【Lab Objectives】
1. To master the basic IS-IS routing protocol configuration.
2. To understand the type of L1/L2 route.
3. To master the summary configuration of IS-IS area.
【Lab Topology】
【Lab Steps】
1. Configure the router’s IP address, and use the command Ping to confirm the connect’s interoperability of each router.
2. The configuration of each router is shown as below:
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R1(config)#interface Loopback0 R1(config-if)#ip address 172.16.1.1 255.255.255.0 R1(config-if)#ip router isis cisco R1(config-if)#isis circuit-type level-1 R1(config-if)#exit R1(config)# R1(config)#interface Loopback1 R1(config-if)#ip address 172.16.2.1 255.255.255.0 R1(config-if)#ip router isis cisco R1(config-if)#isis circuit-type level-1 R1(config-if)#exit R1(config)# R1(config)#interface Serial1/1 R1(config-if)#ip address 172.16.255.1 255.255.255.252 R1(config-if)#ip router isis cisco R1(config-if)#isis circuit-type level-2-only R1(config-if)#exit R1(config)# R1(config)#router isis cisco R1(config-if)#net 49.0001.ca00.0bbc.0000.00 R1(config-if)#exit |
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R2(config)#interface Serial1/0 R2(config-if)#ip address 172.16.255.2 255.255.255.252 R2(config-if)#ip router isis cisco R2(config-if)#isis circuit-type level-2-only R2(config-if)#exit R2(config)# R2(config)#interface Serial1/1 R2(config-if)#ip address 172.16.255.5 255.255.255.252 R2(config-if)#ip router isis cisco R2(config-if)#exit R2(config)# R2(config)#router isis cisco R2(config-if)#net 49.0002.ca01.0bbc.0000.00 R2(config-if)#exit R2(config)# |
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R3(config)#interface Serial1/0 R3(config-if)#ip address 172.16.255.6 255.255.255.252 R3(config-if)#ip router isis cisco R3(config-if)#exit R3(config)# R3(config-if)#interface Serial1/1 R3(config-if)#ip address 172.16.255.9 255.255.255.252 R3(config-if)#ip router isis cisco R3(config-if)#isis circuit-type level-2-only R3(config-if)#exit R3(config)# R3(config-if)#router isis cisco R3(config-if)#net 49.0002.ca02.0bbc.0000.00 R3(config-if)#exit |
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R4(config)#interface Serial1/0 R4(config-if)#ip address 172.16.255.10 255.255.255.252 R4(config-if)#ip router isis cisco R4(config-if)#isis circuit-type level-2-only R4(config-if)#exit R4(config)# R4(config-if)#interface Serial1/1 R4(config-if)#ip address 172.16.255.13 255.255.255.252 R4(config-if)#ip router isis cisco R4(config-if)#isis circuit-type level-1 R4(config-if)#exit R4(config)# R4(config-if)#router isis cisco R4(config-if)#net 49.0003.ca03.0bbc.0000.00 R4(config)#exit |
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R5(config)#interface Loopback0 R5(config-if)#ip address 172.16.128.1 255.255.255.0 R5(config-if)#ip router isis cisco R5(config-if)#isis circuit-type level-1 R5(config-if)#exit R5(config)# R5(config-if)#interface Loopback1 R5(config-if)#ip address 172.16.129.1 255.255.255.0 R5(config-if)#ip router isis cisco R5(config-if)#exit R5(config)# R5(config-if)#interface Serial1/0 R5(config-if)#ip address 172.16.255.14 255.255.255.252 R5(config-if)#ip router isis cisco R5(config-if)#exit R5(config)# R5(config-if)#router isis cisco R5(config-if)#net 49.0003.ca04.0bbc.0000.00 R5(config-if)#is-type level-1 R5(config-if)#exit |
3. Check the neighbor table of R2, R3, R4, to observe the neighbors relationship under the multi-area environment:
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R2#show isis neighbors System Id Type Interface IP Address State Holdtime Circuit Id R3 L1L2 Se1/1 172.16.255.6 UP 29 01 R1 L2 Se1/0 172.16.255.1 UP 23 00 |
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R3#show isis neighbors System Id Type Interface IP Address State Holdtime Circuit Id R2 L1L2 Se1/0 172.16.255.5 UP 25 01 R4 L2 Se1/1 172.16.255.10 UP 27 00 R3# |
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R4#show isis neighbors System Id Type Interface IP Address State Holdtime Circuit Id R3 L2 Se1/0 172.16.255.9 UP 23 00 R5 L1 Se1/1 172.16.255.14 UP 22 00 |
4. Check the routing table of R1 and R5, and observe the difference:
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R1#show ip route
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 8 subnets, 2 masks i L2 172.16.128.0/24 [115/50] via 172.16.255.2, Serial1/1 i L2 172.16.129.0/24 [115/50] via 172.16.255.2, Serial1/1 C 172.16.255.0/30 is directly connected, Serial1/1 i L2 172.16.255.4/30 [115/20] via 172.16.255.2, Serial1/1 i L2 172.16.255.8/30 [115/30] via 172.16.255.2, Serial1/1 i L2 172.16.255.12/30 [115/40] via 172.16.255.2, Serial1/1 C 172.16.1.0/24 is directly connected, Loopback0 C 172.16.2.0/24 is directly connected, Loopback1 |
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R1#show isis database IS-IS Level-1 Link State Database: LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL R1.00-00 * 0x0000000B 0xD33B 679 1/0/0 IS-IS Level-2 Link State Database: LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL R1.00-00 * 0x0000000E 0xCC4D 736 0/0/0 R2.00-00 0x00000013 0xA297 427 0/0/0 R3.00-00 0x0000000F 0x65C8 1097 0/0/0 R4.00-00 0x00000011 0x4B41 818 0/0/0 |
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R5#show ip route
Gateway of last resort is 172.16.255.13 to network 0.0.0.0
172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks C 172.16.128.0/24 is directly connected, Loopback0 C 172.16.129.0/24 is directly connected, Loopback1 C 172.16.255.12/30 is directly connected, Serial1/0 i*L1 0.0.0.0/0 [115/10] via 172.16.255.13, Serial1/0 R5# R5#show isis database
IS-IS Level-1 Link State Database: LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL R4.00-00 0x0000000C 0x7BA1 770 1/0/0 R5.00-00 * 0x0000000D 0xF411 649 0/0/0 |
5. Use command ping to confirm route:
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R1#ping 172.16.129.1
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.129.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 220/240/264 ms |
6. In order to be able to more effectively reduce the size of the routing table, you can configure the IS-IS summary. First of all, to check the R4 routing table:
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R4#show ip route
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 8 subnets, 2 masks i L1 172.16.128.0/24 [115/20] via 172.16.255.14, Serial1/1 i L1 172.16.129.0/24 [115/20] via 172.16.255.14, Serial1/1 i L2 172.16.255.0/30 [115/30] via 172.16.255.9, Serial1/0 i L2 172.16.255.4/30 [115/20] via 172.16.255.9, Serial1/0 C 172.16.255.8/30 is directly connected, Serial1/0 C 172.16.255.12/30 is directly connected, Serial1/1 i L2 172.16.1.0/24 [115/40] via 172.16.255.9, Serial1/0 i L2 172.16.2.0/24 [115/40] via 172.16.255.9, Serial1/0 |
7. To configure address summary on R1:
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R1(config)#router isis cisco R1(config-router)#summary-address 172.16.0.0 255.255.128.0 R1(config-router)#exit R1(config)#exit |
8. Check routing table of R4 again:
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R4#show ip route
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 7 subnets, 3 masks i L1 172.16.128.0/24 [115/20] via 172.16.255.14, Serial1/1 i L1 172.16.129.0/24 [115/20] via 172.16.255.14, Serial1/1 i L2 172.16.255.0/30 [115/30] via 172.16.255.9, Serial1/0 i L2 172.16.255.4/30 [115/20] via 172.16.255.9, Serial1/0 C 172.16.255.8/30 is directly connected, Serial1/0 C 172.16.255.12/30 is directly connected, Serial1/1 i L2 172.16.0.0/17 [115/40] via 172.16.255.9, Serial1/0 |
9. To confirm the validity of routing summary:
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R4#ping 172.16.1.1
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 192/225/240 ms |
10. Lab completed.
Hope to helpful for you!
