? ? ? ? ? ? ? ??ISIS

特點(diǎn)：較快的會(huì)聚速度，高穩(wěn)定性，可擴(kuò)展性 默認(rèn)度量值都是10 NSAP地址 相當(dāng)于ospf里的router-id 都是唯一的！通過LSP獲取區(qū)域路徑] network-entity的格式：Area = 49.0001, System ID = aaaa.bbbb.cccc, NSEL = 00 area：為可變長度部分，范圍為1-13個(gè)字節(jié)。 System ID：是IS或ES在區(qū)域內(nèi)的唯一標(biāo)識(shí)，總共為6個(gè)字節(jié)，可以使用MAC地址或由IP地址轉(zhuǎn)化得到。 NSEL：service identifier，共一個(gè)字節(jié)。（00表示在ip環(huán)境） AFI=49為私有地址空間，類似于私有的IP地址 R1>en?????? R1#conf t R1(config)#inter loop 0?????配置環(huán)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???????運(yùn) 行isis協(xié)議 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鄰居關(guān)系?發(fā)現(xiàn)有2個(gè)?優(yōu)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???把類型改成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?????發(fā)現(xiàn)只有一個(gè)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換 ⒈ L1，Level 1，只負(fù)責(zé)區(qū)域內(nèi)路由，類似于OSPF的內(nèi)部非骨干路由器。只能通告給L1和L1/L2。 ⒉ L2，Level 2，只負(fù)責(zé)區(qū)域間路由，類似于OSPF的骨干路由器。L2和L1/L2。 ⒊L1/L2，Level 1-2，同時(shí)負(fù)責(zé)區(qū)域內(nèi)和區(qū)域間路由，類似于OSPF的ABR。包含兩個(gè)獨(dú)立的Level 1 和Level 2數(shù)據(jù)庫。但它不向L1路由器通告L2路由，所以L1路由器不會(huì)學(xué)到區(qū)域外的路由，這有點(diǎn)像OSPF的完全末節(jié)區(qū)域。 ?NET算法 例如：202.106.1.1??32位表示成48位 202.106.001.001????2021.0600.1001
本文轉(zhuǎn)自 cs312779641 51CTO博客，原文鏈接:http://blog.51cto.com/chenhao6/1176056

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