mpls 跨域 optionA 配置实例

注意按照图分别从做到右

R1-R2-R3-R4-R5-R6

(R1-CE1)------(R2-PE1)------(R3-ASBR1)------(R4-ASBR2)-----(R5-PE2)-----(R6-CE2)

|------rip2-----| |------ospf----------| |------------isis--------| |-----ospf------|

跨域的MPLS，这个采用OptionA的方式互联，OptionA是采用VRF-to-VRF的方式，简单的说就是AS之间的ASBR路由器把对方相互看做是CE端，既然是VRF-TO-VRF所以必须为每个VRF创建一个连接，如果有100个VRF就的在域间创建100个VRF的连接，因此该方式的可扩展性有一定的限制，该方式主要的优点是配置和管理简单，为了满足大量的VRF，通常我们采用子接口的形式来实现域间互通。这里是采用最简化的实现方式，剔除了P路由器，呵呵我的小本本不能运行太多的路由器啊，整个PE与CE，PE与PE之间采用OSPF作为IGP协议。具体配置如下：

R1-CE1

hostname R1-CE

interface Loopback0
ip address 1.1.1.1 255.255.255.255

interface Serial1/1
ip address 192.168.0.1 255.255.255.0
serial restart-delay 0

router rip
version 2
network 1.0.0.0
network 192.168.0.0

R2-PE1

hostname R2-PE1

ip vrf test1
rd 1:1
route-target export 1:1
route-target import 1:1

interface Loopback0
ip address 1.1.1.2 255.255.255.255

interface Serial1/0
ip vrf forwarding test1
ip address 192.168.0.2 255.255.255.0
serial restart-delay 0

interface Serial1/1
de.ion To R3-PE2
ip address 10.1.1.1 255.255.255.252
mpls label protocol ldp
tag-switching ip
serial restart-delay 0

router ospf 100
log-adjacency-changes detail
network 1.1.1.2 0.0.0.0 area 0
network 10.1.1.1 0.0.0.0 area 0
!
router rip
version 2
!
address-family ipv4 vrf test1
redistribute bgp 100 metric transparent
network 192.168.0.0
no auto-summary
version 2
exit-address-family
!
router bgp 100
no synchronization
bgp log-neighbor-changes
neighbor 1.1.1.3 remote-as 100
neighbor 1.1.1.3 update-source Loopback0
no auto-summary
!
address-family ***v4
neighbor 1.1.1.3 activate
neighbor 1.1.1.3 send-community both
exit-address-family
!
address-family ipv4 vrf test1
redistribute rip
no auto-summary
no synchronization
exit-address-family

R3-ASBR1

hostname R3-ASBR1

ip vrf test1
rd 1:1
route-target export 1:1
route-target import 1:1

interface Loopback0
ip address 1.1.1.3 255.255.255.255

interface Serial1/0
ip address 10.1.1.2 255.255.255.252
mpls label protocol ldp
tag-switching ip
serial restart-delay 0
!
interface Serial1/1
ip vrf forwarding test1
ip address 192.168.3.1 255.255.255.0

router ospf 100
log-adjacency-changes
network 1.1.1.3 0.0.0.0 area 0
network 10.1.1.2 0.0.0.0 area 0
default-information originate always
!
router bgp 100
no synchronization
bgp log-neighbor-changes
neighbor 1.1.1.2 remote-as 100
neighbor 1.1.1.2 update-source Loopback0
no auto-summary
!
address-family ***v4
neighbor 1.1.1.2 activate
neighbor 1.1.1.2 send-community both
exit-address-family
!
address-family ipv4 vrf test1
redistribute connected
neighbor 192.168.3.2 remote-as 200
neighbor 192.168.3.2 activate
no auto-summary
no synchronization
exit-address-family

R4-ASBR2

hostname R4-PE4

ip vrf test1
rd 1:1
route-target export 1:1
route-target import 1:1

interface Loopback0
ip address 1.1.1.4 255.255.255.255

interface Serial1/1
ip address 10.1.1.9 255.255.255.252
ip router isis cncsz
mpls label protocol ldp
tag-switching ip
serial restart-delay 0

router isis cncsz
net 00.0001.0010.0100.1000.00
is-type level-2-only
passive-interface Loopback0
!
router bgp 200
no synchronization
bgp log-neighbor-changes
neighbor 1.1.1.5 remote-as 200
neighbor 1.1.1.5 update-source Loopback0
no auto-summary
!
address-family ***v4
neighbor 1.1.1.5 activate
neighbor 1.1.1.5 send-community both
exit-address-family
!
address-family ipv4 vrf test1
redistribute connected
neighbor 192.168.3.1 remote-as 100
neighbor 192.168.3.1 activate
neighbor 192.168.3.1 send-community both
no auto-summary
no synchronization
exit-address-family

R5-PE2

hostname R5-PE5

ip vrf test1
rd 1:1
route-target export 1:1
route-target import 1:1

interface Loopback0
ip address 1.1.1.5 255.255.255.255
ip router isis cncsz

interface Serial1/0
ip address 10.1.1.10 255.255.255.252
ip router isis cncsz
mpls label protocol ldp
tag-switching ip
serial restart-delay 0
!
interface Serial1/1
ip vrf forwarding test1
ip address 192.168.2.1 255.255.255.0
serial restart-delay 0

router ospf 1 vrf test1
log-adjacency-changes
redistribute bgp 200 subnets
network 192.168.2.1 0.0.0.0 area 0
!
router isis cncsz
net 00.0001.0010.0100.0002.00
is-type level-2-only
!
router bgp 200
no synchronization
bgp log-neighbor-changes
neighbor 1.1.1.4 remote-as 200
neighbor 1.1.1.4 update-source Loopback0
no auto-summary
!
address-family ***v4
neighbor 1.1.1.4 activate
neighbor 1.1.1.4 send-community both
exit-address-family
!
address-family ipv4 vrf test1
redistribute ospf 1
no auto-summary
no synchronization
exit-address-family

R6-CE2

hostname R6-CE

interface Loopback0
ip address 1.1.1.6 255.255.255.255

interface Serial1/0
ip address 192.168.2.2 255.255.255.0
serial restart-delay 0

router ospf 1
log-adjacency-changes
network 1.1.1.6 0.0.0.0 area 0
network 192.168.2.2 0.0.0.0 area 0

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