Saturday, December 31, 2016

configure Intermediate System to Intermediate System (IS-IS) routing protocol on cisco routers

*** setup information

r1 ----> r2 -----> r3

area id: 30.0001
system id is changed from one another, example area id + system id: 30.0001.1000.0000.0001.00 for r1

1- configuration

*** r1 configuration
interface Loopback0
 ip address 10.0.0.1 255.255.255.255
!
interface FastEthernet0/0
 ip address 1.1.1.1 255.255.255.252
 ip router isis
 duplex auto
 speed auto
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
router isis
 net 30.0001.1000.0000.0001.00
 passive-interface Loopback0



*** r2 configuration
interface Loopback0
 ip address 10.0.0.2 255.255.255.255
!
interface FastEthernet0/0
 ip address 1.1.1.2 255.255.255.252
 ip router isis
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 1.1.2.1 255.255.255.252
 ip router isis
 duplex auto
 speed auto
!
router isis
 net 30.0001.1000.0000.0002.00
 passive-interface Loopback0



*** r3 configuration
interface Loopback0
 ip address 10.0.0.3 255.255.255.255
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 1.1.2.2 255.255.255.252
 ip router isis
 duplex auto
 speed auto
!
router isis
 net 30.0001.1000.0000.0003.00
 passive-interface Loopback0




2- result showing
- routing on router r1
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     1.0.0.0/30 is subnetted, 2 subnets
C       1.1.1.0 is directly connected, FastEthernet0/0
i L1    1.1.2.0 [115/20] via 1.1.1.2, FastEthernet0/0
     10.0.0.0/32 is subnetted, 3 subnets
i L1    10.0.0.2 [115/10] via 1.1.1.2, FastEthernet0/0
i L1    10.0.0.3 [115/20] via 1.1.1.2, FastEthernet0/0
C       10.0.0.1 is directly connected, Loopback0


- show isis neighbor on router r2
R2#show isis neighbors

System Id      Type Interface   IP Address      State Holdtime Circuit Id
R3             L1   Fa0/1       1.1.2.2         UP    8        R3.01             
R3             L2   Fa0/1       1.1.2.2         UP    8        R3.01             
R1             L1   Fa0/0       1.1.1.1         UP    28       R2.01             
R1             L2   Fa0/0       1.1.1.1         UP    22       R2.01  


R2#show clns neighbors

System Id      Interface   SNPA                State  Holdtime  Type Protocol
R3             Fa0/1       c402.4696.0001      Up     9         L1L2 IS-IS
R1             Fa0/0       c400.4696.0000      Up     28        L1L2 IS-IS


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