.255.255.0
no sh
interface FastEthernet1/0
ip address 45.1.1.4 255.255.255.0
no sh
interface FastEthernet1/1
ip address 46.1.1.4 255.255.255.0
no sh
router ospf 1
network 4.4.4.4 0.0.0.0 area 0
network 24.1.1.0 0.0.0.255 area 0
network 34.1.1.0 0.0.0.255 area 0
network 45.1.1.0 0.0.0.255 area 0
network 46.1.1.0 0.0.0.255 area 0
router bgp 4
bgp router-id 4.4.4.4
network 44.44.44.0 mask 255.255.255.0
//aggregate-address 101.1.0.0 255.255.252.0 as-set summary-only //抑制全部的101.1.0.0/22明细路由，只发汇总路由。（在此实验，这一条命令是多余的。）
neighbor 2.2.2.2 remote-as 1
neighbor 2.2.2.2 ebgp-multihop 255
neighbor 2.2.2.2 update-source Loopback0
neighbor 3.3.3.3 remote-as 1
neighbor 3.3.3.3 ebgp-multihop 255
neighbor 3.3.3.3 update-source Loopback0
neighbor 5.5.5.5 remote-as 5
neighbor 5.5.5.5 ebgp-multihop 255
neighbor 5.5.5.5 update-source Loopback0
neighbor 6.6.6.6 remote-as 6
neighbor 6.6.6.6 ebgp-multihop 255
neighbor 6.6.6.6 update-source Loopback0
access-list 1 permit 101.1.1.0 //以下五行命令是抑制101.1.1.0这个网段不予通告路由。
route-map apple permit 10
match ip address 1
router bgp 4
aggregate-address 101.1.0.0 255.255.252.0 as-set suppress-map apple
R5:
interface Loopback0
ip address 5.5.5.5 255.255.255.255
interface Loopback55
ip address 55.55.55.5 255.255.255.0
interface FastEthernet1/0
ip address 45.1.1.5 255.255.255.0
no sh
router ospf 1
network 5.5.5.5 0.0.0.0 area 0
network 45.1.1.0 0.0.0.255 area 0
router bgp 5
bgp router-id 5.5.5.5
network 55.55.55.0 mask 255.255.255.0
neighbor 4.4.4.4 remote-as 4
neighbor 4.4.4.4 ebgp-multihop 255
neighbor 4.4.4.4 update-source Loopback0
R6:
interface Loopback0
ip address 6.6.6.6 255.255.255.255
interface Loopback66
ip address 66.66.66.6 255.255.255.0
interface Loopback101
ip address 101.1.3.6 255.255.255.0 secondary
ip address 101.1.2.6 255.255.255.0
interface FastEthernet1/1
ip address 46.1.1.6 255.255.255.0
no sh
router ospf 1
network 6.6.6.6 0.0.0.0 area 0
network 46.1.1.0 0.0.0.255 area 0
router bgp 6
bgp router-id 6.6.6.6
network 66.66.66.0 mask 255.255.255.0
network 101.1.2.0 mask 255.255.255.0
network 101.1.3.0 mask 255.255.255.0
neighbor 4.4.4.4 remote-as 4
neighbor 4.4.4.4 ebgp-multihop 255
neighbor 4.4.4.4 update-source Loopback0
R5(config-router)#do show ip bgp
BGP table version is 32, local router ID is 5.5.5.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 11.11.11.0/24 4.4.4.4 0 4 1 i
*> 22.22.22.0/24 4.4.4.4 0 4 1 i
*> 33.33.33.0/24 4.4.4.4 0 4 1 i
*> 44.44.44.0/24 4.4.4.4 0 0 4 i
*> 55.55.55.0/24 0.0.0.0 0 32768 i
*> 66.66.66.0/24 4.4.4.4 0 4 6 i
*> 101.1.0.0/22 4.4.4.4 0 0 4 {1,6} i
*> 101.1.2.0/24 4.4.4.4 0 4 6 i
*> 101.1.3.0/24 4.4.4.4 0 4 6 iR1(config-router)#do show ip bgp
BGP table version is 52, 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, ? - incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 11.11.11.0/24 0.0.0.0 0 32768 i
*>i22.22.22.0/24 2.2.2.2 0 100 0 i
*>i33.33.33.0/24 3.3.3.3 0 100 0 i
* i44.44.44.0/24 4.4.4.4 0 100 0 4 i
*>i 4.4.4.4 0 100 0 4 i
* i55.55.55.0/24 4.4.4.4 0 100 0 4 5 i
*>i 4.4.4.4 0 100 0 4 5 i
* i66.66.66.0/24 4.4.4.4 0 100 0 4 6 i
*>i 4.4.4.4 0 100 0 4 6 i
*> 101.1.1.0/24 0.0.0.0 0 32768 i
* i101.1.2.0/24 4.4.4.4 0 100 0 4 6 i
*>i 4.4.4.4 0 100 0 4 6 i
* i101.1.3.0/24 4.4.4.4 0 100 0 4 6 i
*>i 4.4.4.4 0 100 0 4 6 i
R1(config-router)#do ping 101.1.2.6
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 101.1.2.6, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 44/64/112 ms
增加语句：
R1:
router bgp 1
neighbor 3.3.3.3 route-reflector-client //这两句必须加，否R2和R3不知道对方的存在。
neighbor 2.2.2.2 route-reflector-client