Studying ISIS Level 2

R1(config)#router isis

R1(config-router)#net 49.0001.0000.0000.0001.00

R1(config-router)#is-type level-2-only

R1(config-router)#exit

R1(config)#int lo0

R1(config-if)#ip add 1.1.1.1 255.255.255.0

R1(config-if)#no shut

R1(config-if)#ip router isis

R1(config-router)#exit

R1(config)#int fa0/0

R1(config-if)#ip add 10.1.13.1 255.255.255.0

R1(config-if)#no shut

R1(config-if)#ip router isis

R1(config-router)#exit

R1(config)#int fa1/0

R1(config-if)#ip add 10.1.14.1 255.255.255.0

R1(config-if)#no shut

R1(config-if)#ip router is

R1(config-if)#end

R2(config)#router isis

R2(config-router)#net 49.0002.0000.0000.0002.00

R2(config-router)#is-type level-2-only

R2(config-router)#exit

R2(config)#int lo0

R2(config-if)#ip add 2.2.2.2 255.255.255.0

R2(config-if)#no shut

R2(config-if)#ip router isis

R2(config-if)#end

R2(config)#int fa0/0

R2(config-if)#ip add 10.1.23.2 255.255.255.0

R2(config-if)#no shut

R2(config-if)#ip router isis

R2(config-if)#end

R2(config)#int fa1/0

R2(config-if)#ip add 10.1.25.2 255.255.255.0

R2(config-if)#no shut

R2(config-if)#ip router isis

R3(config)#router isis

R3(config-router)#net 49.0003.0000.0000.0003.00

R3(config-router)#router isis

R3(config-router)#is-type level-2-only

R3(config-router)#exit

R3(config)#int lo0

R3(config-if)#ip add 2.2.2.2 255.255.255.0

R3(config-if)#no shut

R3(config-if)#ip router isis

R3(config-router)#exit

R3(config)#int fa0/0

R3(config-if)#ip add 10.1.13.3 255.255.255.0

R3(config-if)#no shut

R3(config-if)#ip router isis

R3(config-router)#exit

R3(config)#int fa1/0

R3(config-if)#ip add 10.1.23.3 255.255.255.0

R3(config-if)#no shut

R3(config-if)#ip router isis

R3(config-router)#end

R4(config)#router isis

R4(config-router)#net 49.0004.0000.0000.0004.00

R4(config-router)#is-type level-2-only

R4(config-router)#exit

R4(config)#int lo0

R4(config-if)#ip add 4.4.4.4 255.255.255.0

R4(config-if)#no shut

R4(config-if)#ip router isis

R4(config-if)#exit

R4(config)#int fa0/0

R4(config-if)#ip add 10.1.14.4 255.255.255.0

R4(config-if)#no shut

R4(config-if)#ip router isis

R4(config-if)#end

R4(config)#int fa1/0

R4(config-if)#ip add 10.1.45.4 255.255.255.0

R4(config-if)#no shut

R4(config-if)#ip router isis

R4(config-if)#end

R5(config)#router isis

R5(config-router)#net 49.0005.0000.0000.0005.00

R5(config-router)#is-type level-2-only

R5(config-router)#exit

R5(config)#int lo0

R5(config-if)#ip add

R5(config-if)#ip add 5.5.5.5 255.255.255.0

R5(config-if)#no shut

R5(config-if)#ip router isis

R5(config-if)#exit

R5(config)#int fa0/0

R5(config-if)#ip add 10.1.25.5 255.255.255.0

R5(config-if)#ip router isis

R5(config-if)#exit

R5(config)#int fa1/0

R5(config-if)#ip add 10.1.45.5 255.255.255.0

R5(config-if)#no shut

R5(config-if)#ip router isis

R5(config-if)#end

R1#sho isis neighbors

System Id      Type Interface IP Address      State Holdtime Circuit Id

R4             L2   Fa1/0     10.1.14.4       UP    8        R4.02             

R3             L2   Fa0/0     10.1.13.3       UP    7        R3.01  

R2#sho isis neighbors

System Id      Type Interface IP Address      State Holdtime Circuit Id

R5             L2   Fa1/0     10.1.25.5       UP    8        R5.02             

R3             L2   Fa0/0     10.1.23.3       UP    7        R3.02        

R3#sho isis neighbors

System Id      Type Interface IP Address      State Holdtime Circuit Id

R2             L2   Fa1/0     10.1.23.2       UP    22       R3.02             

R1             L2   Fa0/0     10.1.13.1       UP    29       R3.01    

R4#sho isis neighbors

System Id      Type Interface IP Address      State Holdtime Circuit Id

R5             L2   Fa1/0     10.1.45.5       UP    8        R5.03             

R1             L2   Fa0/0     10.1.14.1       UP    20       R4.02  

R5#sho isis neighbors

System Id      Type Interface IP Address      State Holdtime Circuit Id

R4             L2   Fa1/0     10.1.45.4       UP    25       R5.03             

R2             L2   Fa0/0     10.1.25.2       UP    21       R5.02        

R1#sho ip route isis

     2.0.0.0/24 is subnetted, 1 subnets

i L2    2.2.2.0 [115/20] via 10.1.13.3, FastEthernet0/0

     4.0.0.0/24 is subnetted, 1 subnets

i L2    4.4.4.0 [115/20] via 10.1.14.4, FastEthernet1/0

     5.0.0.0/24 is subnetted, 1 subnets

i L2    5.5.5.0 [115/30] via 10.1.14.4, FastEthernet1/0

     10.0.0.0/24 is subnetted, 5 subnets

i L2    10.1.25.0 [115/30] via 10.1.14.4, FastEthernet1/0

                  [115/30] via 10.1.13.3, FastEthernet0/0

i L2    10.1.23.0 [115/20] via 10.1.13.3, FastEthernet0/0

i L2    10.1.45.0 [115/20] via 10.1.14.4, FastEthernet1/0

R1#sho isis topology

IS-IS paths to level-2 routers

System Id            Metric     Next-Hop             Interface   SNPA

R1                   --

R2                   20         R3                   Fa0/0       cc03.0485.0000

R3                   10         R3                   Fa0/0       cc03.0485.0000

R4                   10         R4                   Fa1/0       cc04.048a.0000

R5                   20         R4                   Fa1/0       cc04.048a.0000  

R1#ping 5.5.5.5

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 12/24/48 ms