1. Supplement to “Introduction to IS-IS” presented at NANOG 20 Greg Hankins

2. Introduction These slides supplement the “Introduction to IS-IS” tutorial, presented at NANOG 20. These slides supplement the “Introduction to IS-IS” tutorial, presented at NANOG 20. Riverstone-specific configurations and commands are provided as a companion to the tutorial. Riverstone-specific configurations and commands are provided as a companion to the tutorial. The complete tutorial is available at: http://www.nanog.org/mtg-0010/isis.html The complete tutorial is available at: http://www.nanog.org/mtg-0010/isis.html

3. interface create ip pos3/1 address- netmask 10.1.1.1/30 port so.3.1 interface create ip fe1/1 address-netmask 12.1.1.2/24 port et.1.1 interface create ip gi2/1 address-netmask 192.168.2.1/24 port gi.2.1 interface add ip lo0 address-netmask 13.1.1.2/32 ! isis add area 49.0001 isis add interface pos3/1 isis add interface fe1/1 isis set system-id 0000.0000.0002 isis start ! ip-router policy redistribute from-proto direct to-proto isis-level-1 ! system set name RS2 interface create ip pos3/1 address- netmask 10.1.1.2/30 port so.3.1 interface create ip fe1/1 address-netmask 192.168.4.1/24 port et.1.1 interface add ip lo0 address-netmask 13.1.1.4/32 ! isis add area 49.0002 isis add interface pos3/1 isis set system-id 0000.0000.0004 isis start ! ip-router policy redistribute from-proto direct to-proto isis-level-1 ! system set name RS4 Basic Configuration.8.2.1 10.1.1.0/30 RS1 pos3/1 RS2 12.1.1.0/24.2 fe1/1 RS4 pos3/1 fe1/1 fe2/1 192.168.1.1/24 192.168.2.1/24 192.168.4.1/24 gi2/1

4. Verifying Operation isis show adjacencies RS2# isis show adjacencies Adjacencies Circuit name: pos3/1 SystemID: 0000.0000.0400 State: up Usage: l2 Type: is Hold: 30 3-way: Neighbor Circuit: 00000005 Areas: 49.0002 Supported protocols: inet4 Ifaddr: 10.1.1.2 Circuit name: fe1/1 Level 1 adjacencies: 1 SystemID: 0000.0000.0100 Snpa: 802.2 0:e0:63:18:f6:61 Pri: 64 State: up Type: l1-is Hold: 9 Areas: 49.0001 Supported protocols: inet4 Ifaddr: 12.1.1.8 No level 2 adjacencies

5. Verifying Operation isis show circuits RS2# isis show circuits Circuits Name: pos3/1 Index: 6 Encap: iso Level: 1 and 2 Snpa: 802.2 0:0:1d:ce:a8:7d Mtu: 1499 Metric: 10 Name: fe1/1 Index: 7 Encap: iso Level: 1 Snpa: 802.2 0:0:1d:ce:a8:7d Mtu: 1497 Metric: 10 Level 1 Priority: 64 Lanid: 0000.0000.0100.05 Flags: <> Level 2 Priority: 64 Lanid: 0000.0000.0200.07 Flags: <>

6. Verifying Operation isis show lsp-database RS2# isis show lsp-database Task ISIS: Link State Database IS-IS Level-1 Link State Database (* - originated local) LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL 0000.0000.0100.0000 0X00000006 0X4334 602 0/0/0 0000.0000.0100.0500 0X00000005 0XEBE8 675 0/0/0 0000.0000.0200.0000* 0X00000010 0X1B9A 722 1/0/0 IS-IS Level-2 Link State Database (* - originated local) LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL 0000.0000.0200.0000* 0X00000028 0XD876 651 0/0/0 0000.0000.0400.0000 0X00000021 0XAA50 799 0/0/0

7. Verifying Operation isis show lsp-database level N detail RS2# isis show lsp-database level 1 detail id 0000.0000.0200 Task ISIS: Link State Database IS-IS Level-1 Link State Database (* - originated local) LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL 0000.0000.0200.0000* 0X00000010 0X1B9A 610 1/0/0 Area Addresses: 49.0001 NLPID: 0XCC IP Address: 10.1.1.1 IP Address: 12.1.1.2 Metric: 10 IS 0000.0000.0100.05 Metric: 10 IP 10.1.1/30 Metric: 10 IP 12.1.1/24 ipextreach: 192.168.2/24 default int 0

8. Verifying Operation isis show lsp-database level N detail RS2# isis show lsp-database level 2 detail id 0000.0000.0200 Task ISIS: Link State Database IS-IS Level-2 Link State Database (* - originated local) LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL 0000.0000.0200.0000* 0X00000028 0XD876 401 0/0/0 Area Addresses: 49.0001 NLPID: 0XCC Metric: 10 IS 0000.0000.0400.00 Metric: 10 IP 10.1.1/30 Metric: 10 IP 12.1.1/24 ipextreach: 192.168.2/24 default int 0 192.168.1/24 default int 10

9. Verifying Operation isis show lsp-database level N detail RS2# isis show lsp-database level 1 detail id 0000.0000.0100.05 Task ISIS: Link State Database IS-IS Level-1 Link State Database (* - originated local) LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL 0000.0000.0100.0500 0X00000007 0XE7EA 384 0/0/0 Metric: 0 IS 0000.0000.0200.00 Metric: 0 IS 0000.0000.0100.00 A pseudonode LSP ( 0000.0000.01000.0500 ) is generated by RS1, which is the DIS on interface fe1/1. A pseudonode LSP ( 0000.0000.01000.0500 ) is generated by RS1, which is the DIS on interface fe1/1. This LSP lists all known ISs on the LAN. This LSP lists all known ISs on the LAN.

10. L1 routers install default to nearest L2 router automagically. L1 routers install default to nearest L2 router automagically. Not originated as LSP. Not originated as LSP. Default Route Installation RS1# ip show routes Destination Gateway Owner Netif ----------- ------- ----- ----- default 12.1.1.2 ISIS_L1 fe1/1 10.1.1.0/30 12.1.1.2 ISIS_L1 fe1/1 12.1.1.0/24 directly connected - fe1/1 13.1.1.1 13.1.1.1 - lo0 127.0.0.1 127.0.0.1 ARP lo0 192.168.1.0/24 directly connected - fe2/1 192.168.2.0/24 12.1.1.2 ISIS_L1 fe1/1

11. .8.2.1 10.1.1.0/30 RS1 pos3/1 RS2 12.1.1.0/24.2 fe1/1 RS4 pos3/1 fe1/1 fe2/1 192.168.1.1/24 192.168.2.1/24 192.168.4.1/24 gi2/1 Redistribution interface create ip pos3/1 address-netmask 10.1.1.1/30 port so.3.1 interface create ip fe1/1 address-netmask 12.1.1.2/24 port et.1.1 interface create ip gi2/1 address-netmask 192.168.2.1/24 port gi.2.1 interface add ip lo0 address-netmask 13.1.1.2/32 ! ip-router global set router-id 13.1.1.2 ! ospf create area 0.0.0.0 ospf add interface pos3/1 to-area 0.0.0.0 ospf start ! isis add area 49.0001 isis add interface fe1/1 isis set system-id 0000.0000.0002 isis start ! ip-router policy redistribute from-proto direct to-proto ospf ip-router policy redistribute from-proto isis-level-2 to-proto ospf ip-router policy redistribute from-proto direct to-proto isis-level-2 ip-router policy redistribute from-proto ospf-ase to-proto isis-level-2 ! system set name RS2 IS-IS Domain OSPF Domain

12. Redistribution RS2# isis show lsp-database level 2 detail id 0000.0000.0200.0000 Task ISIS: Link State Database IS-IS Level-2 Link State Database (* - originated local) LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL 0000.0000.0200.0000* 0X0000000C 0XA3C7 491 0/0/0 Area Addresses: 49.0001 NLPID: 0XCC Metric: 10 IS 0000.0000.0100.03 Metric: 10 IP 12.1.1/24 ipextreach: 192.168.4/24 default int 12 192.168.2/24 default int 0 10.1.1.2/32 default int 0

13. .8.2.1 10.1.1.0/30 RS1 pos3/1 RS2 12.1.1.0/24.2 fe1/1 RS4 pos3/1 fe1/1 fe2/1 192.168.1.1/24 192.168.2.1/24 192.168.4.1/24 gi2/1 Summarization interface create ip pos3/1 address-netmask 10.1.1.2/30 port so.3.1 interface create ip fe1/1 address-netmask 192.168.4.1/24 port et.1.1 interface add ip lo0 address-netmask 13.1.1.4/32 ! isis add area 49.0002 isis add interface pos3/1 isis add summary-orig 192.168.4.0/22 metric 20 isis set system-id 0000.0000.0004 isis start ! ip-router policy redistribute from-proto direct to-proto isis-level-2 ! system set name RS4 192.168.4.0/22

14. Summarization RS2# ip show routes Destination Gateway Owner Netif ----------- ------- ----- ----- 10.1.1.1 127.0.0.1 - lo0 10.1.1.2 10.1.1.1 - pos3/1 12.1.1.0/24 directly connected - fe1/1 13.1.1.2 13.1.1.2 - lo0 127.0.0.1 127.0.0.1 ARP lo0 192.168.1.0/24 12.1.1.8 ISIS_L1 fe1/1 192.168.2.0/24 directly connected - gi2/1 192.168.4.0/22 10.1.1.2 ISIS_L2 pos3/1 RS2# isis show lsp-database detail level 2 id 0000.0000.0400.0000 Task ISIS: Link State Database IS-IS Level-2 Link State Database (* - originated local) LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL 0000.0000.0400.0000 0X0000002D 0X419C 1016 0/0/0 Area Addresses: 49.0002 NLPID: 0XCC Metric: 10 IS 0000.0000.0200.00 Metric: 10 IP 10.1.1/30 ipextreach: 192.168.4/22 default int 20

15. Troubleshooting IS-IS Commands isis show adjacencies isis show adjacencies isis show circuits isis show circuits isis show export-policies isis show export-policies isis show globals isis show globals isis show lsp-database isis show lsp-database isis show timers isis show timers

16. Troubleshooting IS-IS Tracing Commands isis trace: isis trace: –adjacency: isis-adjacency updates –csnp: processing and construction of CSNPs –db: isis lsp database –debug: isis debugging –dis-election: isis DIS election –flooding : flooding of all LSPs –iih: send and receive of IIHs –sp: send and receive of LSPs –packets: send and receive of PACKETS –psnp: processing and construction of PSNPs –spf: running of spf algorithm –system: isis-system tracepoints

17. Troubleshooting IS-IS GateD Configuration File #****************************************************************************** # # RS IP Routing Config File # Created at: 2000-10-19 10:39:42 # #****************************************************************************** isis on { systemid 0.0.2.0 ; area 49.0001 ; interface "pos3/1" { }; interface "fe1/1" { }; export proto isis level 1 { proto direct { all ; };