Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF

A, OSPF basic concepts of
OSPF (Open Shortest Path First) is an interior gateway protocol (Interior Gateway Protocol, referred IGP). Relative to RIP, OSPF protocol is a link state the road, and the RIP is a distance vector routing protocol. Link is another way of saying router interface, also known as interface state so OSPF routing protocol. OSPF is established by the state of the network interface between the router advertisement link state database, to generate the shortest path tree, OSPF each router uses the shortest path routing table.


Second, on the OSPF experimental operation
1. Network requirements
• • All switches run OSPF, and the entire AS is divided into three areas.
• • Switch A and Switch B as ABR to forward routing information between areas.
• • After configuration, all switches can learn routes to all network segments in the AS
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
2 Step Configuration
(1) Configuration of IP addresses for the interfaces
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
Example SwitchB:
<H3C> SYS
[H3C] hostname SwitchB
[SwitchB] VLAN 100
[SwitchB-VLANs 100] Port G 1/0/10
[SwitchB-VLANs 100] quit
[SwitchB] VLAN 200 is
[SwitchB-VLAN200] Port G 1/0/20
[SwitchB-VLAN200] quit
[SwitchB] Inter VLAN 100
[SwitchB interface100--VLAN] IP 10.1.1.2 the Add 24
[SwitchB-of Vlan-interface100] quit
[SwitchB] Inter VLAN 200 is
[SwitchB-of Vlan-interface200] IP 10.3.1.1 the Add 24
[SwitchB-of Vlan-interface200] quit
[SwitchB]

(2) 配置 OSPF 基本配置
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
配置 Switch A。
<SwitchA> system-view
[SwitchA] router id 10.2.1.1
[SwitchA] ospf
[SwitchA-ospf-1] area 0
[SwitchA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0] quit
[SwitchA-ospf-1] area 1
[SwitchA-ospf-1-area-0.0.0.1] network 10.2.1.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.1] quit
[SwitchA-ospf-1] quit

Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF

配置 Switch B。
<SwitchB> system-view
[SwitchB] router id 10.3.1.1
[SwitchB] ospf
[SwitchB-ospf-1] area 0
[SwitchB-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] quit
[SwitchB-ospf-1] area 2
[SwitchB-ospf-1-area-0.0.0.2] network 10.3.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.2] quit
[SwitchB-ospf-1] quit
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
配置 Switch C。
<SwitchC> system-view
[SwitchC] router id 10.4.1.1
[SwitchC] ospf
[SwitchC-ospf-1] area 1
[SwitchC-ospf-1-area-0.0.0.1] network 10.2.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.1] network 10.4.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.1] quit
[SwitchC-ospf-1] quit
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
配置 Switch D。
<SwitchD> system-view
[SwitchD] router id 10.5.1.1
[SwitchD] ospf
[SwitchD-ospf-1] area 2
[SwitchD-ospf-1-area-0.0.0.2] network 10.3.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.2] network 10.5.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.2] quit
[SwitchD-ospf-1] quit

(3)验证配置
查看 Switch A 的 OSPF 邻居。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchA] display ospf peer verbose


查看 Switch A 的 OSPF 路由信息。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchA] display ospf routing


查看 Switch D 的 OSPF 路由信息。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchD] display ospf routing


在 Switch D 上使用 Ping 进行测试连通性。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchD] ping 10.4.1.1


3、实验操作2
配置OSPF引入自治系统外部路由

  1. 组网需求
    • • 所有的交换机都运行 OSPF,整个自治系统划分为 3 个区域。
    • • 其中 Switch A 和 Switch B 作为 ABR 来转发区域之间的路由。
    • • 在 Switch C 上配置为 ASBR 引入外部路由(静态路由),且路由信息可正确的在 AS 内传播。
    Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF

2.配置步骤
(1) 配置各接口的 IP 地址(略)
(2) 配置OSPF(同前例 )
(3) 配置引入自治系统外部路由
在 Switch C 上配置一条到目的网段 3.1.2.0/24 的静态路由。
<SwitchC> system-view
[SwitchC] ip route-static 3.1.2.1 24 10.4.1.2
在 Switch C 上配置 OSPF 引入静态路由。
[SwitchC] ospf 1
[SwitchC-ospf-1] import-route static
验证配置
查看 Switch D 的 ABR/ASBR 信息。
<SwitchD> display ospf abr-asbr
查看 Switch D 的 OSPF 路由表。
<SwitchD> display ospf routing


3、实验操作3
配置OSPF发布聚合路由
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF

  1. 组网需求
    • • Switch A 和 Switch B 位于 AS 200 内,AS 200 内使用 OSPF 作为 IGP 协议。
    • • Switch C、Switch D 和 Switch E 位于 AS 100 内,AS 100 内使用 OSPF 作为 IGP 协议。
    • • Switch B 和 Switch C 之间建立 EBGP 连接,配置 BGP 引入 OSPF 和直连路由,配置 OSPF
    进程引入 BGP 路由。
    • • 为了减小 Switch A 的路由表规模,在 Switch B 上配置路由聚合,只发布聚合后的路由
    10.0.0.0/8。

  1. 配置步骤
    (1) 配置接口的 IP 地址
    Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF

Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF

Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF

Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF

Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
(2) 配置 OSPF
配置 Switch A。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
<SwitchA> system-view
[SwitchA] router id 11.2.1.2
[SwitchA] ospf
[SwitchA-ospf-1] area 0
[SwitchA-ospf-1-area-0.0.0.0] network 11.2.1.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0] quit
[SwitchA-ospf-1] quit
配置 Switch B。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
<SwitchB> system-view
[SwitchB] router id 11.2.1.1
[SwitchB] ospf
[SwitchB-ospf-1] area 0
[SwitchB-ospf-1-area-0.0.0.0] network 11.2.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] quit
[SwitchB-ospf-1] quit
配置 Switch C。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
<SwitchC> system-view
[SwitchC] router id 11.1.1.2
[SwitchC] ospf
[SwitchC-ospf-1] area 0
[SwitchC-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] network 10.2.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] quit
[SwitchC-ospf-1] quit
配置 Switch D。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
<SwitchD> system-view
[SwitchD] router id 10.3.1.1
[SwitchD] ospf
[SwitchD-ospf-1] area 0
[SwitchD-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0] network 10.3.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0] quit
配置 Switch E。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
<SwitchE> system-view
[SwitchE] router id 10.4.1.1
[SwitchE] ospf
[SwitchE-ospf-1] area 0
[SwitchE-ospf-1-area-0.0.0.0] network 10.2.1.0 0.0.0.255
[SwitchE-ospf-1-area-0.0.0.0] network 10.4.1.0 0.0.0.255
[SwitchE-ospf-1-area-0.0.0.0] quit
[SwitchE-ospf-1] quit

(3) 配置 BGP,引入 OSPF 和直连路由
配置 Switch B。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchB] bgp 200
[SwitchB-bgp] peer 11.1.1.2 as 100
[SwitchB-bgp] address-family ipv4 unicast
[SwitchB-bgp-ipv4] import-route ospf
[SwitchB-bgp-ipv4] import-route direct
[SwitchB-bgp-ipv4] peer 11.1.1.2 enable 注意不要少了这句
[SwitchB-bgp-ipv4] quit
[SwitchB-bgp] quit
配置 Switch C。
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchC] bgp 100
[SwitchC-bgp] peer 11.1.1.1 as 200
[SwitchC-bgp] address-family ipv4 unicast
[SwitchC-bgp-ipv4] import-route ospf
[SwitchC-bgp-ipv4] import-route direct
[SwitchC-bgp-ipv4] peer 11.1.1.1 enable #注意不要少了这句
[SwitchC-bgp-ipv4] quit
[SwitchC-bgp] quit

(4) arranged OSPF into BGP routes on Switch B and Switch C
configuration OSPF into BGP routes on Switch B.
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchB] OSPF
[OSPF--SwitchB. 1] Import-BGP route
configured OSPF into BGP routes on Switch C.
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchC] OSPF
[OSPF--SwitchC. 1] Import-route BGP
routing table of SwitchA.
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchA] display ip routing-table

(5) arranged on the route aggregation Switch B, only the summary route 10.0.0.0/8.
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchB-ospf-1] asbr -summary 10.0.0.0 8
See Switch A's routing table.
Basic Concepts and OSPF DR / BDR virtual link and experimental operation of the special area OSPF
[SwitchA] display ip routing-table

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Origin blog.51cto.com/14220480/2402412