Cisco CCNP and CCIE Study Notes

Consider two routers connected to each other via frame relay serial interfaces. The routers are able to ping each other but when IS-IS is configured on the routers, they fail to form neighbor adjacencies. Here is the config from the two routers

Router1

interface Serial2/0
 ip address 10.10.10.1 255.255.255.0
 ip router isis
 encapsulation frame-relay
 frame-relay map ip 10.10.10.1 102
 frame-relay interface-dlci 102
!
router isis
 net 49.0100.1111.1111.1111.00
 is-type level-1

Router2

interface Serial2/0
 ip address 10.10.10.2 255.255.255.0
 ip router isis
 encapsulation frame-relay
 frame-relay map ip 10.10.10.2 201
 frame-relay interface-dlci 201
!
router isis
 net 49.0100.2222.2222.2222.00
 is-type level-1

What needs to be done to get the two routers to see each other as IS-IS neighbors?