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-ISI'm going to configure IS-IS on each router and give each Fast Ethernet interface a priority of 100.
Verify IS-IS Adjacencies and operationThe 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 backboneI 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 TimersThe 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 AuthenticationAuthentication is set on the interfaces similar to OSPF;
We can verify that all routers are neighbours with the following command;
Implement IS-IS Domain AuthenticationI am now going to configure domain authentication on all the routers.
Use the following commands to verify the configuration;