MPLS hub and spoke 实验问题
题目说明：spoke端不能直接通信，必须经过hub端中转，通过hub和spoke端不同的输入输出RT实现，因此上图中，在R3上的任何spoke路由如果没有进入BGP AS300就无法改变RT值，也就无法在R3上直接中转，这里设法使R3向AS 300内的其中一个router通告右侧spoke的路由，再从AS300的另一个router学到这些路由，此题以7.77.7为例，然后改变weight值，让r3优选迂回的路径，从而实现这些spoke路由改变了RT，让另一个spoke可以接受它们。
R1
no ip domain lookup
ip cef
no ipv6 cef
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface Ethernet0/0
ip address 12.1.1.1 255.255.255.0
!
interface Ethernet0/1
ip address 13.1.1.1 255.255.255.0
!
!
router bgp 300
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
neighbor 12.1.1.2 remote-as 300
neighbor 13.1.1.3 remote-as 100
!
-------------------------------------------------------------------
R2:
no ip domain lookup
ip cef
no ipv6 cef
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface Ethernet0/0
ip address 12.1.1.2 255.255.255.0
!
interface Ethernet0/1
ip address 23.1.1.2 255.255.255.0
!
router bgp 300
bgp log-neighbor-changes
network 2.2.2.2 mask 255.255.255.255
neighbor 12.1.1.1 remote-as 300
neighbor 23.1.1.3 remote-as 100
neighbor 23.1.1.3 advertisement-interval 60
!
------------------------------------------------------------------------------
R3:
ip vrf cisco
rd 3:3
route-target export 101:101
route-target import 100:100
!
no ip domain lookup
ip cef
no ipv6 cef
!
mpls label range 300 399
mpls label protocol ldp
!
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface Ethernet0/0
ip vrf forwarding cisco
ip address 13.1.1.3 255.255.255.0
!
interface Ethernet0/1
ip vrf forwarding cisco
ip address 23.1.1.3 255.255.255.0
!
interface Ethernet0/2
ip address 34.1.1.3 255.255.255.0
mpls ip
!
interface Ethernet0/3
ip address 35.1.1.3 255.255.255.0
mpls ip
!
!
router ospf 1
network 3.3.3.3 0.0.0.0 area 0
network 34.1.1.0 0.0.0.255 area 0
network 35.1.1.0 0.0.0.255 area 0
!
router bgp 100
bgp log-neighbor-changes
neighbor 4.4.4.4 remote-as 100
neighbor 4.4.4.4 update-source Loopback0
neighbor 4.4.4.4 next-hop-self
neighbor 5.5.5.5 remote-as 100
neighbor 5.5.5.5 update-source Loopback0
neighbor 5.5.5.5 next-hop-self
!
address-family v4
neighbor 4.4.4.4 activate
neighbor 4.4.4.4 send-community both
neighbor 4.4.4.4 route-reflector-client /*R3是v4的RR*/
neighbor 5.5.5.5 activate
neighbor 5.5.5.5 send-community both
neighbor 5.5.5.5 route-reflector-client
exit-address-family
!
address-family ipv4 vrf cisco
redistribute connected
neighbor 13.1.1.1 remote-as 300
neighbor 13.1.1.1 activate
neighbor 13.1.1.1 allowas-in
neighbor 23.1.1.2 remote-as 300
neighbor 23.1.1.2 activate
neighbor 23.1.1.2 advertisement-interval 60 /*减少路由抖动，在R3上会出现通过R2来的7.7.7.7 时隐时现的现象，增加通告间隔后，条目存在时间更长，原因是通过AS 300的路径更长
neighbor 23.1.1.2 allowas-in/*允许相同的AS条目进入*/
neighbor 23.1.1.2 distribute-list 10 out /*禁止向R2通告关于list 10指定的路由，这里是7.7.7.7，从而让r2从r1学到7.7.7.7后通告给r3，在r3上改变7.7.7.7的权重，使得R3优选通过R2-R1的方式迂回到7.7.7.7
neighbor 23.1.1.2 route-map cisco in /*作用同上*/
exit-address-family
!
access-list 5 permit 7.7.7.7 /*作用同上*/
access-list 10 deny 7.7.7.7 /*作用同上*/
access-list 10 permit any
!
route-map cisco permit 10 /*作用同上*/
match ip address 5
set weight 5
!
route-map cisco permit 20
!
!
mpls ldp router-id Loopback0
----------------------------------------------
R4:
!
!
ip vrf cisco
rd 4:4
route-target export 100:100
route-target import 101:101
!
no ip domain lookup
ip cef
no ipv6 cef
!
mpls label range 400 499
mpls label protocol ldp
!
interface Loopback0
ip address 4.4.4.4 255.255.255.255
!
interface Ethernet0/0
ip address 34.1.1.4 255.255.255.0
mpls ip
!
interface Ethernet0/1
ip vrf forwarding cisco
ip address 47.1.1.4 255.255.255.0
!
router ospf 1
network 4.4.4.4 0.0.0.0 area 0
network 34.1.1.0 0.0.0.255 area 0
!
router bgp 100
bgp log-neighbor-changes
neighbor 3.3.3.3 remote-as 100
neighbor 3.3.3.3 update-source Loopback0
neighbor 3.3.3.3 next-hop-self
!
address-family v4
neighbor 3.3.3.3 activate
neighbor 3.3.3.3 send-community both
exit-address-family
!
address-family ipv4 vrf cisco
redistribute connected
neighbor 47.1.1.7 remote-as 200
neighbor 47.1.1.7 activate
exit-address-family
!
mpls ldp router-id Loopback0
------------------------------------------------------------------
R5:
!
ip vrf cisco
rd 5:5
route-target export 100:100
route-target import 101:101
!
no ip domain lookup
ip cef
no ipv6 cef
!
mpls label range 500 599
mpls label protocol ldp
!
interface Loopback0
ip address 5.5.5.5 255.255.255.255
!
interface Ethernet0/0
ip address 35.1.1.5 255.255.255.0
mpls ip
!
interface Ethernet0/1
ip vrf forwarding cisco
ip address 58.1.1.5 255.255.255.0
!
router ospf 1
network 5.5.5.5 0.0.0.0 area 0
network 35.1.1.0 0.0.0.255 area 0
!
router bgp 100
bgp log-neighbor-changes
neighbor 3.3.3.3 remote-as 100
neighbor 3.3.3.3 update-source Loopback0
neighbor 3.3.3.3 next-hop-self
!
address-family v4
neighbor 3.3.3.3 activate
neighbor 3.3.3.3 send-community both
exit-address-family
!
address-family ipv4 vrf cisco
redistribute connected
neighbor 58.1.1.8 remote-as 400
neighbor 58.1.1.8 activate
exit-address-family
!
mpls ldp router-id Loopback0
-------------------------------------------------------------
R7:
no ip domain lookup
ip cef
no ipv6 cef
!
interface Loopback0
ip address 7.7.7.7 255.255.255.255
!
interface Ethernet0/0
ip address 47.1.1.7 255.255.255.0
!
router bgp 200
bgp log-neighbor-changes
network 7.7.7.7 mask 255.255.255.255
neighbor 47.1.1.4 remote-as 100
----------------------------------------------------------
R8:
no ip domain lookup
ip cef
no ipv6 cef
!
interface Loopback0
ip address 8.8.8.8 255.255.255.255
!
interface Ethernet0/0
ip address 58.1.1.8 255.255.255.0
!
router bgp 400
bgp log-neighbor-changes
network 8.8.8.8 mask 255.255.255.255
neighbor 58.1.1.5 remote-as 100
--------------------------------------------------------
r3的v4路由表
r5的v4路由表
R8成功收到了另一个spoke端的路由
