IS-IS over Frame-Relay configurations

Below are three common IS-IS over Frame-Relay configurations.  The first is a multipoint interface to a multipoint interface.  The second is a point-to-point interface to a point-to-point interface.  The third is a point-to-point interface to a multipoint interface utilizing the "isis network point-to-point" command.

<FIRST>
Rack2R1#sho run int s0/0.1
Building configuration...

Current configuration : 175 bytes
!
interface Serial0/0.1 multipoint
 ip address 10.12.12.1 255.255.255.0
 ip router isis
 frame-relay map clns 102 broadcast
 frame-relay map ip 10.12.12.2 102 broadcast end

Rack2R1#

Rack2R2#sho run int s0/0
Building configuration...

Current configuration : 217 bytes
!
interface Serial0/0
 ip address 10.12.12.2 255.255.255.0
 ip router isis
 encapsulation frame-relay
 frame-relay map clns 201 broadcast
 frame-relay map ip 10.12.12.1 201 broadcast  no frame-relay inverse-arp end

Rack2R2#
</FIRST>

<SECOND>
Rack2R1#sho run int serial0/0.2
Building configuration...

Current configuration : 133 bytes
!
interface Serial0/0.2 point-to-point
 ip address 10.13.13.1 255.255.255.0
 ip router isis
 frame-relay interface-dlci 103  
end

Rack2R1#

Rack2R3#sho run int s1/0.1
Building configuration...

Current configuration : 133 bytes
!
interface Serial1/0.1 point-to-point
 ip address 10.13.13.3 255.255.255.0
 ip router isis
 frame-relay interface-dlci 301  
end

Rack2R3#
</SECOND>

<THIRD>
Rack2R1#sho run int serial0/0.3
Building configuration...

Current configuration : 133 bytes
!
interface Serial0/0.3 point-to-point
 ip address 10.14.14.1 255.255.255.0
 ip router isis
 frame-relay interface-dlci 104  
end

Rack2R4#sho run int s0/0.1
Building configuration...

Current configuration : 228 bytes
!
interface Serial0/0.1 multipoint
 ip address 10.14.14.4 255.255.255.0
 ip router isis
 isis network point-to-point
 frame-relay map clns 401 broadcast
 frame-relay map ip 10.14.14.1 401 broadcast end

Rack2R4#
</THIRD>

Here is the output of R1's routing table showing the loopback interfaces of the other routers (R2, R3, and R4) learned across the Frame Relay network via IS-IS.

Rack2R1#sho ip rout isis      
     150.2.0.0/32 is subnetted, 4 subnets
i L1    150.2.4.4 [115/10] via 10.14.14.4, Serial0/0.3
i L1    150.2.3.3 [115/10] via 10.13.13.3, Serial0/0.2
i L1    150.2.2.2 [115/10] via 10.12.12.2, Serial0/0.1
Rack2R1#