IS-IS v1.0 Chapter 0 Preface Statement BSCI Building Scalable Cisco Internetworks Configuring IS-IS Protocol IS-IS IS-IS OSI TCP/IP IS-IS OSPF Cisco System BSCI Student Guide Outline 1 OSI IS-IS 2 IS-IS 3 IS-IS IP OSI 4 IS-IS About author Climber from Changchun City Jilin Prov. Surf on the net for six years Wander regularly in the cisco forum of netease Discussion is welcome! e-mail:tiejun@163.net or climbmount@163.com Deeply appreciated my secretary for her help!
Chapter 1 Introduction to OSI Protocol OSI ISO OSI ISO International Organization for Standardization OSI Open System Interconnection ISO TCP/IP TCP/IP OSI ISO OSI ITU-T OSI TCP/IP OSI TCP/IP OSI OSI Hierarchical NSAP Network Service Access Point OSI TCP/IP IP + ES End system IS Intermediate System Area Domain Area Area Domain Area Domain Domain Area OSPF Area ES ES IS
illustrate ONLY the portion around with red block CLNS Connectionless Network Service CLNP Connectionless Network Protocol CMNS Connection-Mode Network Service CONP Connection-Oriented Network Protocol TCP/IP TCP UDP OSI CLNP CLNS CONP CMNS OSI CLNP IP CONP IP TCP/IP CLNP CLNP routing protocols CONP X.25 OK John
Chapter 2 Basic IS-IS Routing Protocol IS-IS IS-IS 1 Level-0 ES IS Discovery Protocol TCP/IP ARP 2 Level-1 OSPF O 3 Level-2 OSPF O IA 4 Level-3 TCP/IP BGP AS Level-1 Level-2 OSI 1 IS-IS OSI TCP/IP Dual Mode 2 ISO-IGRP CLNS OSI OSI CLNS 3 Static CLNS routes OSI TCP/IP Static route LAB IS-IS OSPF IS-IS OSPF SPF TCP/IP IS-IS OSPF ISP IS-IS OSPF OSPF ABR IS-IS OSPF Backbone Virtual-Link IS-IS OSPF LSA IS-IS LSA OSPF IS-IS Demand Circuit OSI Address OSI
NSAP OSI Student Guide So Go ahead,don t give it up! NSAP Network Service Access Point NSAP IDP Inter-Domain Portion TCP/IP DSP Domain Service Portion TCP/IP IDP AFI Authority and Format ID IDI Inter-Domain ID DSP HODSP High Order DSP DSP TCP/IP SID System ID ID TCP/IP HSEL NSAP-Selector NSAP TCP/IP ISO-IGRP IDP HODSP ID System ID IS-IS ID IDP+HODSP ID System ID NSAP Cisco IS-IS NSEL ID 6 1-13 NSAP 8-20 Cisco ISO-IGRP Area ID Domain ID Area ID Area ID 2 Domain ID NSAP 10-20
NET Network Entity Title NSEL NSEL 00 NSAP NET AFI=49 OSI TCP/IP 10.0.0.0 172.16.0.0-172.31.0.0 192.168.0.0 IS-IS IP AFI=39 ISO AFI=47 ISO NET 00 dot System ID MAC IP Domain ID Area ID 1 NSAP=47.0001.aaaa.bbbb.cccc.00 IS-IS: Area = 47.0001, System ID = aaaa.bbbb.cccc, NSEL = 00 ISO-IGRP: Domain = 47 Area = 0001, System ID = aaaa.bbbb.cccc, NSEL = 00 2 NSAP=39.0f01.0002.0000.0c00.1111.00 IS-IS: Area = 39.0f01.0002, Sysem ID = 0000.0c00.1111, NSEL = 00 ISO-IGRP: Domain= 39.0f01 Area = 0002, System ID = 0000.0c00.1111, NSEL = 00 1 Area ID 2 ES Area ID IS 3 Level-1 IS System ID IS System ID 4 Level-2 IS System ID 5 DLCI System ID LAN ID Area IS Area System ID 6 System ID IS-IS: possible duplicate system ID <sys_id> detected IS-IS PDU-Protocol Data Unit IS-IS 1 Hello PDU ESH ES IS ISH IS ES IIH IS 2 LSP Link-state Packet
3 PSNP Partial sequence number PDU 4 CSNP Complete sequence number PDU 5 OSI PDU Datagram or Packet PDU Frame IS-IS LANs IS-IS LANs All others OSPF OSPF NBMA IS-IS NBMA Link-state Packet 1 LSP 2 LSP ID sequence number 1 Overflow 1LSP/sec 120 DoS IS OSPF 3 1200 0 4 IS ES 5 6 IP IS-IS IS-IS DIS OSPF DR OSPF DR BDR SPF IS-IS IS-IS DIS Designated Intermediate System Pseudonodes DIS OSPF DR IS-IS OSPF DR-Other About Metric IS-IS default metric ToS DTR Delay Expense Reliability metric 6bits 24bits metric-style
The role of routers IS-IS 1 L1 Level 1 OSPF Level 1 ES ES Level 1 Level-1 2 L2 Level 2 OSPF OSPF 0 Level 2 3 L1/L2 Level 1-2 OSPF ABR Level 1 Level 2 L1 L2 L1 OSPF 4 L1/L2 L1 L1 L1/L2 L2 IS-IS LANs LSPs All others LSPs Hello PDU ESH ES IS ISH IS ES IIH IS ES ISH IS IS ES IS ESH ES LSPs LANs L1 L2 Hello Packet P2P Hello Packet Hello Interval=10s Dead Interval=30s L1 L2 IS-IS LANs WANs L1 L2
L1 IS L2 PSNP P2P LSPs CSNP LAN DIS 10s P2P LS LSPs LSPs SPF LS Up/Down or Metric IS-IS LSPs LSPs IS LSPs OSPF OK Let s take a rest! CCIE 1561 LAB Title
Chapter 3 IP and OSI Routing with Integrated IS-IS IS-IS IP OSI IS-IS OSI IP IS-IS VLSM Redistribution IP Summarization NET SPF OSI SPF L1 L2 PRC Partial route calculation ES IP IS-IS ES OSI Area Routing OSI Level 1 System ID Level 1-2 Level 2 Area Address Area cost System ID Level 2 Level 1-2 Level 1 Level 2 Level 1 Level 1-2 IS-IS IP BGP CLNS ISO-IGRP CLNS
IS-IS show isis topology NET Dynamic Hostname Mapping show clns route CLNS NET L1 NET show isis route NET Dynamic Hostname Mapping L1 L1-L2 L1 which-route NSAP NSAP IP PRC Partial route calculation ES IP IP IP IS-IS IP IP IS-IS i I L1 L2 IS-IS Cisco NASDAQ Cisco Microsoft
Chapter 4 Integrated IS-IS Routing Protocol Configuration IS-IS NETs IS-IS IS-IS NET IS-IS loopback 1. Router(config)# router isis [tag] IS-IS tag IS-IS 2. Router(config-router)# net network-entity-title NET IP 3. Router(config-if)# ip router isis IS-IS IP 4. Router(config-if)# clns router isis IS-IS CLNS 5. Router(config-router)# is-type {level-1 level-1-2 level-2-only} L1/L2 Station/Area 6. Router(config-if)# is-circuit-type {level-1 level-1-2 level-2-only} L1/L2 7. Router(config-if)# isis metric default-metric {level-1 level-2} 10 IOS 12.0 Manual 1 Router(config-if)# isis hello-interval seconds {level-1 level-2} Hello 10s 2 Router(config-if)# isis hello-multiplier multiplier {level-1 level-2} Dead Interval Hello Interval 3 3 Router(config-if)# isis priority value {level-1 level-2} 0-127, 64, 0 DIS 4 Router(config-if)# isis password password {level-1 level-2} 5 Router(config-router)# summary-address address mask {level-1 level-1-2 level-2}
IS-IS router isis net 01.0001.0000.0000.0002.00 interface ethernet 0 ip address 10.1.1.1 255.255.255.0 ip router isis isis circuit-type level-2 isis metric 20 level-2 interface serial 0 ip address 10.1.2.1 255.255.255.0 ip router isis isis circuit-type level-1 IS-IS 1 show clns CLNS 2 show clns protocol [tag] show ip protocol 3 show clns interface [type number] DIS 4 show clns neighbors [type number] [detail] 5 show isis topology/route / IS-IS 6 show clns route show ip route CLNS 7 show isis database 8 show ip protocol IP 9 show ip route [address [mask] ] [protocol [process-id as-number] ] Integrated IS-IS in WAN network IS-IS WAN Leased Line Circuit Switched Packet Switched IS-IS IS-IS
NBMA IS-IS IS-IS ip unnumbered NBMA IS-IS NBMA WAN Hello NBMA FR interface Serial0/0 encapsulation frame-relay! interface Serial0/0.1 point-to-point ip address 10.1.1.1 255.255.255.252 ip router isis frame-relay interface-dlci 100! interface Serial0/0.2 point-to-point ip address 10.1.1.5 255.255.255.252 ip router isis frame-relay interface-dlci 200! interface Serial0/0.3 point-to-point ip address 10.1.1.9 255.255.255.252 ip router isis frame-relay interface-dlci 300 FR interface Serial0/0! encapsulation frame-relay interface Serial0/0.2 multipoint ip address 10.0.0.4 255.0.0.0 ip router isis frame-relay map clns 100 broadcast // OSI map IP frame-relay map clns 200 broadcast
frame-relay map clns 300 broadcast frame-relay interface-dlci 100 frame-relay interface-dlci 200 frame-relay interface-dlci 300! router isis net 00.0001.0000.0000.0004.00 FR IS-IS 1 UP show cdp neighbor detail show clns neighbor debug isis adj-packet show clns neighbor IS-IS not ES-IS UP not Init 2 LSPs show isis database detail 3 LSPs Flooding show clns traffic debug isis local-updates debug isis update-packet 4 SPF show isis topology show isis route show ip route Old command 5 show process cpu R2 R4 NBMA R4 R2 show clns neighbors R2#show clns neighbors System Id Interface SNPA State Holdtime Type Protocol 0000.0000.0004 Se0/0.2 DLCI 300 Up 8 L1 IS-IS R5 Et0/0 0050.3ef1.5960 Up 8 L2 IS-IS R1 Se0/0.1 DLCI 100 Up 23 L1 IS-IS R4#show clns neighbors System Id Interface SNPA State Holdtime Type Protocol R6 Et0/0 0010.117e.74a8 Up 26 L2 IS-IS
R3 Se0/0.3 DLCI 400 Up 28 L2 IS-IS 0000.0000.0002 Se0/0.2 DLCI 300 Init 29 L1 IS-IS 0000.0000.0001 Se0/0.1 DLCI 200 Up 290 IS ES-IS Hello packet P2MP LAN IIHs P2P P2P IIHs P2MP P2P
Afterwords Climber in Changchun Oct. 2002