Basic IS-IS Configuration Example
- Tracy Yang
Network Requirement
As shown in Figure 1, we have four switches. Switch 1 and Switch 2 are in area 12, Switch 3 and Switch 4 in area 34. Switch1 and Switch 4 are intra-area switches so they will be configured as level-1 switches. Switch 2 and Switch 3 form the backbone, so these switches will be configured as level-1-2 switches.
 Figure 1. Basic IS-IS Configuration Example
Procedure
This section describes the steps of how to configure basic IS-IS functions on Switch 1, Switch 2, Switch 3 and Switch 4.
Switch 1
Step1Â Â Â Â Â Â Â Â Â Configure the VLANs and VLAN interfaces.
admin@Switch1# set vlans vlan-id 10 l3-interface vlan10
admin@Switch1# set interface gigabit-ethernet te-1/1/2 family ethernet-switching native-vlan-id 10
admin@Switch1# set l3-interface vlan-interface vlan10 address 192.168.0.5 prefix-length 24Step2Â Â Â Â Â Â Â Â Configure IS-IS basic function.
admin@Switch1# set protocols isis area-tag instance1 network-entity 12.0000.0000.0001.00
admin@Switch1# set protocols isis area-tag instance1 is-type level-1
admin@Switch1# set protocols isis area-tag instance1 interface vlan10 ipv4-routingStep3Â Â Â Â Â Â Â Â Enable IP routing.
admin@Switch1# set ip routing enable trueStep4Â Â Â Â Â Commit the configurations.
Switch 2
Step1Â Â Â Â Â Â Â Â Â Configure the VLANs and VLAN interfaces.
Step2Â Â Â Â Â Â Â Â Configure IS-IS basic function.
Step3Â Â Â Â Â Â Â Â Enable IP routing.
Step4Â Â Â Â Â Commit the configurations.
Switch 3
Step1Â Â Â Â Â Â Â Â Â Configure the VLANs and VLAN interfaces.
Step2Â Â Â Â Â Â Â Â Configure IS-IS basic function.
Step3Â Â Â Â Â Â Â Â Enable IP routing.
Step4Â Â Â Â Â Commit the configurations.
Switch 4
Step1Â Â Â Â Â Â Â Â Â Configure the VLANs and VLAN interfaces.
Step2Â Â Â Â Â Â Â Â Configure IS-IS basic function.
Step3Â Â Â Â Â Â Â Â Enable IP routing.
Step4Â Â Â Â Â Commit the configurations.
Verify the Configuration
View the Link State Database (LSDB) information of IS-IS. Take Switch 1 and Switch 2 as an example. From the result, it can be seen that there are Level-1 and Level-2 Link-State databases on Switch 2.
Display IS-IS routing information on switches. Take Switch 2 as an example.
Copyright © 2024 Pica8 Inc. All Rights Reserved.