Thursday, 4 July 2013

IS-IS Configuring The Basics

Configuring Basic-Intergrated IS-IS



  • Configure and verify the operation of IS-IS
  • Configure NET identifying a domain, area, and intermediate system
  • Configure and verify level 1 and 2 IS-IS adjacencies
  • Verfiy and understand IS-IS topology table
  • Manipulate IS-IS adjacency timers
  • Implement IS-IS domain and link authentication

Configuring basic IS-IS 

I'm going to configure IS-IS on each router and give each Fast Ethernet interface a priority of 100.

Verify IS-IS Adjacencies and operation

The sh ip protocols command will show use that IS-IS is the running protocol;

As we are working with the OSI connectionless protocol suite we have to use the follow command to see the IS-IS protocol output;

The update timers are at 0 because the updates are not sent at regular intervals because they are event driven. To view IS-IS neighbours you can use the following command;

The IS-IS database can be viewed with the show isis database command;

You can gain further information per interface with the following command;

The topology and routing table can be viewed with the following commands;

Converting to the IS-IS backbone

I will now configure the following on all routers. To see the effect of this command you can use some show commands.

Manipulating the IS-IS Interface Timers

The default of the hello interval is 10 seconds, and the default of the hello multiplier is 3. To configure these timers enter the following commands on the routers;

Implementing IS-IS L2 Core Authentication

Authentication is set on the interfaces similar to OSPF;

We can verify that all routers are neighbours with the following command;

Implement IS-IS Domain Authentication

I am now going to configure domain authentication on all the routers.

Use the following commands to verify the configuration;


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