在MPLS?×××網絡里的客戶，如果使用動態路由OSPF，就會被MPLS網割斷，形成的區不完整。

解決這個問題方法使用sham-link命令，可以使分割兩面的區一體化。

R3和R5是PE，R1是P，R7和R8是CE，R3和R8的F0/0之間建立area?0區，R5和R7的F1/0之間也建立area?0區，如果用一般重分發的方法，得到對端的OSPF路由是O?IA而不是O的，雖然雙方都是用的area?0，使用sham-link來完整0區。在R7和R8的lookback接口啟用area?1和2。

sham-link建立有些必要條件，要使用lookback接口作為起始和終端，要用/32地址

interface?Loopback2
?ip?vrf?forwarding?***-1
?ip?address?1.1.1.3?255.255.255.255

接口的IP路由要通過MP-BGP送達對端，

router?bgp?100

?address-family?ipv4?vrf?***-1

??redistribute?ospf?2?vrf?***-1

??network?1.1.1.3?mask?255.255.255.255

使用的OSPF進行號要相同，如沒有什么必要，不需要配置domain-id

router?ospf?2?vrf?***-1?

?area?0?sham-link?1.1.1.3?1.1.1.5

?redistribute?bgp?100?subnets
?network?10.10.1.0?0.0.0.255?area?0

?

R3#sh?ip?ro?vrf?***-1

Routing?Table:?***-1
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

?????1.0.0.0/32?is?subnetted,?2?subnets
C???????1.1.1.3?is?directly?connected,?Loopback2
B???????1.1.1.5?[200/0]?via?5.5.5.5,?00:36:34
?????10.0.0.0/24?is?subnetted,?4?subnets
C???????10.10.1.0?is?directly?connected,?FastEthernet1/0
O?IA????10.10.2.0?[110/2]?via?10.10.1.2,?00:06:30,?FastEthernet1/0
O???????10.10.3.0?[110/2]?via?5.5.5.5,?00:06:30
O?IA????10.10.4.0?[110/3]?via?5.5.5.5,?00:06:30

R3#sh?ip?b?v?v?***-1?10.10.1.0
BGP?routing?table?entry?for?123:1:10.10.1.0/24,?version?21
Paths:?(1?available,?best?#1,?table?***-1)
??Advertised?to?update-groups:
?????1
??Local
????0.0.0.0?from?0.0.0.0?(3.3.3.3)
??????Origin?incomplete,?metric?0,?localpref?100,?weight?32768,?valid,?sourced,?best
??????Extended?Community:?RT:123:1?OSPF?DOMAIN?ID:0x0005:0x000000020200
????????OSPF?RT:0.0.0.0:2:0?OSPF?ROUTER?ID:10.10.1.1:0
??????mpls?labels?in/out?22/aggregate(***-1)
R3#
R3#
R3#
R3#sh?ip?b?v?v?***-1?10.10.2.0
BGP?routing?table?entry?for?123:1:10.10.2.0/24,?version?43
Paths:?(1?available,?best?#1,?table?***-1)
Flag:?0x820
??Advertised?to?update-groups:
?????1
??Local
????10.10.1.2?from?0.0.0.0?(3.3.3.3)
??????Origin?incomplete,?metric?2,?localpref?100,?weight?32768,?valid,?sourced,?best
??????Extended?Community:?RT:123:1?OSPF?DOMAIN?ID:0x0005:0x000000020200
????????OSPF?RT:0.0.0.0:3:0?OSPF?ROUTER?ID:10.10.1.1:0
??????mpls?labels?in/out?25/nolabel
R3#
R3#
R3#sh?ip?b?v?v?***-1?10.10.3.0
BGP?routing?table?entry?for?123:1:10.10.3.0/24,?version?29
Paths:?(1?available,?best?#1,?table?***-1,?RIB-failure(17))
??Not?advertised?to?any?peer
??Local
????5.5.5.5?(metric?3)?from?1.1.1.1?(1.1.1.1)
??????Origin?incomplete,?metric?0,?localpref?100,?valid,?internal,?best
??????Extended?Community:?RT:123:1?OSPF?DOMAIN?ID:0x0005:0x000000020200
????????OSPF?RT:0.0.0.0:2:0?OSPF?ROUTER?ID:10.10.3.1:0
??????Originator:?5.5.5.5,?Cluster?list:?1.1.1.1
??????mpls?labels?in/out?nolabel/21
R3#
R3#
R3#sh?ip?b?v?v?***-1?10.10.4.0
BGP?routing?table?entry?for?123:1:10.10.4.0/24,?version?34
Paths:?(1?available,?best?#1,?table?***-1,?RIB-failure(17))
??Not?advertised?to?any?peer
??Local
????5.5.5.5?(metric?3)?from?1.1.1.1?(1.1.1.1)
??????Origin?incomplete,?metric?2,?localpref?100,?valid,?internal,?best
??????Extended?Community:?RT:123:1?OSPF?DOMAIN?ID:0x0005:0x000000020200
????????OSPF?RT:0.0.0.0:3:0?OSPF?ROUTER?ID:10.10.3.1:0
??????Originator:?5.5.5.5,?Cluster?list:?1.1.1.1
??????mpls?labels?in/out?nolabel/22
R3#

?

R8#sh?ip?ro
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

?????1.0.0.0/32?is?subnetted,?2?subnets
O?E2????1.1.1.3?[110/1]?via?10.10.1.1,?01:13:49,?FastEthernet0/0
O?E2????1.1.1.5?[110/1]?via?10.10.1.1,?01:13:49,?FastEthernet0/0
?????10.0.0.0/24?is?subnetted,?4?subnets
C???????10.10.1.0?is?directly?connected,?FastEthernet0/0
C???????10.10.2.0?is?directly?connected,?Loopback0
O???????10.10.3.0?[110/3]?via?10.10.1.1,?01:13:49,?FastEthernet0/0
O?IA????10.10.4.0?[110/4]?via?10.10.1.1,?01:13:49,?FastEthernet0/0
R8#sh?ip?os?da

????????????OSPF?Router?with?ID?(10.10.5.1)?(Process?ID?2)

????????????????Router?Link?States?(Area?0)

Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum?Link?count
10.10.1.1???????10.10.1.1???????1385????????0x8000002B?0x006C0D?2
10.10.3.1???????10.10.3.1???????2?????(DNA)?0x80000007?0x00DABC?2
10.10.3.2???????10.10.3.2???????3?????(DNA)?0x8000000A?0x00C6FE?1
10.10.5.1???????10.10.5.1???????549?????????0x80000009?0x008840?1

????????????????Net?Link?States?(Area?0)

Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum
10.10.1.1???????10.10.1.1???????1385????????0x80000003?0x00B328
10.10.3.1???????10.10.3.1???????1125??(DNA)?0x80000004?0x009342

????????????????Summary?Net?Link?States?(Area?0)

Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum
10.10.2.0???????10.10.5.1???????549?????????0x80000003?0x00AA5F
10.10.4.0???????10.10.3.2???????3?????(DNA)?0x80000001?0x00A06A

????????????????Router?Link?States?(Area?1)

Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum?Link?count
10.10.5.1???????10.10.5.1???????549?????????0x80000003?0x009252?1

????????????????Summary?Net?Link?States?(Area?1)

Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum
10.10.1.0???????10.10.5.1???????552?????????0x80000003?0x00B555
10.10.3.0???????10.10.5.1???????552?????????0x80000003?0x00B353
10.10.4.0???????10.10.5.1???????552?????????0x80000003?0x00B252

????????????????Summary?ASB?Link?States?(Area?1)

Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum
10.10.1.1???????10.10.5.1???????552?????????0x80000003?0x009D6B
10.10.3.1???????10.10.5.1???????552?????????0x80000003?0x009174

????????????????Type-5?AS?External?Link?States

Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum?Tag
1.1.1.3?????????10.10.1.1???????361?????????0x80000004?0x0074EA?3489661028
1.1.1.3?????????10.10.3.1???????42????(DNA)?0x80000001?0x006CF3?3489661028
1.1.1.5?????????10.10.1.1???????361?????????0x80000004?0x0060FC?3489661028
1.1.1.5?????????10.10.3.1???????16????(DNA)?0x80000001?0x005806?3489661028
R8#ping?10.10.4.1

Type?escape?sequence?to?abort.
Sending?5,?100-byte?ICMP?Echos?to?10.10.4.1,?timeout?is?2?seconds:
!!!!!
Success?rate?is?100?percent?(5/5),?round-trip?min/avg/max?=?112/128/160?ms
R8#

下面貼一下完整配置。

R8

hostname?R8
!
boot-start-marker
boot-end-marker
!
!
no?aaa?new-model
memory-size?iomem?5
!
!
ip?cef
no?ip?domain?lookup
ip?domain?name?lab.local
!
!
interface?Loopback0
?ip?address?10.10.2.1?255.255.255.0
?ip?ospf?network?point-to-point
!
interface?FastEthernet0/0
?ip?address?10.10.1.2?255.255.255.0
?duplex?auto
?speed?auto
!
interface?FastEthernet1/0
?no?ip?address
?shutdown
?duplex?auto
?speed?auto
!
router?ospf?2
?log-adjacency-changes
?network?10.10.1.0?0.0.0.255?area?0
?network?10.10.2.0?0.0.0.255?area?1
!
no?ip?http?server

?

R3

hostname?R3
!
boot-start-marker
boot-end-marker
!
!
no?aaa?new-model
memory-size?iomem?5
!
!
ip?cef
no?ip?domain?lookup
ip?domain?name?lab.local
!
!
ip?vrf?***-1
?rd?123:1
?route-target?export?123:1
?route-target?import?123:1
!
!
interface?Loopback1
?ip?address?3.3.3.3?255.255.255.255
!
interface?Loopback2
?ip?vrf?forwarding?***-1
?ip?address?1.1.1.3?255.255.255.255
!
interface?FastEthernet0/0
?ip?address?192.168.5.1?255.255.255.0
?duplex?auto
?speed?auto
?mpls?ip
!
interface?FastEthernet1/0
?ip?vrf?forwarding?***-1
?ip?address?10.10.1.1?255.255.255.0
?duplex?auto
?speed?auto
!
interface?FastEthernet2/0
?ip?address?192.168.1.1?255.255.255.0
?duplex?auto
?speed?auto
?mpls?ip
!
router?ospf?2?vrf?***-1
?log-adjacency-changes
?area?0?sham-link?1.1.1.3?1.1.1.5
?redistribute?bgp?100?subnets
?network?10.10.1.0?0.0.0.255?area?0
!
router?ospf?1
?log-adjacency-changes
?network?3.3.3.3?0.0.0.0?area?0
?network?192.168.1.0?0.0.0.255?area?0
?network?192.168.5.0?0.0.0.255?area?0
!
router?bgp?100
?no?synchronization
?bgp?log-neighbor-changes
?network?1.1.1.3?mask?255.255.255.255
?neighbor?1.1.1.1?remote-as?100
?neighbor?1.1.1.1?update-source?Loopback1
?neighbor?2.2.2.2?remote-as?100
?neighbor?2.2.2.2?update-source?Loopback1
?no?auto-summary
?!
?address-family?***v4
??neighbor?1.1.1.1?activate
??neighbor?1.1.1.1?send-community?both
??neighbor?2.2.2.2?activate
??neighbor?2.2.2.2?send-community?both
?exit-address-family
?!
?address-family?ipv4?vrf?***-1
??redistribute?ospf?2?vrf?***-1
??no?synchronization
??network?1.1.1.3?mask?255.255.255.255
?exit-address-family
!
no?ip?http?server

?

R1

hostname?R1
!
boot-start-marker
boot-end-marker
!
!
no?aaa?new-model
memory-size?iomem?5
!
!
ip?cef
no?ip?domain?lookup
ip?domain?name?lab.local
!
!
interface?Loopback1
?ip?address?1.1.1.1?255.255.255.255
!
interface?FastEthernet0/0
?ip?address?192.168.6.1?255.255.255.0
?duplex?auto
?speed?auto
?mpls?ip
!
interface?FastEthernet1/0
?ip?address?192.168.1.2?255.255.255.0
?duplex?auto
?speed?auto
?mpls?ip
!
interface?FastEthernet2/0
?ip?address?192.168.3.1?255.255.255.0
?duplex?auto
?speed?auto
?mpls?ip
!
router?ospf?1
?log-adjacency-changes
?network?1.1.1.1?0.0.0.0?area?0
?network?192.168.1.0?0.0.0.255?area?0
?network?192.168.3.0?0.0.0.255?area?0
?network?192.168.6.0?0.0.0.255?area?0
!
router?bgp?100
?no?synchronization
?bgp?log-neighbor-changes
?neighbor?aaa?peer-group
?neighbor?aaa?remote-as?100
?neighbor?aaa?update-source?Loopback1
?neighbor?2.2.2.2?peer-group?aaa
?neighbor?3.3.3.3?peer-group?aaa
?neighbor?4.4.4.4?peer-group?aaa
?neighbor?5.5.5.5?peer-group?aaa
?neighbor?6.6.6.6?peer-group?aaa
?no?auto-summary
?!
?address-family?***v4
??neighbor?aaa?send-community?both
??neighbor?aaa?route-reflector-client
??neighbor?2.2.2.2?activate
??neighbor?3.3.3.3?activate
??neighbor?4.4.4.4?activate
??neighbor?5.5.5.5?activate
??neighbor?6.6.6.6?activate
?exit-address-family
!
no?ip?http?server

?

?

R5

hostname?R5
!
boot-start-marker
boot-end-marker
!
!
no?aaa?new-model
memory-size?iomem?5
!
!
ip?cef
no?ip?domain?lookup
ip?domain?name?lab.local
!
!
ip?vrf?***-1
?rd?123:1
?route-target?export?123:1
?route-target?import?123:1
!
!
interface?Loopback1
?ip?address?5.5.5.5?255.255.255.255
!
interface?Loopback2
?ip?vrf?forwarding?***-1
?ip?address?1.1.1.5?255.255.255.255
!
interface?FastEthernet0/0
?no?ip?address
?shutdown
?duplex?auto
?speed?auto
!
interface?FastEthernet1/0
?ip?address?192.168.3.2?255.255.255.0
?duplex?auto
?speed?auto
?mpls?ip
!
interface?FastEthernet2/0
?ip?vrf?forwarding?***-1
?ip?address?10.10.3.1?255.255.255.0
?duplex?auto
?speed?auto
!
router?ospf?2?vrf?***-1
?log-adjacency-changes
?area?0?sham-link?1.1.1.5?1.1.1.3
?redistribute?bgp?100?subnets
?network?10.10.3.0?0.0.0.255?area?0
!
router?ospf?1
?log-adjacency-changes
?network?5.5.5.5?0.0.0.0?area?0
?network?192.168.3.0?0.0.0.255?area?0
?network?192.168.7.0?0.0.0.255?area?0
!
router?bgp?100
?no?synchronization
?bgp?log-neighbor-changes
?neighbor?1.1.1.1?remote-as?100
?neighbor?1.1.1.1?update-source?Loopback1
?neighbor?2.2.2.2?remote-as?100
?neighbor?2.2.2.2?update-source?Loopback1
?no?auto-summary
?!
?address-family?***v4
??neighbor?1.1.1.1?activate
??neighbor?1.1.1.1?send-community?both
??neighbor?2.2.2.2?activate
??neighbor?2.2.2.2?send-community?both
?exit-address-family
?!
?address-family?ipv4?vrf?***-1
??redistribute?ospf?2?vrf?***-1
??no?synchronization
??network?1.1.1.5?mask?255.255.255.255
?exit-address-family
!
no?ip?http?server

?

?

R7

hostname?R7
!
boot-start-marker
boot-end-marker
!
!
no?aaa?new-model
memory-size?iomem?5
!
!
ip?cef
no?ip?domain?lookup
ip?domain?name?lab.local
!
!
interface?Loopback0
?ip?address?10.10.4.1?255.255.255.0
?ip?ospf?network?point-to-point
!
interface?FastEthernet0/0
?no?ip?address
?duplex?auto
?speed?auto
!
interface?FastEthernet1/0
?ip?address?10.10.3.2?255.255.255.0
?duplex?auto
?speed?auto
!
router?ospf?2
?log-adjacency-changes
?network?10.10.3.0?0.0.0.255?area?0
?network?10.10.4.0?0.0.0.255?area?2
!
no?ip?http?server

轉載于:https://blog.51cto.com/xushen/1262155

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