IS-IS Default Route Injection to Level 1 Routers

Configuration

R1

interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
 ip address 192.168.13.1 255.255.255.0
 ip router isis
 duplex auto
 speed auto
 isis circuit-type level-2-only
!
interface FastEthernet0/1
 ip address 192.168.14.1 255.255.255.0
 ip router isis
 duplex auto
 speed auto
!
interface FastEthernet1/0
 ip address 192.168.15.1 255.255.255.0
 ip router isis
 duplex auto
 speed auto
 isis circuit-type level-1
!
router isis
 net 49.0123.0000.0000.0001.00
 metric-style wide transition
 passive-interface Loopback0

R2

interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
 ip address 192.168.23.2 255.255.255.0
 ip router isis
 duplex auto
 speed auto
 isis circuit-type level-2-only
!
interface FastEthernet0/1
 ip address 192.168.26.2 255.255.255.0
 ip router isis
 duplex auto
 speed auto
 isis circuit-type level-1
!
router isis
 net 49.0123.0000.0000.0002.00
 metric-style wide transition
 passive-interface Loopback0

R3

interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
 ip address 192.168.13.3 255.255.255.0
 ip router isis
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 192.168.23.3 255.255.255.0
 ip router isis
 duplex auto
 speed auto
!
router isis
 net 49.0123.0000.0000.0003.00
 is-type level-2-only
 metric-style wide transition
 passive-interface Loopback0

R4

interface Loopback0
 ip address 4.4.4.4 255.255.255.255
!
interface FastEthernet0/0
 ip address 192.168.14.4 255.255.255.0
 ip router isis
 duplex auto
 speed auto
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
router isis
 net 49.0004.0000.0000.0004.00
 is-type level-2-only
 metric-style wide
 passive-interface Loopback0

R5

interface Loopback0
 ip address 5.5.5.5 255.255.255.255
!
interface FastEthernet0/0
 ip address 192.168.15.5 255.255.255.0
 ip router isis
 speed 100
 full-duplex
!
interface FastEthernet0/1
 ip address 192.168.56.5 255.255.255.0
 ip router isis
 duplex auto
 speed auto
!
router isis
 net 49.0123.0000.0000.0005.00
 is-type level-1
 metric-style wide
 passive-interface Loopback0

R6

interface Loopback0
 ip address 6.6.6.6 255.255.255.255
!
interface FastEthernet0/0
 ip address 192.168.26.6 255.255.255.0
 ip router isis
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 192.168.56.6 255.255.255.0
 ip router isis
 duplex auto
 speed auto
!
router isis
 net 49.0123.0000.0000.0006.00
 is-type level-1
 metric-style wide
 passive-interface Loopback0

Verification

R4#show ip route isis
     1.0.0.0/32 is subnetted, 1 subnets
i L2    1.1.1.1 [115/10] via 192.168.14.1, FastEthernet0/0
i L2 192.168.13.0/24 [115/20] via 192.168.14.1, FastEthernet0/0
     2.0.0.0/32 is subnetted, 1 subnets
i L2    2.2.2.2 [115/30] via 192.168.14.1, FastEthernet0/0
     3.0.0.0/32 is subnetted, 1 subnets
i L2    3.3.3.3 [115/20] via 192.168.14.1, FastEthernet0/0
i L2 192.168.15.0/24 [115/20] via 192.168.14.1, FastEthernet0/0
     5.0.0.0/32 is subnetted, 1 subnets
i L2    5.5.5.5 [115/20] via 192.168.14.1, FastEthernet0/0
     6.0.0.0/32 is subnetted, 1 subnets
i L2    6.6.6.6 [115/30] via 192.168.14.1, FastEthernet0/0
i L2 192.168.26.0/24 [115/40] via 192.168.14.1, FastEthernet0/0
i L2 192.168.56.0/24 [115/30] via 192.168.14.1, FastEthernet0/0
i L2 192.168.23.0/24 [115/30] via 192.168.14.1, FastEthernet0/0

R5#show ip route isis
     1.0.0.0/32 is subnetted, 1 subnets
i L1    1.1.1.1 [115/10] via 192.168.15.1, FastEthernet0/0
     2.0.0.0/32 is subnetted, 1 subnets
i L1    2.2.2.2 [115/20] via 192.168.56.6, FastEthernet0/1
i L1 192.168.14.0/24 [115/20] via 192.168.15.1, FastEthernet0/0
     6.0.0.0/32 is subnetted, 1 subnets
i L1    6.6.6.6 [115/10] via 192.168.56.6, FastEthernet0/1
i L1 192.168.26.0/24 [115/20] via 192.168.56.6, FastEthernet0/1
i*L1 0.0.0.0/0 [115/10] via 192.168.15.1, FastEthernet0/0

R6#show ip route isis
     1.0.0.0/32 is subnetted, 1 subnets
i L1    1.1.1.1 [115/20] via 192.168.56.5, FastEthernet0/1
     2.0.0.0/32 is subnetted, 1 subnets
i L1    2.2.2.2 [115/10] via 192.168.26.2, FastEthernet0/0
i L1 192.168.14.0/24 [115/30] via 192.168.56.5, FastEthernet0/1
i L1 192.168.15.0/24 [115/20] via 192.168.56.5, FastEthernet0/1
     5.0.0.0/32 is subnetted, 1 subnets
i L1    5.5.5.5 [115/10] via 192.168.56.5, FastEthernet0/1
i*L1 0.0.0.0/0 [115/10] via 192.168.26.2, FastEthernet0/0

R5#ping 4.4.4.4 source loopback 0
!!!!!

R6#ping 4.4.4.4 source loopback 0
!!!!!

GNS File : http://www.4shared.com/rar/kneAEXKL/isis_default-route_injection.html