The NSAP address A network entity title (NET) is an NSAP with an n-selector of zero. AFI 为 1 byte 通常 lab 都用 49 (保留用) System ID 为 6 bytes ( 就是 MAC Address 但也可以自订) NSEL 在这为 00 1 byte Area Address 为可变长度字段 1byte ~ 13 bytes 例: 49.0001.1111.1111.1111.00 1111.1111.1111 为 MAC Address 值 49.0001 为 Area Address
! interface Ethernet0 ip address 172.16.12.1 255.255.255.0 ip router isis
!--- Assigns IP address to interface Ethernet0 !--- and enables IS-IS for IP on the interface. ! router isis net 49.0001.1111.1111.1111.00 ! !--- Enables the IS-IS PRocess on the router, !--- and assigns area and system ID to router.
! hostname R1 ! enable passWord cisco ! ip subnet-zero clns routing !----有激活 clns 的 routing ! ! interface Ethernet0 no ip address no ip directed-broadcast shutdown ! interface Ethernet1 no ip address no ip directed-broadcast shutdown ! interface Serial0 ip address 192.168.1.2 255.255.255.0 no ip directed-broadcast ip router isis !----激活 ip routing no ip mroute-cache clockrate 1300000 clns router isis !----激活 clns routing isis circuit-type level-1 !----宣告 serial 0 用 level-1 routing ! interface Serial1 ip address 10.10.10.1 255.255.255.0 no ip directed-broadcast ip router isis clockrate 1300000 clns router isis isis circuit-type level-2-only !----宣告 serial 1 用 level-2 routing ! router isis net 49.0001.1111.1111.1111.00 !----激活 isis routing process 与 输入 nsap address ! ip classless ! ! ! line con 0 transport input none line aux 0 line vty 0 4 password cisco login ! end
R1# R1# R1#sh ip route Codes: C - connected, S - static, I - IGRP, 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, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR
Gateway of last resort is not set
172.168.0.0/24 is subnetted, 1 subnets i L1 172.168.1.0 [115/20] via 192.168.1.1, Serial0 172.31.0.0/24 is subnetted, 1 subnets i L2 172.31.1.0 [115/50] via 10.10.10.2, Serial1 10.0.0.0/24 is subnetted, 2 subnets C 10.10.10.0 is directly connected, Serial1 i L2 10.10.20.0 [115/30] via 10.10.10.2, Serial1 C 192.168.1.0/24 is directly connected, Serial0 i L2 192.168.2.0/24 [115/20] via 10.10.10.2, Serial1 i L2 192.168.3.0/24 [115/40] via 10.10.10.2, Serial1 R1#
Show Level-1 Routing Table R1#sh isis route IS-IS Level-1 Routing Table - version 15 System Id Next-Hop Interface SNPA Metric State 1111.1111.1111 -- 2222.2222.2222 2222.2222.2222 Se0 *HDLC* 10 Up R1#
Show Level-2 Routing Table R1#sh clns route CLNS Prefix Routing Table 49.0001.1111.1111.1111.00, Local NET Entry 49.0003 [110/30] via 3333.3333.3333, IS-IS, Up, Serial1 49.0002 [110/10] via 3333.3333.3333, IS-IS, Up, Serial1 49.0001 [110/0] via 1111.1111.1111, IS-IS, Up R1#
R1#sh isis topology IS-IS paths to level-1 routers System Id Metric Next-Hop Interface SNPA 1111.1111.1111 -- 2222.2222.2222 10 2222.2222.2222 Se0 *HDLC*
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.168.1.1, timeout is 2 seconds: !!!!! SUCcess rate is 100 percent (5/5), round-trip min/avg/max = 4/5/8 ms
