ISIS multiple areas on same router

 router isis
   net 49.5555.5555.5555.5555.00   
   net 49.6666.6666.6666.6666.00
   redistribute eigrp 30 metric 1
   redistribute eigrp 106 metric 1
   passive-interface Loopback1

By having both net statements, the router becomes an ISIS border router.

• net 49.5555.5555.5555.5555.00
• net 49.6666.6666.6666.6666.00