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 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
 
     3.0.0.0/32 is subnetted, 1 subnets
i L1    3.3.3.3 [115/20] via 192.168.34.3, FastEthernet0/0
     4.0.0.0/32 is subnetted, 1 subnets
C       4.4.4.4 is directly connected, Loopback0
i L1 192.168.23.0/24 [115/20] via 192.168.34.3, FastEthernet0/0
C    192.168.34.0/24 is directly connected, FastEthernet0/0
i*L1 0.0.0.0/0 [115/10] via 192.168.34.3, FastEthernet0/0
R4#ping 1.1.1.1
 
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!
R4#show isis neighbors
 
System Id      Type Interface IP Address      State Holdtime Circuit Id
R3             L1   Fa0/0     192.168.34.3    UP    29       R4.01
R3             L2   Fa0/0     192.168.34.3    UP    26       R4.01
R4#conf t
R4(config)#router isis
R4(config-router)#is-type level-1
R4(config-router)#end
R4#end
*Mar  1 00:15:09.095: %SYS-5-CONFIG_I: Configured from console by console
R4#ping 1.1.1.1
 
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
.....
 
R4#ping 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
U.U.!
Success rate is 20 percent (1/5), round-trip min/avg/max = 120/120/120 ms
R4#ping 1.1.1.1
 
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 48/70/108 ms
R4#
R4#write
Building configuration...
[OK]
 
S-IS路由器角色和信息交换
⒈ L1,Level 1,只负责区域内路由,类似于OSPF的内部非骨干路由器。只能通告给L1和L1/L2。
⒉ L2,Level 2,只负责区域间路由,类似于OSPF的骨干路由器。L2和L1/L2。
⒊L1/L2,Level 1-2,同时负责区域内和区域间路由,类似于OSPF的ABR。包含两个独立的Level 1 和Level 2数据库。但它不向L1路由器通告L2路由,所以L1路由器不会学到区域外的路由,这有点像OSPF的完全末节区域。
 NET算法 例如:202.106.1.1  32位表示成48位 202.106.001.001    2021.0600.1001