ISP 使用的 ISIS 链路状态路由协议

最编程 2024-04-07 09:15:20

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ISIS

特点：较快的会聚速度，高稳定性，可扩展性默认度量值都是10

NSAP地址相当于ospf里的router-id 都是唯一的！通过LSP获取区域路径]

network-entity的格式：Area = 49.0001, System ID = aaaa.bbbb.cccc, NSEL = 00

area：为可变长度部分，范围为1-13个字节。

System ID：是IS或ES在区域内的唯一标识，总共为6个字节，可以使用MAC地址或由IP地址转化得到。

NSEL：service identifier，共一个字节。（00表示在ip环境）

AFI=49为私有地址空间，类似于私有的IP地址

R1>en

R1#conf t

R1(config)#inter loop 0 配置环回口

R1(config-if)#ip address 1.1.1.1 255.255.255.255

R1(config-if)#no shut

R1(config-if)#inter f0/0 物理地址

R1(config-if)#ip address 192.168.12.1 255.255.255.0

R1(config-if)#no shut

R1(config-if)#end

R1(config)#router isis

R1(config-router)#net 49.0001.0001.0001.0001.00 ISIS NET地址

R1(config-router)#ex

R1(config)#inter f0/0 运行isis协议

R1(config-if)#ip router isis

R1(config-if)#inter loop 0

R1(config-if)#ip router isis

R1(config-if)#end

R1#show isis neighbors 查看isis邻居关系发现有2个优化一下

System Id Type Interface IP Address State Holdtime Circuit Id

R2 L1 Fa0/0 192.168.12.2 UP 8 R2.01

R2 L2 Fa0/0 192.168.12.2 UP 8 R2.01

R1#conf t

R1(config)#router isis

R1(config-router)#is-type level-1 把类型改成1

R1(config-router)#end

R1#show isi neighbors

System Id Type Interface IP Address State Holdtime Circuit Id

R1#show isi neighbors

System Id Type Interface IP Address State Holdtime Circuit Id 发现只有一个了

R2 L1 Fa0/0 192.168.12.2 UP 9 R2.01

R2配置：

R2>en

R2#conf t

R2(config)#inter f0/0

R2(config-if)#ip address 192.168.12.2 255.255.255.0

R2(config-if)#no shut

R2(config-if)#inter f0/1

R2(config-if)#ip address 192.168.23.2 255.255.255.0

R2(config-if)#inter loop 0

R2(config-if)#ip address 2.2.2.2 255.255.255.255

R2(config-if)#no shut

R2(config-if)#ex

R2(config)#router isis

R2(config-router)#net 49.0001.0002.0002.0002.00

R2(config-router)#ex

R2(config)#inter f0/0

R2(config-if)#ip router isis

R2(config-if)#inter f0/1

R2(config-if)#ip router isis

R2(config-if)#int loop 0

R2(config-if)#ip router isis

R3配置

R3>en

R3#conf t

R3(config)#inter loop 0

R3(config-if)#ip address 3.3.3.3 255.255.255.255

R3(config-if)#no shut

R3(config-if)#inter f0/0

R3(config-if)#ip address 192.168.23.3 255.255.255.0

R3(config-if)#no shut

R3(config-if)#inter f0/1

R3(config-if)#ip address 192.168.34.3 255.255.255.0

R3(config-if)#no shut

R3(config)#router isis

R3(config-router)#net 49.0002.0003.0003.0003.00

R3(config-router)#ex

R3(config)#inter f0/0

R3(config-if)#ip router isis

R3(config-if)#inter f0/1

R3(config-if)#ip router isis

R3(config-if)#inter loop 0

R3(config-if)#ip router isis

R3(config-if)#end

R3#show ip route

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

i L2 192.168.12.0/24 [115/20] via 192.168.23.2, FastEthernet0/0

1.0.0.0/32 is subnetted, 1 subnets

i L2 1.1.1.1 [115/30] via 192.168.23.2, FastEthernet0/0

2.0.0.0/32 is subnetted, 1 subnets

i L2 2.2.2.2 [115/20] via 192.168.23.2, FastEthernet0/0

3.0.0.0/32 is subnetted, 1 subnets

C 3.3.3.3 is directly connected, Loopback0

4.0.0.0/32 is subnetted, 1 subnets

i L1 4.4.4.4 [115/20] via 192.168.34.4, FastEthernet0/1

C 192.168.23.0/24 is directly connected, FastEthernet0/0

C 192.168.34.0/24 is directly connected, FastEthernet0/1

R3#write

Building configuration...

[OK]

R4配置：

R4>en

R4#conf t

R4(config)#inter f0/0

R4(config-if)#ip address 192.168.34.4 255.255.255.0

R4(config-if)#no shut

R4(config-if)#inter loop 0

R4(config-if)#ip address 4.4.4.4 255.255.255.255

R4(config-if)#no shut

R4(config-if)#ex

R4(config)#router isis

R4(config-router)#net 49.0002.0004.0004.0004.00

R4(config-router)#ex

R4(config)#inter f0/0

R4(config-if)#ip router isis

R4(config-if)#inter loop 0

R4(config-if)#ip router isis

R4(config-if)#end

R4#show ip rout

*Mar 1 00:11:46.507: %SYS-5-CONFIG_I: Configured from console by console

R4#show ip rout

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 192.168.34.3 to network 0.0.0.0

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