使用Subnet關鍵字將連線的網路重新分發到OSPF

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已更新: 2011 年 11 月 29 日

文件 ID:113339

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關於此翻譯

思科已使用電腦和人工技術翻譯本文件，讓全世界的使用者能夠以自己的語言理解支援內容。請注意，即使是最佳機器翻譯，也不如專業譯者翻譯的內容準確。Cisco Systems, Inc. 對這些翻譯的準確度概不負責，並建議一律查看原始英文文件（提供連結）。

簡介

本檔案將說明將連線路由重新分發到開放最短路徑優先(OSPF)的行為。有兩種行為取決於重分佈連線的網路時是否給定subnet關鍵字。通常，當使用redistribute命令將路由重分發到OSPF域時，路由器會自動成為自治系統邊界路由器(ASBR)。預設情況下，當使用connected關鍵字將來自協定的路由重分發到OSPF時，這些路由將作為AS外部重分發，並且僅重分發未劃分子網的路由。如果包括subnets關鍵字，OSPF將重新分發已劃分子網的路由。該過程使用20作為預設度量。當使用metric-type關鍵字未指定度量時，會發生這種情況。

必要條件

需求

嘗試此組態之前，請確保符合以下要求：

通用IP路由知識
瞭解OSPF路由協定概念和術語

註：使用Command Lookup Tool(僅限註冊客戶)查詢有關本文檔中使用的命令的更多資訊。

網路圖表

本檔案會使用以下網路設定：

組態

本檔案會使用以下設定：

路由器R1
路由器R2
路由器R3

路由器R1
version 12.4 ! hostname R1 ! ip cef ! interface Loopback0 ip address 10.10.10.10 255.255.255.240 ! interface Loopback1 ip address 20.20.20.20 255.255.255.240 ! interface Loopback2 ip address 30.30.30.30 255.255.255.240 ! interface Serial0/0 ip address 172.16.10.1 255.255.248.0 clock rate 2000000 ! router eigrp 100 network 10.10.10.0 0.0.0.15 network 20.20.20.16 0.0.0.15 network 30.30.30.16 0.0.0.15 network 172.16.8.0 0.0.7.255 no auto-summary !--- Auto-summary is disabled so that !--- the networks are summarized with subnets. ! end

路由器R1

version 12.4
!
hostname R1
!
ip cef
!
interface Loopback0
 ip address 10.10.10.10 255.255.255.240
!
interface Loopback1
 ip address 20.20.20.20 255.255.255.240
!
interface Loopback2
 ip address 30.30.30.30 255.255.255.240
!
interface Serial0/0
 ip address 172.16.10.1 255.255.248.0
 clock rate 2000000
!
router eigrp 100
 network 10.10.10.0 0.0.0.15
 network 20.20.20.16 0.0.0.15
 network 30.30.30.16 0.0.0.15
 network 172.16.8.0 0.0.7.255
 no auto-summary

!--- Auto-summary is disabled so that !--- the networks are summarized with subnets.

!
end

路由器R2
version 12.4 ! hostname R2 ! ip cef ! interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface Loopback1 ip address 2.2.2.2 255.255.255.255 ! interface Loopback2 ip address 3.3.3.3 255.255.255.255 ! interface Serial0/0 ip address 172.16.10.2 255.255.248.0 clock rate 2000000 ! interface Serial0/1 ip address 172.16.64.1 255.255.255.0 clock rate 2000000 ! router eigrp 100 network 1.0.0.0 network 3.0.0.0 network 172.16.8.0 0.0.7.255 auto-summary ! router ospf 100 log-adjacency-changes redistribute eigrp 100 redistribute connected network 2.2.2.2 0.0.0.0 area 0 network 172.16.64.0 0.0.0.255 area 0 ! end

路由器R2

version 12.4
!
hostname R2
!
ip cef
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface Loopback1
 ip address 2.2.2.2 255.255.255.255
!
interface Loopback2
 ip address 3.3.3.3 255.255.255.255
!
interface Serial0/0
 ip address 172.16.10.2 255.255.248.0
 clock rate 2000000
!
interface Serial0/1
 ip address 172.16.64.1 255.255.255.0
 clock rate 2000000
!
router eigrp 100
 network 1.0.0.0
 network 3.0.0.0
 network 172.16.8.0 0.0.7.255
 auto-summary
!
router ospf 100
 log-adjacency-changes
 redistribute eigrp 100 
 redistribute connected
 network 2.2.2.2 0.0.0.0 area 0
 network 172.16.64.0 0.0.0.255 area 0
!
end

路由器R3
version 12.4 ! hostname R3 ! ip cef ! interface Loopback0 ip address 11.1.1.1 255.255.255.255 ! interface Loopback1 ip address 12.1.1.1 255.255.255.255 ! interface Loopback2 ip address 13.1.1.1 255.255.255.255 ! interface Serial0/0 ip address 172.16.64.2 255.255.255.0 clock rate 2000000 ! router ospf 100 log-adjacency-changes network 11.1.1.1 0.0.0.0 area 0 network 12.1.1.1 0.0.0.0 area 0 network 13.1.1.1 0.0.0.0 area 0 network 172.16.64.0 0.0.0.255 area 0 ! end

路由器R3

version 12.4
!
hostname R3
!
ip cef
!
interface Loopback0
 ip address 11.1.1.1 255.255.255.255
!
interface Loopback1
 ip address 12.1.1.1 255.255.255.255
!
interface Loopback2
 ip address 13.1.1.1 255.255.255.255
!
interface Serial0/0
 ip address 172.16.64.2 255.255.255.0
 clock rate 2000000
!
router ospf 100
 log-adjacency-changes
 network 11.1.1.1 0.0.0.0 area 0
 network 12.1.1.1 0.0.0.0 area 0
 network 13.1.1.1 0.0.0.0 area 0
 network 172.16.64.0 0.0.0.255 area 0
!
end

驗證

檢驗連線的網路是否重分配到OSPF

使用本節內容，確認您的組態是否正常運作。

輸出直譯器工具(僅供已註冊客戶使用)(OIT)支援某些show命令。使用OIT檢視show命令輸出的分析。

使用show ip route ospf 命令檢驗路由器R3是否已收到重分發路由。

show ip route ospf
當在路由器R2中通過redistribute connected重新分發連線的路由時：在路由器R3中 R3#show ip route ospf 2.0.0.0/32 is subnetted, 1 subnets O 2.2.2.2 [110/65] via 172.16.64.1, 06:14:14, Serial0/0 !--- Only the classful routes are shown without actual subnets. 在路由器R2的redistribute connected subnets中使用subnets關鍵字的規范進行重分發時：在路由器R3中 R3#show ip route ospf 2.0.0.0/32 is subnetted, 1 subnets O 2.2.2.2 [110/65] via 172.16.64.1, 06:14:14, Serial0/0 R3#sh ip route ospf 1.0.0.0/32 is subnetted, 1 subnets O E2 1.1.1.1 [110/20] via 172.16.64.1, 00:00:02, Serial0/0 !--- When routes are redistributed in to OSPF, !--- OSPF uses 20 as the default metric if !--- the metric-type keyword is not mentioned !--- and the routes are redistributed as External Type 2(E2) routes. 2.0.0.0/32 is subnetted, 1 subnets O 2.2.2.2 [110/65] via 172.16.64.1, 06:36:58, Serial0/0 3.0.0.0/32 is subnetted, 1 subnets O E2 3.3.3.3 [110/20] via 172.16.64.1, 00:00:02, Serial0/0 172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks O E2 172.16.8.0/21 [110/20] via 172.16.64.1, 00:00:02, Serial0/0 !--- On specifying the keyword subnets, !--- the routes are reflected along with the subnets. !--- Only the classful routes are shown without actual subnets.

show ip route ospf

當在路由器R2中通過redistribute connected重新分發連線的路由時：在路由器R3中

R3#show ip route ospf
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 172.16.64.1, 06:14:14, Serial0/0

!--- Only the classful routes are shown without actual subnets.

在路由器R2的redistribute connected subnets中使用subnets關鍵字的規范進行重分發時：在路由器R3中

R3#show ip route ospf
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 172.16.64.1, 06:14:14, Serial0/0
R3#sh ip route ospf
     1.0.0.0/32 is subnetted, 1 subnets
O E2    1.1.1.1 [110/20] via 172.16.64.1, 00:00:02, Serial0/0

!--- When routes are redistributed in to OSPF, !--- OSPF uses 20 as the default metric if !--- the metric-type keyword is not mentioned !--- and the routes are redistributed as External Type 2(E2) routes.

     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 172.16.64.1, 06:36:58, Serial0/0
     3.0.0.0/32 is subnetted, 1 subnets
O E2    3.3.3.3 [110/20] via 172.16.64.1, 00:00:02, Serial0/0
     172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
O E2    172.16.8.0/21 [110/20] via 172.16.64.1, 00:00:02, Serial0/0

!--- On specifying the keyword subnets, !--- the routes are reflected along with the subnets.



!--- Only the classful routes are shown without actual subnets.

檢驗EIGRP路由重分發到OSPF

當使用redistribute eigrp < process id > 命令將EIGRP路由重分發到OSPF時，如果沒有指定metric-type關鍵字，則路由會重分發為E2路由，預設度量為20。

show ip route ospf
在路由器R2中使用redistribute eigrp 100命令重新分配EIGRP時：在路由器R3中 R3#show ip route ospf O E2 1.0.0.0/8 [110/20] via 172.16.64.1, 00:00:09, Serial0/0 2.0.0.0/32 is subnetted, 1 subnets O 2.2.2.2 [110/65] via 172.16.64.1, 07:03:16, Serial0/0 O E2 3.0.0.0/8 [110/20] via 172.16.64.1, 00:00:09, Serial0/0 172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks O E2 172.16.0.0/16 [110/20] via 172.16.64.1, 00:00:09, Serial0/0 !--- Only classful networks are redistributed by default. 在路由器R2的redistribute eigrp 100 subnets命令中指定subnet關鍵字時：在路由器R3中 R3#sh ip route ospf O E2 1.0.0.0/8 [110/20] via 172.16.64.1, 00:06:19, Serial0/0 2.0.0.0/32 is subnetted, 1 subnets O 2.2.2.2 [110/65] via 172.16.64.1, 07:09:26, Serial0/0 O E2 3.0.0.0/8 [110/20] via 172.16.64.1, 00:06:19, Serial0/0 20.0.0.0/28 is subnetted, 1 subnets O E2 20.20.20.16 [110/20] via 172.16.64.1, 00:00:06, Serial0/0 172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks O E2 172.16.0.0/16 [110/20] via 172.16.64.1, 00:06:19, Serial0/0 10.0.0.0/28 is subnetted, 1 subnets O E2 10.10.10.0 [110/20] via 172.16.64.1, 00:00:06, Serial0/0 30.0.0.0/28 is subnetted, 1 subnets O E2 30.30.30.16 [110/20] via 172.16.64.1, 00:00:06, Serial0/0 !--- On specifying the keyword subnets, !--- the subnetted routes are reflected along !--- with their subnet mask.

show ip route ospf

在路由器R2中使用redistribute eigrp 100命令重新分配EIGRP時：在路由器R3中

R3#show ip route ospf
O E2 1.0.0.0/8 [110/20] via 172.16.64.1, 00:00:09, Serial0/0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 172.16.64.1, 07:03:16, Serial0/0
O E2 3.0.0.0/8 [110/20] via 172.16.64.1, 00:00:09, Serial0/0
     172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
O E2    172.16.0.0/16 [110/20] via 172.16.64.1, 00:00:09, Serial0/0

!--- Only classful networks are redistributed by default.

在路由器R2的redistribute eigrp 100 subnets命令中指定subnet關鍵字時：在路由器R3中

R3#sh ip route ospf
O E2 1.0.0.0/8 [110/20] via 172.16.64.1, 00:06:19, Serial0/0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 172.16.64.1, 07:09:26, Serial0/0
O E2 3.0.0.0/8 [110/20] via 172.16.64.1, 00:06:19, Serial0/0
     20.0.0.0/28 is subnetted, 1 subnets
O E2    20.20.20.16 [110/20] via 172.16.64.1, 00:00:06, Serial0/0
     172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
O E2    172.16.0.0/16 [110/20] via 172.16.64.1, 00:06:19, Serial0/0
     10.0.0.0/28 is subnetted, 1 subnets
O E2    10.10.10.0 [110/20] via 172.16.64.1, 00:00:06, Serial0/0
     30.0.0.0/28 is subnetted, 1 subnets
O E2    30.30.30.16 [110/20] via 172.16.64.1, 00:00:06, Serial0/0

!--- On specifying the keyword subnets, !--- the subnetted routes are reflected along !--- with their subnet mask.

使用Subnet關鍵字將連線的網路重新分發到OSPF

下載選項

無偏見用語

關於此翻譯

目錄

簡介

必要條件

需求

採用元件

慣例

設定

網路圖表

組態

驗證

檢驗連線的網路是否重分配到OSPF

檢驗EIGRP路由重分發到OSPF

相關資訊

修訂記錄

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