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MPLS ×××实验之OSPF sham-link

發(fā)布時(shí)間：2024/1/17 编程问答 26 豆豆

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配置Sham-Link 時(shí)，需要滿足以下條件：

＊在PE 上單獨(dú)創(chuàng)建/3 2 位的地址，在PE 之間使用這個(gè)地址來建立 Sham-Link 。

＊這個(gè)／32位地址的接口必須放入相應(yīng)的VRF。

＊這個(gè)／32位地址必須在B GP 里發(fā)布，而不能在OSPF里發(fā)布。

注：Sham-Link 是有COST值的，PE 穿越MPLS ×××骨干網(wǎng)絡(luò)的OSPF CO ST值，就是Sham-Link 的CO ST值，如果沒有后門鏈路，Sham-Link 就不需要?jiǎng)?chuàng)建了。

說明: 在上圖中，CE 路由器R3和R4上分別有地址33.3.3.3和44.4.4.4，配置 Sham-Link使PE 路由器到達(dá)遠(yuǎn)程場(chǎng)點(diǎn)地址從MPLS ×××骨干網(wǎng)絡(luò)中傳輸。

1．配置R1與R2的路由協(xié)議為RIP-sh run 配置

R1#sh run | s r r

router rip

version 2

network 1.0.0.0

network 10.0.0.0

no auto-summary

R2#sh run | s r r ?

router rip

version 2

network 2.0.0.0

network 10.0.0.0

no auto-summary

2．在R1與R2上配置MPLS

ip cef

mpls label range 100 199

mpls label protocol ldp

mpls ldp router-id lo0 force

interface Ethernet1/0

ip address 10.1.12.1 255.255.255.0

mpls ip

ip cef

mpls label range 200 299

mpls label protocol ldp

mpls ldp router-id lo0 force

interface Ethernet1/1

ip address 10.1.12.2 255.255.255.0

mpls ip

3.配置MPLS ×××

R1#sh run | s ip vrf

ip vrf ***1

rd 1:100

route-target export 1:100

route-target import 1:100

R1(config)#int e1/1

R1(config -i f)#ip vrf forwarding ***1

R2#sh run ?| s ip vrf

ip vrf ***1

rd 1:100

route-target export 1:100

route-target import 1:100

R2(config)#int e1/0

R2(config -i f)#ip vrf forwarding ***1

4．配置OSPF

R1#sh run | s r o

router ospf 1 vrf ***1

router-id 1.1.1.1

network 1.1.1.0 0.0.0.255 area 1

network 10.1.13.0 0.0.0.255 area 1

R2#sh run | s r o

router ospf 1 vrf ***1

router-id 2.2.2.2

network 2.2.2.0 0.0.0.255 area 1

network 10.1.24.0 0.0.0.255 area 1

R3#sh run | s r o

router ospf 1

router-id 3.3.3.3

network 3.3.3.0 0.0.0.255 area 1

network 10.1.13.0 0.0.0.255 area 1

network 10.1.34.0 0.0.0.255 area 1

network 33.3.3.3 0.0.0.0 area 1

R4#sh run | s r o

router ospf 1

router-id 4.4.4.4

network 4.4.4.0 0.0.0.255 area 1

network 10.1.24.0 0.0.0.255 area 1

network 10.1.34.0 0.0.0.255 area 1

network 44.4.4.4 0.0.0.0 area 1

5.配置MP-BGP

R1#sh run ?| s r b

router bgp 12

bgp router-id 1.1.1.1

bgp log-neighbor-changes

neighbor 2.2.2.2 remote-as 12

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

address-family ipv4 vrf ***1

?network 100.1.1.1 mask 255.255.255.255

?redistribute ospf 1

exit-address-family

R2#sh run | s r b

router bgp 12

bgp router-id 2.2.2.2

bgp log-neighbor-changes

neighbor 1.1.1.1 remote-as 12

neighbor 1.1.1.1 update-source Loopback0

address-family ***v4

?neighbor 1.1.1.1 activate

?neighbor 1.1.1.1 send-community extended

exit-address-family

address-family ipv4 vrf ***1

?network 200.1.1.1 mask 255.255.255.255

?redistribute ospf 1

exit-address-family

6.查看路由

(1)查看PE路由器R1 bgp的路由

R1#sh ip bgp ***v4 all

BGP table version is 8, local router ID is 1.1.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

? ? ? ? ? ? ?r RIB-failure, S Stale, m multipath, b backup-path, x best-external, f RT-Filter, a additional-path

Origin codes: i - IGP, e - EGP, ? - incomplete

? Network ? ? ? ? ?Next Hop ? ? ? ? ? ?Metric LocPrf Weight Path

Route Distinguisher: 1:100 (default for vrf ***1)

* i3.3.3.3/32 ? ? ? 2.2.2.2 ? ? ? ? ? ? ? ? 21 ? ?100 ? ? ?0 ?

*> ? ? ? ? ? ? ? ? ?10.1.13.3 ? ? ? ? ? ? ? 11 ? ? ? ? 32768 ?

* i4.4.4.4/32 ? ? ? 2.2.2.2 ? ? ? ? ? ? ? ? 11 ? ?100 ? ? ?0 ?

*> ? ? ? ? ? ? ? ? ?10.1.13.3 ? ? ? ? ? ? ? 21 ? ? ? ? 32768 ?

* i10.1.13.0/24 ? ? 2.2.2.2 ? ? ? ? ? ? ? ? 30 ? ?100 ? ? ?0 ?

*> ? ? ? ? ? ? ? ? ?0.0.0.0 ? ? ? ? ? ? ? ? ?0 ? ? ? ? 32768 ?

* i10.1.24.0/24 ? ? 2.2.2.2 ? ? ? ? ? ? ? ? ?0 ? ?100 ? ? ?0 ?

*> ? ? ? ? ? ? ? ? ?10.1.13.3 ? ? ? ? ? ? ? 30 ? ? ? ? 32768 ?

* i10.1.34.0/24 ? ? 2.2.2.2 ? ? ? ? ? ? ? ? 20 ? ?100 ? ? ?0 ?

*> ? ? ? ? ? ? ? ? ?10.1.13.3 ? ? ? ? ? ? ? 20 ? ? ? ? 32768 ?

* i33.3.3.3/32 ? ? ?2.2.2.2 ? ? ? ? ? ? ? ? 21 ? ?100 ? ? ?0 ?

*> ? ? ? ? ? ? ? ? ?10.1.13.3 ? ? ? ? ? ? ? 11 ? ? ? ? 32768 ?

* i44.4.4.4/32 ? ? ?2.2.2.2 ? ? ? ? ? ? ? ? 11 ? ?100 ? ? ?0 ?

*> ? ? ? ? ? ? ? ? ?10.1.13.3 ? ? ? ? ? ? ? 21 ? ? ? ? 32768 ?

說明: PE路由器 R1到達(dá) 33.3.3.3和44.4.4.4都從 CE路由器 R3走。

(２)查看PE路由器R1 vrf的路由

R1#sh ip route vrf ***1

Routing Table: ***1

Codes: L - local, 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, H - NHRP, l - LISP

? ? ? + - replicated route, % - next hop override

Gateway of last resort is not set

? ? ?3.0.0.0/32 is subnetted, 1 subnets

O ? ? ? ?3.3.3.3 [110/11] via 10.1.13.3, 00:15:24, Ethernet1/1

? ? ?4.0.0.0/32 is subnetted, 1 subnets

O ? ? ? ?4.4.4.4 [110/21] via 10.1.13.3, 00:07:17, Ethernet1/1

? ? ?10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks

C ? ? ? ?10.1.13.0/24 is directly connected, Ethernet1/1

L ? ? ? ?10.1.13.1/32 is directly connected, Ethernet1/1

O ? ? ? ?10.1.24.0/24 [110/30] via 10.1.13.3, 00:07:17, Ethernet1/1

O ? ? ? ?10.1.34.0/24 [110/20] via 10.1.13.3, 00:07:17, Ethernet1/1

? ? ?33.0.0.0/32 is subnetted, 1 subnets

O ? ? ? ?33.3.3.3 [110/11] via 10.1.13.3, 00:08:04, Ethernet1/1

? ? ?44.0.0.0/32 is subnetted, 1 subnets

O ? ? ? ?44.4.4.4 [110/21] via 10.1.13.3, 00:07:17, Ethernet1/1

說明: PE路由器 R1到達(dá) 33.3.3.3和44.4.4.4都從 CE路由器 R3走。

7.在PE路由器之間創(chuàng)建Sham-Link

(1)在PE路由器上創(chuàng)建/32 位loopback地址

R1#sh run int l100

interface Loopback100

ip vrf forwarding ***1 -------在配置完此命令后，地址會(huì)消失，需要重新配置IP。

ip address 100.1.1.1 255.255.255.255

end

說明: 創(chuàng)建的/32 位地址必須放入 VRF。

R2#sh run int l100

interface Loopback100

ip vrf forwarding ***1

ip address 200.1.1.1 255.255.255.255

說明: 創(chuàng)建的/32 位地址必須放入 VRF。

(2)將/32 位地址在MP-BGP 里發(fā)布

R1(config)#router bg 12

R1(config-router)#address-family ipv4 vrf ***1

R1(config-router-af)#network 100.1.1.1 mask 255.255.255.255 ?

R2(config)#router bg 12

R2(config-router)#address-family ipv4 vrf ***1

R2(config-router-af)#network 200.1.1.1 mask 255.255.255.255

(3) 創(chuàng)建Sham-Link

R1(config)#router ospf 2 vrf ***1

r1(config-router)#area 1 sham-link 100.1.1.1 ?200.1.1.1 cost 10

說明: 創(chuàng)建Sham-Link 時(shí)，要指定源地址和目的地址，并且指明COST 值。

R2:

R2(config)#router ospf 1 vrf ***1

R2(config-router)#area 1 sham-link 200.1.1.1 100.1.1.1 cost 10

說明: 創(chuàng)建Sham-Link 時(shí)，要指定源地址和目的地址，并且指明COST 值。 ?

8．查看結(jié)果

(1)在PE路由器R1,R2上查看 Sham-Link

R1#sh ip os sham-links

Sham Link OSPF_SL0 to address 200.1.1.1 is up

Area 1 source address 100.1.1.1

?Run as demand circuit

?DoNotAge LSA allowed. Cost of using 10 State POINT_TO_POINT,

?Timer intervals configured, Hello 10, Dead 40, Wait 40,

? ?Hello due in 00:00:00

? ?Adjacency State FULL (Hello suppressed)

? ?Index 2/2, retransmission queue length 0, number of retransmission 0

? ?First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)

? ?Last retransmission scan length is 0, maximum is 0

? ?Last retransmission scan time is 0 msec, maximum is 0 msec

R2#sh ip os sham-links

Sham Link OSPF_SL0 to address 100.1.1.1 is up

Area 1 source address 200.1.1.1

?Run as demand circuit

?DoNotAge LSA allowed. Cost of using 10 State POINT_TO_POINT,

?Timer intervals configured, Hello 10, Dead 40, Wait 40,

? ?Hello due in 00:00:08

? ?Adjacency State FULL (Hello suppressed)

? ?Index 2/2, retransmission queue length 0, number of retransmission 0

? ?First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)

? ?Last retransmission scan length is 0, maximum is 0

? ?Last retransmission scan time is 0 msec, maximum is 0 msec

?說明: Sham-Link建立成功。

(2)在PE路由器R1上查看 MP-BGP 的路由

R1#sh ip bgp ***v4 all

BGP table version is 14, local router ID is 1.1.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

? ? ? ? ? ? ?r RIB-failure, S Stale, m multipath, b backup-path, x best-external, f RT-Filter, a additional-path

Origin codes: i - IGP, e - EGP, ? - incomplete

? Network ? ? ? ? ?Next Hop ? ? ? ? ? ?Metric LocPrf Weight Path

Route Distinguisher: 1:100 (default for vrf ***1)

*> 3.3.3.3/32 ? ? ? 10.1.13.3 ? ? ? ? ? ? ? 11 ? ? ? ? 32768 ?

r>i4.4.4.4/32 ? ? ? 2.2.2.2 ? ? ? ? ? ? ? ? 11 ? ?100 ? ? ?0 ?

*> 10.1.13.0/24 ? ? 0.0.0.0 ? ? ? ? ? ? ? ? ?0 ? ? ? ? 32768 ?

r>i10.1.24.0/24 ? ? 2.2.2.2 ? ? ? ? ? ? ? ? ?0 ? ?100 ? ? ?0 ?

* i10.1.34.0/24 ? ? 2.2.2.2 ? ? ? ? ? ? ? ? 20 ? ?100 ? ? ?0 ?

*> ? ? ? ? ? ? ? ? ?10.1.13.3 ? ? ? ? ? ? ? 20 ? ? ? ? 32768 ?

*> 33.3.3.3/32 ? ? ?10.1.13.3 ? ? ? ? ? ? ? 11 ? ? ? ? 32768 ?

r>i44.4.4.4/32 ? ? ?2.2.2.2 ? ? ? ? ? ? ? ? 11 ? ?100 ? ? ?0 ?

*> 100.1.1.1/32 ? ? 0.0.0.0 ? ? ? ? ? ? ? ? ?0 ? ? ? ? 32768 i

*>i200.1.1.1/32 ? ? 2.2.2.2 ? ? ? ? ? ? ? ? ?0 ? ?100 ? ? ?0 i

說明: 到達(dá)遠(yuǎn)程場(chǎng)點(diǎn)44.4.4.4 的路徑選擇從MPLS ××× 骨干網(wǎng)絡(luò)中走。

(3)在PE路由器R1上查看 VRF 的路由

R1#sh ip route vrf ***1

Routing Table: ***1

Codes: L - local, 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, H - NHRP, l - LISP

? ? ? + - replicated route, % - next hop override

Gateway of last resort is not set

? ? ?3.0.0.0/32 is subnetted, 1 subnets

O ? ? ? ?3.3.3.3 [110/11] via 10.1.13.3, 01:15:29, Ethernet1/1

? ? ?4.0.0.0/32 is subnetted, 1 subnets

O ? ? ? ?4.4.4.4 [110/21] via 10.1.13.3, 01:07:22, Ethernet1/1

? ? ? ? ? ? ? ? [110/21] via 200.1.1.1, 00:51:32

? ? ? ? ? ? ? ? [110/21] via 2.2.2.2, 00:51:32

? ? ?10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks

C ? ? ? ?10.1.13.0/24 is directly connected, Ethernet1/1

L ? ? ? ?10.1.13.1/32 is directly connected, Ethernet1/1

O ? ? ? ?10.1.24.0/24 [110/20] via 2.2.2.2, 00:51:32

O ? ? ? ?10.1.34.0/24 [110/20] via 10.1.13.3, 01:07:22, Ethernet1/1

? ? ?33.0.0.0/32 is subnetted, 1 subnets

O ? ? ? ?33.3.3.3 [110/11] via 10.1.13.3, 01:08:09, Ethernet1/1

? ? ?44.0.0.0/32 is subnetted, 1 subnets

O ? ? ? ?44.4.4.4 [110/21] via 2.2.2.2, 00:51:32

? ? ?100.0.0.0/32 is subnetted, 1 subnets

C ? ? ? ?100.1.1.1 is directly connected, Loopback100

? ? ?200.1.1.0/32 is subnetted, 1 subnets

B ? ? ? ?200.1.1.1 [200/0] via 2.2.2.2, 00:54:01

說明: 到達(dá)遠(yuǎn)程場(chǎng)點(diǎn)44.4.4.4 的路徑選擇從MPLS ××× 骨干網(wǎng)絡(luò)中走。

注：因?yàn)閟ham-link 是要COST 值的，相當(dāng)于物理接口，要調(diào)整CE 的選路，請(qǐng)調(diào)整

sham-link和各接口COST值來完成。

轉(zhuǎn)載于:https://blog.51cto.com/ihiptf/1239255

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