网络图：
Site A (.85)----172.24.0.84/30---- (.86)Site B
|(.66) |(.102)
| |
|(172.24.0.64/30) |(172.24.0.100/30)
|(.65) |(.101)
-------------- Site C ---------------
路由器配置和跟踪路由结果：
site_a:
interface FastEthernet0/0
ip address 172.24.0.85 255.255.255.252
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 172.24.0.65 255.255.255.252
duplex auto
speed auto
!
router bgp 900
no synchronization
bgp router-id 172.24.0.65
bgp log-neighbor-changes
network 172.24.0.64 mask 255.255.255.252
network 172.24.0.84 mask 255.255.255.252
timers bgp 1 3
neighbor 172.24.0.66 remote-as 100
neighbor 172.24.0.66 soft-reconfiguration inbound
neighbor 172.24.0.86 remote-as 1200
neighbor 172.24.0.86 soft-reconfiguration inbound
neighbor 172.24.0.86 route-map site_b_only in
no auto-summary
!
ip as-path access-list 1 permit ^[0-9]+_[0-9]+$
!
route-map site_b_only permit 10
match as-path 1
_____________________________________
site_b:
interface FastEthernet0/0
ip address 172.24.0.86 255.255.255.252
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 172.24.0.102 255.255.255.252
duplex auto
speed auto
!
router bgp 1200
no synchronization
bgp router-id 172.24.0.86
bgp log-neighbor-changes
network 172.24.0.84 mask 255.255.255.252
network 172.24.0.100 mask 255.255.255.252
timers bgp 1 3
neighbor 172.24.0.85 remote-as 900
neighbor 172.24.0.85 soft-reconfiguration inbound
neighbor 172.24.0.85 route-map site_a_only in
neighbor 172.24.0.101 remote-as 100
neighbor 172.24.0.101 soft-reconfiguration inbound
no auto-summary
!
ip as-path access-list 1 permit ^900_[0-9]*$
!
route-map site_a_only permit 10
match as-path 1
__________________________________________
site_c:
interface FastEthernet0/0
ip address 172.24.0.66 255.255.255.252
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 172.24.0.101 255.255.255.252
duplex auto
speed auto
!
router bgp 100
no synchronization
bgp router-id 192.168.255.2
bgp log-neighbor-changes
network 172.24.0.64 mask 255.255.255.252
network 172.24.0.100 mask 255.255.255.252
timers bgp 1 3
neighbor 172.24.0.65 remote-as 900
neighbor 172.24.0.65 soft-reconfiguration inbound
neighbor 172.24.0.102 remote-as 1200
neighbor 172.24.0.102 soft-reconfiguration inbound
no auto-summary
_________________________________________________________
site_c#show ip bgp
BGP table version is 4, local router ID is 192.168.255.2
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
* 172.24.0.64/30 172.24.0.65 0 0 900 i
*> 0.0.0.0 0 32768 i
* 172.24.0.84/30 172.24.0.102 0 0 1200 i
*> 172.24.0.65 0 0 900 i
* 172.24.0.100/30 172.24.0.102 0 0 1200 i
*> 0.0.0.0 0 32768 i
site_c#traceroute 172.24.0.85
Type escape sequence to abort.
Tracing the route to 172.24.0.85
1 172.24.0.65 28 msec 16 msec 20 msec
site_c#traceroute 172.24.0.86
Type escape sequence to abort.
Tracing the route to 172.24.0.86
1 172.24.0.65 24 msec 20 msec 24 msec
2 172.24.0.86 [AS 900] 16 msec 36 msec 24 msec
如果流量来自站点 C，我怎么能强制流量不在站点 A 和站点 B 之间路由？我只想要站点 C -> 站点 A、站点 C -> 站点 B；但是站点 A 和站点 B 必须通过它们的 p2p 链接进行通信
如果你检查从站点 C 到 172.24.0.86 的 traceroute 结果，它仍然通过站点 A，这是错误的。
最终部署将在运行 Quagga 的 Linux 下进行，这只是在我的实验室环境中运行 IOS 的模拟。