CCNP学习之路由协议ISIS
IS-IS所有连续的L2或者L1-2构成IS-IS的逻辑骨干区。
IIHIS-IS间的HELLO包
Integrated IS-IS NSAP Address Structure
--IDP-------------------------DSP--------------------AFIIDI High-Order DSP System ID NSEL
|<--------Variable-Lenagth----->|<----6Bytes--->|1Byte| Area Address
IDP(Initial Domain Part)AFI(Authority Format ID) 49(私有,16进制)
IDI(Initial Domain ID) 47.000547.0006
DSP(Domain Sepcific Part)HODSP(Area) System ID(IP/MAC)NSAP-Selector(0x00)
如：Public IP202.1.3.10202.001.003.010
2020.0100.3010
NSAP地址规划
必须要以一个字节开始，以一个字节结束。如：49.0001.0000.0c22.2222.00
R1(config)#router isisR1(config-router)#net 49.0001.1111.1111.1111.00 //配置NET地址R1(config-router)#log-adjacency-changes all //当邻居DOWN时log提示R1(config)#interface s1/0 //将接口通告进ISISR1(config-if)#ip route isis
R1(config-if)#isis metric 5//修改metric值选路R1(config-if)#isis circuit-type level-1/1-2/2-only//将层次细化到某个接口
R1#show clns neighbors //查看ISIS邻居R1#show isis hostname //查看System ID与Hostname映射表R1#show isis database //查看ISIS数据库R1#show isis databaseverbose//查看ISIS数据库明细R1#show clns is-neighborsR1#show clns interfaceR1#show clns protocol
清除ISIS邻居:R1#clear isis * //清除ISIS所有信息R1#clear clns neighbors //清除ISIS邻居信息
ISIS优化：R2(config)#router isisR2(config-router)#is-type level-1
R3(config)#router isisR3(config-router)#is-type level-2
Route Leaking(路由泄漏)
R1(config-router)#redistribute isis ip level-2 into level-1 distribute-list 100R1(config)#access-list 100 permit ip 3.3.3.0 0.0.0.0 any
封装：
UDP RIPIP EIGRPIP OSPFL2H ISIS
组播地址：Level-1: 01:80:C2:00:00:14Level-2: 01:80:C2:00:00:15
IS-IS PDUS(IS-IS报文):
Hello(ESH,ISH,IIH)LSPPSNP(Partial sequence number PDU) LSR/ACKCSNP(Complete sequence number PDU) DBD
IS-IS Network Type:
PSNP CSNPBroadcast Request(LSR) 由DIS每10S发一次Point-to-Point ACK 邻居建立只发一次
DIS选举方式：1.Highest interface priority(较高优先级) 642.Highest SNPA(MAC) breaks ties
ISIS配置实验：
R2(s1/0)------(s1/0)R1(s1/1)------(s1/0)R3
配置脚本：
----R1----------------------------------------------------------------------
R1#sh runBuilding configuration...
Current configuration : 1307 bytes!version 12.2service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname R1!!ip subnet-zero!!no ip domain lookup!ip cef!!voice call carrier capacity active!!!interface Loopback0ip address 1.1.1.1 255.255.255.0ip router isis!interface FastEthernet0/0no ip addressshutdownduplex half!interface Serial1/0ip address 12.1.1.1 255.255.255.0ip router isisserial restart_delay 0! interface Serial1/1ip address 13.1.1.1 255.255.255.0ip router isisserial restart_delay 0!router isisnet 49.0001.1111.1111.1111.00log-adjacency-changes all!ip classlessno ip http server!! call rsvp-sync!!mgcp profile default!dial-peer cor custom!!gatekeepershutdown!!line con 0exec-timeout 0 0logging synchronousline aux 0line vty 0 4!!end
---R2-----------------------------------------------------------
R2#sh runBuilding configuration...
Current configuration : 1280 bytes!version 12.2service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname R2!!ip subnet-zero!!no ip domain lookup!ip cef!!voice call carrier capacity active!!!interface Loopback0ip address 2.2.2.2 255.255.255.0ip router isis!interface FastEthernet0/0no ip addressshutdownduplex half!interface Serial1/0ip address 12.1.1.2 255.255.255.0ip router isisserial restart_delay 0! router isisnet 49.0001.2222.2222.2222.00log-adjacency-changes all!ip classlessno ip http server!! call rsvp-sync!!mgcp profile default!dial-peer cor custom!!!!gatekeepershutdown!!line con 0exec-timeout 0 0logging synchronousline aux 0line vty 0 4!!end
----R3-----------------------------------------------------------
R3#sh runBuilding configuration...
Current configuration : 1280 bytes!version 12.2service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname R3!!ip subnet-zero!!no ip domain lookup!ip cef!!voice call carrier capacity active!!!interface Loopback0ip address 3.3.3.3 255.255.255.0ip router isis!interface FastEthernet0/0no ip addressshutdownduplex half!interface Serial1/0ip address 13.1.1.3 255.255.255.0ip router isisserial restart_delay 0! router isisnet 49.0001.3333.3333.3333.00log-adjacency-changes all!ip classlessno ip http server!!!!! call rsvp-sync!!mgcp profile default!dial-peer cor custom!!!!gatekeepershutdown!!line con 0exec-timeout 0 0logging synchronousline aux 0line vty 0 4!!end
-------------------------------------------------------------------------------
测试：R3# ping 2.2.2.2
Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 48/92/160 msR3#
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