Network Requirements
- Configure the IS-IS protocol to realize the network interconnection between devices.
- Device1 is the Level-1 router and Device2 is the Level-1-2 router. Device1 and Device2 are in the same area, Area 10. Device3 is the Level-2 router in Area 20. Device2 connects the two areas.
Network Topology
Figure 9–1 Networking of the IS-IS basic functions
Configuration Steps
Step 1: Configure the IP address of the interfaces. (Omitted)
Step 2: Configure the IS-IS and enable the process on the interface.
#Configure the IS-IS process as 100, area number as 10, and type as Level-1 and enable the process on the interface on Device1.
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Device1#configure terminal
Device1(config)#router isis 100
Device1(config-isis)#net 10.0000.0000.0001.00
Device1(config-isis)#is-type level-1
Device1(config-isis)#metric-style wide
Device1(config-isis)#exit
Device1(config)#interface vlan2
Device1(config-if-vlan2)#ip router isis 100
Device1(config-if-vlan2)#exit
Device1(config)#interface vlan3
Device1(config-if-vlan3)#ip router isis 100
Device1(config-if-vlan3)#exit
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#Configure the IS-IS process as 100, area number as 10, and type as Level-1-2 and enable the process on the interface on Device2.
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Device2#configure terminal
Device2(config)#router isis 100
Device2(config-isis)#net 10.0000.0000.0002.00
Device2(config-isis)#metric-style wide
Device2(config-isis)#exit
Device2(config)#interface vlan2
Device2(config-if-vlan2)#ip router isis 100
Device2(config-if-vlan2)#exit
Device2(config)#interface vlan3
Device2(config-if-vlan3)#ip router isis 100
Device2(config-if-vlan3)#exit
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#Configure the IS-IS process as 100, area number as 20, and type as Level-2 and enable the process on the interface on Device3.
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Device3#configure terminal
Device3(config)#router isis 100
Device3(config-isis)#net 20.0000.0000.0003.00
Device3(config-isis)#is-type level-2
Device3(config-isis)#metric-style wide
Device3(config-isis)#exit
Device3(config)#interface vlan2
Device3(config-if-vlan2)#ip router isis 100
Device3(config-if-vlan2)#exit
Device3(config)#interface vlan3
Device3(config-if-vlan3)#ip router isis 100
Device3(config-if-vlan3)#exit
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Step 3: Check the result.
#View the IS-IS neighboring information of Device1.
Device1#show isis neighbors
IS-IS Instance 100 Neighbors (Counter 1):
Type System ID Interface State Holdtime Level IETF-NSF Priority Circuit ID
L1-LAN 0000.0000.0002 vlan3 Up 29 sec L1 capable 64 0000.0000.0001.01
#View the IS-IS neighboring information on Device2.
Device2#show isis neighbors
IS-IS Instance 100 Neighbors (Counter 2):
Type System ID Interface State Holdtime Level IETF-NSF Priority Circuit ID
L2-LAN 0000.0000.0003 vlan2 Up 9 sec L2 capable 64 0000.0000.0003.01
L1-LAN 0000.0000.0001 vlan3 Up 8 sec L1 capable 64 0000.0000.0001.01
Device2 builds the IS-IS neighbor with Device1 and Device3, respectively.
#View the IS-IS neighboring information of Device3.
Device3#show isis neighbors
IS-IS Instance 100 Neighbors (Counter 1):
Type System ID Interface State Holdtime Level IETF-NSF Priority Circuit ID
L2-LAN 0000.0000.0002 vlan3 Up 22 sec L2 capable 64 0000.0000.0003.01
#View the routing information of Device1.
Device1#show ip route
Codes: C - connected, S - static, R - RIP, O - OSPF, OE-OSPF External, M - Management
D - Redirect, E - IRMP, EX - IRMP external, o - SNSP, B - BGP, i-IS-IS
Gateway of last resort is 100.1.1.2 to network 0.0.0.0
i 0.0.0.0/0 [115/10] via 100.1.1.2, 17:44:09, vlan3
C 10.1.1.0/24 is directly connected, 16:56:18, vlan2
C 100.1.1.0/24 is directly connected, 18:37:57, vlan3
C 127.0.0.0/8 is directly connected, 284:02:13, lo0
i 200.1.1.0/24 [115/20] via 100.1.1.2, 17:44:09, vlan3
Device1#show isis ipv4 route
IS-IS Instance 100, VRF Kernel, IPv4 routes table (Counter 4):
L1 0.0.0.0/0, flags none, metric 10, from learned, installed
via 100.1.1.2, vlan3, neighbor 0000.0000.0002
L1 10.1.1.0/24, flags none, metric 10, from network connected
via 0.0.0.0, vlan2
L1 100.1.1.0/24, flags none, metric 10, from network connected
via 0.0.0.0, vlan3
L1 200.1.1.0/24, flags none, metric 20, from learned, installed
via 100.1.1.2, vlan3, neighbor 0000.0000.0002
A default routing is in the routing table of Device1 and the next hop is Device2.
#View the routing information of Device2.
Device2#show ip route
Codes: C - connected, S - static, R - RIP, O - OSPF, OE-OSPF External, M - Management
D - Redirect, E - IRMP, EX - IRMP external, o - SNSP, B - BGP, i-IS-IS
Gateway of last resort is not set
i 10.1.1.0/24 [115/20] via 100.1.1.1, 16:58:26, vlan3
C 100.1.1.0/24 is directly connected, 18:39:58, vlan3
C 127.0.0.0/8 is directly connected, 20:16:34, lo0
C 200.1.1.0/24 is directly connected, 18:39:37, vlan2
i 210.1.1.0/24 [115/20] via 200.1.1.2, 16:57:56, vlan2
Device2#show isis ipv4 route
IS-IS Instance 100, VRF Kernel, IPv4 routes table (Counter 4):
L1 10.1.1.0/24, flags none, metric 20, from learned, installed
via 100.1.1.1, vlan3, neighbor 0000.0000.0001
L1 100.1.1.0/24, flags none, metric 10, from network connected
via 0.0.0.0, vlan3
L1 200.1.1.0/24, flags none, metric 10, from network connected
via 0.0.0.0, vlan2
L2 210.1.1.0/24, flags none, metric 20, from learned, installed
via 200.1.1.2, vlan2, neighbor 0000.0000.0003
Device2 contains the Level-1 and Level-2 routing.
#View the routing information of Device3.
Device3#show ip route
Codes: C - connected, S - static, R - RIP, O - OSPF, OE-OSPF External, M Management
D - Redirect, E - IRMP, EX - IRMP external, o - SNSP, B BGP, i-IS-IS
Gateway of last resort is not set
i 10.1.1.0/24 [115/30] via 200.1.1.1, 16:59:29, vlan2
i 100.1.1.0/24 [115/20] via 200.1.1.1, 17:47:29, vlan2
C 127.0.0.0/8 is directly connected, 945:29:12, lo0
C 200.1.1.0/24 is directly connected, 18:40:27, vlan2
C 210.1.1.0/24 is directly connected, 16:59:04, vlan3
Device3#show isis ipv4 route
IS-IS Instance 100, VRF Kernel, IPv4 routes table (Counter 4):
L2 10.1.1.0/24, flags none, metric 30, from learned, installed
via 200.1.1.1, vlan2, neighbor 0000.0000.0002
L2 100.1.1.0/24, flags none, metric 20, from learned, installed
via 200.1.1.1, vlan2, neighbor 0000.0000.0002
L2 200.1.1.0/24, flags none, metric 10, from network connected
via 0.0.0.0, vlan2
L2 210.1.1.0/24, flags none, metric 10, from network connected
via 0.0.0.0, vlan3
Device3 learns the Level-1 routing and the Level-1 leaks the routing to Level-2 by default.
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The metric type is the narrow metric by default. The wide metric is recommended.
- The IS-IS entity attribute is Level-1-2 by default.
Switch
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