使用SoO可以很好的避免主链路MPLS ×××+备份链路产生的环路

R1：

interface Loopback0

ip address 1.1.1.1 255.255.255.255 ! interface FastEthernet0/0 ip address 12.12.12.1 255.255.255.0 duplex auto speed auto ! interface FastEthernet1/0 ip vrf sitemap soo ip address 14.14.14.1 255.255.255.0 duplex auto speed auto ! router eigrp 1 network 1.1.1.1 0.0.0.0 network 12.12.12.1 0.0.0.0 network 14.14.14.1 0.0.0.0 no auto-summary ! route-map soo permit 10 set extcommunity soo 1:1

 

R2:

ip vrf A

rd 100:1 route-target export 100:1 route-target import 100:1 ! interface Loopback0 ip address 2.2.2.2 255.255.255.255 ! interface FastEthernet0/0 ip vrf forwarding A  ip vrf sitemap soo

ip address 12.12.12.2 255.255.255.0 duplex auto speed auto ! interface FastEthernet1/0 ip address 23.23.23.2 255.255.255.0 duplex auto speed auto mpls ip ! router eigrp 1 network 2.2.2.2 0.0.0.0 network 23.23.23.2 0.0.0.0 no auto-summary ! address-family ipv4 vrf A   redistribute bgp 1 metric 10000 1 255 1 1500   network 12.12.12.2 0.0.0.0   no auto-summary   autonomous-system 1 exit-address-family ! router bgp 1 no synchronization bgp router-id 2.2.2.2 bgp log-neighbor-changes neighbor 3.3.3.3 remote-as 1 neighbor 3.3.3.3 update-source Loopback0 no auto-summary ! address-family ***v4   neighbor 3.3.3.3 activate   neighbor 3.3.3.3 send-community extended exit-address-family ! address-family ipv4 vrf A   redistribute eigrp 1   no synchronization exit-address-family ! route-map soo permit 10

set extcommunity soo 1:1

! mpls ldp router-id Loopback0 force

 

R3：

ip vrf A

rd 100:1 route-target export 100:1 route-target import 100:1 ! interface Loopback0 ip address 3.3.3.3 255.255.255.255 ! interface FastEthernet0/0 ip address 23.23.23.3 255.255.255.0 duplex auto speed auto mpls ip ! interface FastEthernet1/0 ip vrf forwarding A  ip vrf sitemap soo

ip address 34.34.34.3 255.255.255.0 duplex auto speed auto ! router eigrp 1 network 3.3.3.3 0.0.0.0 network 23.23.23.3 0.0.0.0 no auto-summary ! address-family ipv4 vrf A   redistribute bgp 1 metric 10000 1 255 1 1500   network 34.34.34.3 0.0.0.0   no auto-summary   autonomous-system 1 exit-address-family ! router bgp 1 no synchronization bgp router-id 3.3.3.3 bgp log-neighbor-changes neighbor 2.2.2.2 remote-as 1 neighbor 2.2.2.2 update-source Loopback0 no auto-summary ! address-family ***v4   neighbor 2.2.2.2 activate   neighbor 2.2.2.2 send-community extended exit-address-family ! address-family ipv4 vrf A   redistribute eigrp 1   no synchronization exit-address-family ! route-map soo permit 10

set extcommunity soo 1:2

! mpls ldp router-id Loopback0 force

 

R4：

interface Loopback0

ip address 4.4.4.4 255.255.255.255 ! interface FastEthernet0/0 ip address 34.34.34.4 255.255.255.0 duplex auto speed auto ! interface FastEthernet1/0 ip vrf sitemap soo

ip address 14.14.14.4 255.255.255.0 duplex auto speed auto ! router eigrp 1 network 4.4.4.4 0.0.0.0 network 14.14.14.4 0.0.0.0 network 34.34.34.4 0.0.0.0 no auto-summary ! route-map soo permit 10

set extcommunity soo 1:2