MPLS---OSPF试验-创新互联

Ip 地址如上图，Loopback 0 分别为 x.x.x.x/32 R1/R5是CE。R2/R3/R4是ISP：R2/R4是PE，R3是P。

步骤一、ISP内部 运行IGP（ISIS）协议

R2：

router isis

 net 24.0234.0000.0000.0002.00

interface Serial1/1

ip router isis

interface Loopback0

ip router isis

R3：

router isis

 net 24.0234.0000.0000.0003.00

interface Serial1/1

ip router isis

nterface Serial1/0

ip router isis

interface Loopback0

ip router isis

R4：

router isis

 net 24.0234.0000.0000.0004.00

interface Serial1/0

ip router isis

interface Loopback0

ip router isis

配置完检查邻居关系的建立：

R3# sh clns neighbors

System Id     Interface  SNPA               State Holdtime Type Protocol

R4            Se1/1      *HDLC*             Up    29       L1L2 IS-IS

R2            Se1/0      *HDLC*             Up    27       L1L2 IS-IS

R2/R4上show ip route 查看路由是否学到

R2#sh ip route

    34.0.0.0/24 is subnetted, 1 subnets

i L1   34.0.0.0 [115/20] via 23.0.0.3, Serial1/1

    2.0.0.0/32 is subnetted, 1 subnets

C      2.2.2.2 is directly connected, Loopback0

    3.0.0.0/32 is subnetted, 1 subnets

i L1   3.3.3.3 [115/20] via 23.0.0.3, Serial1/1

    4.0.0.0/32 is subnetted, 1 subnets

i L1   4.4.4.4 [115/30] via 23.0.0.3, Serial1/1

    23.0.0.0/24 is subnetted, 1 subnets

C      23.0.0.0 is directly connected, Serial1/1

步骤二、ISP内部实现MPLS

R2：

mpls label range 200 300

mpls ldp route-id   lo 0

int s 1/1

mpls ip

R3:

mpls label range 300 400

mpls ldp route-id   lo 0

int s 1/1

mpls ip

int s 1/0

mpls ip

R4:

mpls label range 400 500

mpls ldp route-id   lo 0

int s 1/0

mpls ip

然后在R3上查看LDP 邻居的建立：

R3#sh mpls ldp neighbor

   Peer LDP Ident: 2.2.2.2:0; Local LDP Ident 3.3.3.3:0

       TCP connection: 2.2.2.2.646 - 3.3.3.3.33300

       State: Oper; Msgs sent/rcvd: 34/37; Downstream

       Up time: 00:23:03

       LDP discovery sources:

         Serial1/0, Src IP addr: 23.0.0.2

       Addresses bound to peer LDP Ident:

         23.0.0.2       2.2.2.2

   Peer LDP Ident: 4.4.4.4:0; Local LDP Ident 3.3.3.3:0

       TCP connection: 4.4.4.4.32962 - 3.3.3.3.646

       State: Oper; Msgs sent/rcvd: 25/28; Downstream

       Up time: 00:14:27

       LDP discovery sources:

         Serial1/1, Src IP addr: 34.0.0.4

       Addresses bound to peer LDP Ident:

         34.0.0.4       4.4.4.4

LDP邻居建立完成即可。

步骤三、ISP 中R2与R4（PE之间）建立MBPG-×××关系

R2：

router bgp 1

no au                                                         默认关闭的

no syn                                                        默认关闭的

 no bgp default ipv4-unicast

 bgp log-neighbor-changes

 neighbor 4.4.4.4 remote-as 1

 neighbor 4.4.4.4 update-source Loopback0

 !

 address-family ***v4

 neighbor 4.4.4.4 activate

 neighbor 4.4.4.4 send-community extended

 exit-address-family

R4：

router bgp 1

 no au

 no syn

 no bgp default ipv4-unicast

 bgp log-neighbor-changes

 neighbor 2.2.2.2 remote-as 1

 neighbor 2.2.2.2 update-source Loopback0

 !

 address-family ***v4

 neighbor 2.2.2.2 activate

 neighbor 2.2.2.2 send-community extended

 exit-address-family

检查邻居是否建立成功：

R4#  sh ip bg *** all summary

Neighbor       V   AS MsgRcvd MsgSent  TblVer InQ OutQ Up/Down State/PfxRcd

2.2.2.2        4    1     35     33       9   0   0 00:25:47       2

R2# sh ip bg *** all su

Neighbor       V   AS MsgRcvd MsgSent  TblVer InQ OutQ Up/Down State/PfxRcd

4.4.4.4        4    1     34     36       9   0   0 00:26:14       2

步骤四、VRF的导入导出

R2/R4

创建VRF

ip vrf OSPF

 rd 1:100

 route-target export 1:100

 route-target import 1:100

接口下启用VRF

R2 interface Serial1/0

 I   p vrf forwarding OSPF

R4 interface Serial1/1

 ip vrf forwarding OSPF

PE-CE间使用ospf路由协议

R1：

router ospf 1

 router-id 1.1.1.1

 log-adjacency-changes

 network 1.1.1.1 0.0.0.0 area 0

 network 12.0.0.1 0.0.0.0 area 0

R2：

router ospf 1 vrf OSPF

 log-adjacency-changes

network 12.0.0.2 0.0.0.0 area 0

R5：

router ospf 1

 router-id 5.5.5.5

 log-adjacency-changes

 network 5.5.5.5 0.0.0.0 area 0

 network 45.0.0.5 0.0.0.0 area 0

R4

router ospf 1 vrf OSPF

 log-adjacency-changes

network 45.0.0.4 0.0.0.0 area 0

R2/R4 VRF 和BGP路由相互重分布

R2/R4

router ospf 1 vrf OSPF

 redistribute bgp 1 subnets

router bgp 1

address-family ipv4 vrf OSPF

  redistribute ospf 1 vrf OSPF match internal external 1 external 2

 no synchronization

 exit-address-family

R2/R4 上检查VRF路由是否学到

R2#sh ip bg *** all

  Network         Next Hop           Metric LocPrf Weight Path

Route Distinguisher: 1:1 (default for vrf RIP)

*> 1.1.1.1/32      12.0.0.1                1        32768 ?

*>i5.5.5.5/32      4.4.4.4                 1   100     0 ?

*> 12.0.0.0/24     0.0.0.0                 0        32768 ?

*>i45.0.0.0/24     4.4.4.4                 0   100     0 ?

查看R1/R5路由是否学到：

R1#       sh ip route

    1.0.0.0/32 is subnetted, 1 subnets

C      1.1.1.1 is directly connected, Loopback0

    5.0.0.0/32 is subnetted, 1 subnets

O IA   5.5.5.5 [110/129] via 12.0.0.2, 00:11:14, Serial1/1

    12.0.0.0/24 is subnetted, 1 subnets

C      12.0.0.0 is directly connected, Serial1/1

    45.0.0.0/24 is subnetted, 1 subnets

O IA   45.0.0.0 [110/65] via 12.0.0.2, 00:11:14, Serial1/1

 步骤五、测试MPLS ，查看转发过程标签转换情况

单方向从R1-R5观察：

R1#traceroute 5.5.5.5

Type escape sequence to abort.

Tracing the route to 5.5.5.5

 1 12.0.0.2 48 msec 48 msec 32 msec

 2 23.0.0.3 [MPLS: Labels 301/403 Exp 0] 112 msec 120 msec 160 msec

 3 45.0.0.4 [MPLS: Label 403 Exp 0] 108 msec 120 msec 108 msec

 4 45.0.0.5 128 msec * 104 msec

R2#sh ip cef vrf OSPF detail

5.5.5.5/32, version 9, epoch 0, cached adjacency to Serial1/1

0 packets, 0 bytes

 tag information set

   local tag: ×××-route-head

   fast tag rewrite with Se1/1, point2point, tags imposed: {301 403}

 via 4.4.4.4, 0 dependencies, recursive

   next hop 23.0.0.3, Serial1/1 via 4.4.4.4/32

   valid cached adjacency

tag rewrite with Se1/1, point2point, tags imposed: {301 403}

R3#sh mpls forwarding-table

Local Outgoing   Prefix           Bytes tag Outgoing  Next Hop

tag   tag or VC  or Tunnel Id     switched  interface

301   Pop tag    4.4.4.4/32       4760      Se1/1     point2point

R4#sh ip cef vrf OSPF detail

5.5.5.5/32, version 10, epoch 0, cached adjacency to Serial1/1

0 packets, 0 bytes

 tag information set

   local tag: 403

 via 45.0.0.5, Serial1/1, 0 dependencies

   next hop 45.0.0.5, Serial1/1

   valid cached adjacency

   tag rewrite with Se1/1, point2point, tags imposed: {}

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