hostname r1
! debug isis adj-packets
! debug isis events
! debug isis update-packets
interface eth-r2
 ip router isis 1
 isis circuit-type level-2-only
 isis network point-to-point
!
interface eth-r3
 ip router isis 1
 isis circuit-type level-2-only
 isis metric 20
 isis network point-to-point
!
router isis 1
 is-type level-2-only
 net 10.0000.0000.0000.0000.0000.0000.0000.0000.0000.00
!