Below is the basic configuration of IS-IS :-
R1
configure terminal
router isis
net 49.0001.0000.0000.0001.00
is-type level-1
log-adjacency-changes
interface FastEthernet 0/0
ip router isis
interface loopback 0
ip router isis
copy running-confign startup-config
R2
configure terminal
router isis
net 49.0001.0000.0000.0002.00
is-type level-1-2
log-adjacency-changes
interface FastEthernet 0/0
ip router isis
interface loopback 0
ip address 2.2.2.2 255.255.255.0
no shutdown
ip router isis
interface FastEthernet 0/1
ip router isis
copy running-confign startup-config
R3
configure terminal
router isis
net 49.0002.0000.0000.0003.00
is-type level-2
log-adjacency-changes
interface FastEthernet 0/1
no shutdown
ip address 192.168.0.3 255.255.255.0
ip router isis
interface loopback 0
ip address 3.3.3.3 255.255.255.0
ip router isis
copy running-confign startup-config
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