IS-IS Lab 1 Basic configuration

Download Lab: VIRL | EVE-NG | GNS3

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Image requirements:
 Cisco IOSv (vios-adventerprisek9-m.vmdk.SPA.156-2.T)

Probably IS-IS is less discussed routing protocol on the Internet compares to its counterpart OSPF but I believe just because it appears to be more difficult to understand the underlying mechanism of this link-state protocol, it should not deter anyone from using it on their networks. This lab will show you how simple it is to configure Integrated IS-IS.

Lab Tasks: 

1. The topology already configured with basic IPv4 and IPv6 addressing, before you begin, get familiar with the diagram for this lab, study topology and use the show commands to verify basic configurations. 

2. Start this lab with core router "Core1". Enter IS-IS router configuration mode without specifying any topology name.  

3. For IS-IS protocol to work, the only configuration at the global router mode necessary is NET (network entity title), this is complex command performing multiple functions, it defines IS-IS Area ID and System-ID for the router to participate in the routing process, as well other features. System-ID is like OSPF's Router-ID. NET also referred by NSAP (Network Service Access Point) which is the address of the router in the CLNS networks. This is one of the ways the NET could be represented on the Cisco IOS: 49.0011.0001.32ab.fe30.00, the Blue part of the NET represents Area-ID and the Red is for the System-ID. Now that you understand the basics of the NET you have to configure it under the IS-IS router configuration mode.  

4. Repeat steps 2 and 3 on all routers in the topology. 

5. Enable IS-IS on the interfaces according to the topology, Loopback0 interfaces have to participate in the routing process, on the ENR1 interface Loopback1 should be enabled as well. 

6. Verify basic IS-IS, neighborship, and prefixes in the routing table.

7. Save configurations.    

Nodes Access: 
Enable:       cisco 
Username:  cisco 
Password:   cisco  

Configuration example:

Core1(config)#router  isis
Core1(config-router)#net 49.A001.0000.0000.C001.00
Core1(config-router)# exit 

Core1(config)#interface g0/1
Core1(config-if)#ip router isis
Core1(config-if)#interface g0/2
Core1(config-if)#ip router isis
Core1(config-if)#interface g0/3
Core1(config-if)#ip router isis
Core1(config-if)#interface g0/4
Core1(config-if)#ip router isis

Core1(config-if)#interface lo0
Core1(config-if)#ip router isis

Verify IS-IS: 
Core1# show isis neighbors 
Core1# show ip route isis




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