hostname r2
router isis
net 49.0001.0000.0000.0002.00
int e0
ip router isis
isis circuit-type level-2-only
int s0
ip router isis
isis circuit-type level-1
isis metric 35 level-1
int s1
ip router isis
isis circuit-type leyel-1
isis metric 35 level-1
router isis
net 49.0001.0000.0002.00
int e0
ip router isis
isis circuit-type level-2-only