为了进一步了解BGP/MPLS ×××，先搭建一个MPLS Lab。

 
实验步骤：
1、准备P-network
1.1配置接口和IGP
1.2定义×××
1.3配置PE-PE的路由会话
1.4配置PE-CE的路由会话

2、配置CE路由器

1.1配置接口和IGP
router P

!
ip cef

!
interface Loopback0
ip address 1.1.1.1 255.255.255.255

!
interface Serial1/0
ip unnumbered Loopback0
mpls ip

!
interface Serial1/1
ip unnumbered Loopback0
mpls

!
router ospf 1
log-adjacency-changes
network 1.1.1.1 0.0.0.0 area 0

Router PEA

!
ip cef

!
interface Loopback0
ip address 1.1.1.2 255.255.255.255

!
interface Serial1/1
ip unnumbered Loopback0
mpls ip

!
router ospf 1
log-adjacency-changes
network 1.1.1.2 0.0.0.0 area 0

Router PEB

!
ip cef

!
interface Loopback0
ip address 1.1.1.3 255.255.255.255

!
interface Serial1/0
ip unnumbered Loopback0
mpls ip

!
router ospf 1
log-adjacency-changes
network 1.1.1.3 0.0.0.0 area 0
主要完成下列任务：
在全局模式打开赛虎CEF，CEF是运行MPLS所必须的；
配置相应的IP地址和完成IGP（OSPF）的配置；
在接口启用MPLS交换。

1.2在PE定义×××
主要完成下列任务：
定义vrf，定义不同的***路由选择和转发实例；
用RD（Router Distinguisher）标识×××，为用户×××创建路由选择和转发表；
从或者向***扩展公用体导入导出路由选择信息；
把VRF和接口或子接口关联起来。

Router PEA

!
ip vrf ***-a
rd 65001:1
route-target export 65001:1
route-target import 65001:1
!
ip vrf ***-b
rd 65001:2
route-target export 65001:2
route-target import 65001:2

interface Serial1/0
ip vrf forwarding ***-a
ip address 172.16.3.1 255.255.255.0

!
interface Serial1/2
ip vrf forwarding ***-b
ip address 172.16.5.1 255.255.255.252


Router PEB

!
ip vrf ***-a
rd 65001:1
route-target export 65001:1
route-target import 65001:1
!
ip vrf ***-b
rd 65001:2
route-target export 65001:2
route-target import 65001:2
!

interface Serial1/1
ip vrf forwarding ***-a
ip address 172.16.4.1 255.255.255.0
!
interface Serial1/2
ip vrf forwarding ***-b
ip address 172.16.5.5 255.255.255.252

!

1.3配置PE-PE的路由会话
配置PE-PE的路由主要完成下列任务：
启用BGP；
关闭ipv4单播前缀的通告；
配置PE的邻居PE；
激活IPv4到邻居的通告。
Router PEA
!
router bgp 4837
no bgp default ipv4-unicast
bgp log-neighbor-changes
neighbor 1.1.1.3 remote-as 4837
neighbor 1.1.1.3 update-source Loopback0
!
address-family ***v4
neighbor 1.1.1.3 activate
neighbor 1.1.1.3 send-community extended
exit-address-family
!
Router PEB
!
router bgp 4837
no synchronization
bgp log-neighbor-changes
neighbor 1.1.1.2 remote-as 4837
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 extended
exit-address-family
!

1.4配置BGP4的PE-CE的路由选择会话

Router PEA

!
router bgp 4837
no bgp default ipv4-unicast
bgp log-neighbor-changes
neighbor 1.1.1.3 remote-as 4837
neighbor 1.1.1.3 update-source Loopback0
!
address-family ***v4
neighbor 1.1.1.3 activate
neighbor 1.1.1.3 send-community extended
exit-address-family
!
address-family ipv4 vrf ***-b
neighbor 172.16.5.2 remote-as 65003
neighbor 172.16.5.2 activate
no synchronization
network 172.16.5.0 mask 255.255.255.252
exit-address-family
!
address-family ipv4 vrf ***-a
neighbor 172.16.3.2 remote-as 65001
neighbor 172.16.3.2 activate
no synchronization
network 172.16.3.0 mask 255.255.255.0
exit-address-family


Router PEB

router bgp 4837
no synchronization
bgp log-neighbor-changes
neighbor 1.1.1.2 remote-as 4837
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 extended
exit-address-family
!
address-family ipv4 vrf ***-b
neighbor 172.16.5.6 remote-as 65004
neighbor 172.16.5.6 activate
no synchronization
network 172.16.5.4 mask 255.255.255.252
exit-address-family
!
address-family ipv4 vrf ***-a
neighbor 172.16.4.2 remote-as 65002
neighbor 172.16.4.2 activate
no synchronization
network 172.16.4.0 mask 255.255.255.0
exit-address-family
!

2、配置CE路由器
Router CED

!
interface Loopback0
ip address 192.168.100.1 255.255.255.0
!
interface Serial1/0
ip address 172.16.5.6 255.255.255.252
!

router bgp 65004
bgp log-neighbor-changes
neighbor 172.16.5.5 remote-as 4837
!
address-family ipv4
neighbor 172.16.5.5 activate
no auto-summary
no synchronization
network 192.168.100.0
exit-address-family
!

Router CEC

!
interface Loopback0
ip address 192.168.10.1 255.255.255.0
!
interface Serial1/1
ip address 172.16.5.2 255.255.255.252

!
router bgp 65003
bgp log-neighbor-changes
neighbor 172.16.5.1 remote-as 4837
!
address-family ipv4
neighbor 172.16.5.1 activate
no auto-summary
no synchronization
network 192.168.10.0
exit-address-family
!

Router CEA
!
interface Loopback0
ip address 10.10.0.1 255.255.0.0
!
interface Serial1/1
ip address 172.16.3.2 255.255.255.0

!
router bgp 65001
no synchronization
bgp log-neighbor-changes
network 10.10.0.0 mask 255.255.0.0
neighbor 172.16.3.1 remote-as 4837
no auto-summary
!

Router CEB

!
interface Loopback0
ip address 10.20.0.1 255.255.0.0
!
interface Loopback1
ip address 10.40.0.1 255.255.0.0
!
interface Serial1/0
ip address 172.16.4.2 255.255.255.0
!
router bgp 65002
no synchronization
bgp log-neighbor-changes
network 10.20.0.0 mask 255.255.0.0
network 10.40.0.0 mask 255.255.0.0
neighbor 172.16.4.1 remote-as 4837
no auto-summary
!

结果验证：
CEA#   show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     172.16.0.0/24 is subnetted, 2 subnets
B       172.16.4.0 [20/0] via 172.16.3.1, 00:06:50
C       172.16.3.0 is directly connected, Serial1/1
     10.0.0.0/16 is subnetted, 3 subnets
C       10.10.0.0 is directly connected, Loopback0
B       10.20.0.0 [20/0] via 172.16.3.1, 00:06:50
B       10.40.0.0 [20/0] via 172.16.3.1, 00:06:50
CEA#

CEA#ping ip
Target IP address: 10.40.0.1
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]: 10
Extended commands [n]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.40.0.1, timeout is 10 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1400/2528/4192 ms
CEA#

CEC# show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-
       ia - IS-IS inter area, * - candidate default, U - per-user static ro
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

C    192.168.10.0/24 is directly connected, Loopback0
     172.16.0.0/30 is subnetted, 2 subnets
C       172.16.5.0 is directly connected, Serial1/1
B       172.16.5.4 [20/0] via 172.16.5.1, 00:09:20
B    192.168.100.0/24 [20/0] via 172.16.5.1, 00:09:20
CEC#

CEC#ping ip
Target IP address: 192.168.100.1
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]: 10
Extended commands [n]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.100.1, timeout is 10 seconds:
!!!!.
Success rate is 80 percent (4/5), round-trip min/avg/max = 1256/1972/3144 ms
CEC#

Comment:
终于在我的小本上实现了BGP/MPLS ×××，算是先僵化吧，当然还要继续固化，最后才有可能优化
职场 *** bgp 路由交换

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