Friday, 18 January 2019

Default route EIGRP, RIP, and OSPF.

Default route
we already discuss advertising default route in IP ROUTING . in this section we see configuration of default route in EIGRP, RIP, and OSPF.

lets the configuration:-

Topology:

GOAL:


  • Configure the topology as per our diagram. 
  • assign IP address as per the topology.
  • we have two methods of advertising default route 
  1. default-network ****
  2. redistribution static
  • in this scenario we use redistribution method 
  • configure static route on router 1 toward router 



R1#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol
FastEthernet0/0        10.1.1.1        YES manual up                    up
Serial3/0                   1.1.1.1         YES manual up                    up
Loopback0              11.0.0.1        YES manual up                    up
Loopback1              11.0.1.1        YES manual up                    up
Loopback2              11.0.2.1        YES manual up                    up
Loopback3              11.0.3.1        YES manual up                    up
Loopback4              11.0.4.1        YES manual up                    up

R2#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol
FastEthernet0/0        20.1.1.1        YES manual up                    up
Serial3/0                    1.1.1.2         YES manual up                    up
Serial3/1                    2.2.2.1         YES manual up                    up
Serial3/2                    3.3.3.1         YES manual up                    up



R3#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol
FastEthernet0/0        30.1.1.1        YES manual up                    up
Serial3/1                    2.2.2.2         YES manual up                    up


R4#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol
FastEthernet0/0        40.1.1.1        YES manual up                    up
Serial3/2                     3.3.3.2         YES manual up                    up


R1(config)#ip route 2.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 3.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 20.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 30.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 40.0.0.0 255.0.0.0 1.1.1.2

R2(config)#router eigrp 111
R2(config-router)#network 2.0.0.0

*Jan 18 14:26:59.043: %DUAL-5-NBRCHANGE: EIGRP-IPv4 111: Neighbor 2.2.2.2 (Serial3/1) is up: new adjacency
R2(config-router)#network 3.0.0.0

*Jan 18 14:27:03.347: %DUAL-5-NBRCHANGE: EIGRP-IPv4 111: Neighbor 3.3.3.2 (Serial3/2) is up: new adjacency

R2(config-router)#network 20.0.0.0
R2(config-router)#redistribute static
R2(config-router)#exit

R2(config)#ip route 0.0.0.0 0.0.0.0 1.1.1.1


R3(config)#router eigrp 111
R3(config-router)#network 2.0.0.0
R3(config-router)#network 30.0.0.0
R3(config-router)#exit

*Jan 18 14:06:12.027: %DUAL-5-NBRCHANGE: EIGRP-IPv4 111: Neighbor 2.2.2.1 (Serial3/1) is up: new adjacency

R4(config)#router eigrp 111
R4(config-router)#network 3.0.0.0
R4(config-router)#network 40.0.0.0

*Jan 18 14:06:46.355: %DUAL-5-NBRCHANGE: EIGRP-IPv4 111: Neighbor 3.3.3.1 (Serial3/2) is up: new adjacency

R4#show ip route eigrp
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 3.3.3.1 to network 0.0.0.0

D*EX  0.0.0.0/0 [170/2681856] via 3.3.3.1, 00:01:47, Serial3/2
D     2.0.0.0/8 [90/2681856] via 3.3.3.1, 00:02:46, Serial3/2
D     20.0.0.0/8 [90/2172416] via 3.3.3.1, 00:02:42, Serial3/2
D     30.0.0.0/8 [90/2684416] via 3.3.3.1, 00:02:46, Serial3/2

R4#ping 11.0.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/60/76 ms
R4#ping 11.0.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/56/116 ms
R4#ping 11.0.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 44/64/76 ms
R4#ping 11.0.4.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.4.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 48/56/80 ms

R3#show ip route eigrp
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 2.2.2.1 to network 0.0.0.0

D*EX  0.0.0.0/0 [170/2681856] via 2.2.2.1, 00:02:47, Serial3/1
D     3.0.0.0/8 [90/2681856] via 2.2.2.1, 00:03:46, Serial3/1
D     20.0.0.0/8 [90/2172416] via 2.2.2.1, 00:03:42, Serial3/1
D     40.0.0.0/8 [90/2684416] via 2.2.2.1, 00:03:46, Serial3/1

R3#ping 11.0.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/49/76 ms
R3#ping 11.0.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/35/40 ms
R3#ping 11.0.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/45/60 ms
R3#ping 11.0.4.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.4.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/40/52 ms

R2#show ip route
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 1.1.1.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 1.1.1.1
      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.0.0.0/8 is directly connected, Serial3/0
L        1.1.1.2/32 is directly connected, Serial3/0
      2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        2.0.0.0/8 is directly connected, Serial3/1
L        2.2.2.1/32 is directly connected, Serial3/1
      3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        3.0.0.0/8 is directly connected, Serial3/2
L        3.3.3.1/32 is directly connected, Serial3/2
      20.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        20.0.0.0/8 is directly connected, FastEthernet0/0
L        20.1.1.1/32 is directly connected, FastEthernet0/0
D     30.0.0.0/8 [90/2172416] via 2.2.2.2, 00:05:00, Serial3/1
D     40.0.0.0/8 [90/2172416] via 3.3.3.2, 00:04:56, Serial3/2

R2#ping 11.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/43/72 ms
R2#ping 11.0.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/36/52 ms
R2#ping 11.0.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/24/32 ms

R1#show ip route
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.0.0.0/8 is directly connected, Serial3/0
L        1.1.1.1/32 is directly connected, Serial3/0
S     2.0.0.0/8 [1/0] via 1.1.1.2
S     3.0.0.0/8 [1/0] via 1.1.1.2
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.0.0.0/8 is directly connected, FastEthernet0/0
L        10.1.1.1/32 is directly connected, FastEthernet0/0
      11.0.0.0/8 is variably subnetted, 10 subnets, 2 masks
C        11.0.0.0/24 is directly connected, Loopback0
L        11.0.0.1/32 is directly connected, Loopback0
C        11.0.1.0/24 is directly connected, Loopback1
L        11.0.1.1/32 is directly connected, Loopback1
C        11.0.2.0/24 is directly connected, Loopback2
L        11.0.2.1/32 is directly connected, Loopback2
C        11.0.3.0/24 is directly connected, Loopback3
L        11.0.3.1/32 is directly connected, Loopback3
C        11.0.4.0/24 is directly connected, Loopback4
L        11.0.4.1/32 is directly connected, Loopback4
S     20.0.0.0/8 [1/0] via 1.1.1.2
S     30.0.0.0/8 [1/0] via 1.1.1.2
S     40.0.0.0/8 [1/0] via 1.1.1.2

R1#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/34/40 ms
R1#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/51/80 ms
R1#ping 40.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/63/76 ms

lets see the configuration of  default route in RIPv2 but in this section we will see different method by using command.

Topology:





























GOAL:
  • delete the previous topology by using no ip routing command.
  • advertise default route by using command not by redistribution just like previous scenario.
R1(config)#no ip routing
R1(config)#ip routing

R2(config)#no ip routing
R2(config)#ip routing

R3(config)#no ip routing
R3(config)#ip routing

R4(config)#no ip routing
R4(config)#ip routing



R1(config)#ip route 2.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 3.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 20.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 30.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 40.0.0.0 255.0.0.0 1.1.1.2

R2(config)#router rip
R2(config-router)#ver 2
R2(config-router)#network 2.0.0.0
R2(config-router)#network 3.0.0.0
R2(config-router)#network 20.0.0.0
R2(config-router)#exit

R3(config)#router rip
R3(config-router)#ver 2
R3(config-router)#network 2.0.0.0
R3(config-router)#network 30.0.0.0
R3(config-router)#exit

R4(config)#router rip
R4(config-router)#ver 2
R4(config-router)#network 3.0.0.0
R4(config-router)#network 40.0.0.0
R4(config-router)#exit

R2(config)#ip route 0.0.0.0 0.0.0.0 1.1.1.1

R2(config)#router rip
R2(config-router)#version 2
R2(config-router)#default-information originate
R2(config-router)#end

R4#sh ip route rip
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 3.3.3.1 to network 0.0.0.0

R*    0.0.0.0/0 [120/1] via 3.3.3.1, 00:00:10, Serial3/2
R     2.0.0.0/8 [120/1] via 3.3.3.1, 00:00:10, Serial3/2
R     20.0.0.0/8 [120/1] via 3.3.3.1, 00:00:10, Serial3/2
R     30.0.0.0/8 [120/2] via 3.3.3.1, 00:00:10, Serial3/2
R4#ping 11.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/66/96 ms
R4#ping 11.0.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/45/52 ms
R4#ping 11.0.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/56/68 ms

R3#show ip route rip
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 2.2.2.1 to network 0.0.0.0

R*    0.0.0.0/0 [120/1] via 2.2.2.1, 00:00:17, Serial3/1
R     3.0.0.0/8 [120/1] via 2.2.2.1, 00:00:17, Serial3/1
R     20.0.0.0/8 [120/1] via 2.2.2.1, 00:00:17, Serial3/1
R     40.0.0.0/8 [120/2] via 2.2.2.1, 00:00:17, Serial3/1
R3#ping 11.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/50/80 ms
R3#ping 11.0.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 60/68/76 ms
R3#ping 11.0.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/43/60 ms

R2#show ip route
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 1.1.1.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 1.1.1.1
      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.0.0.0/8 is directly connected, Serial3/0
L        1.1.1.2/32 is directly connected, Serial3/0
      2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        2.0.0.0/8 is directly connected, Serial3/1
L        2.2.2.1/32 is directly connected, Serial3/1
      3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        3.0.0.0/8 is directly connected, Serial3/2
L        3.3.3.1/32 is directly connected, Serial3/2
      20.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        20.0.0.0/8 is directly connected, FastEthernet0/0
L        20.1.1.1/32 is directly connected, FastEthernet0/0
R     30.0.0.0/8 [120/1] via 2.2.2.2, 00:00:22, Serial3/1
R     40.0.0.0/8 [120/1] via 3.3.3.2, 00:00:14, Serial3/2

R2#show ip route
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 1.1.1.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 1.1.1.1
      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.0.0.0/8 is directly connected, Serial3/0
L        1.1.1.2/32 is directly connected, Serial3/0
      2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        2.0.0.0/8 is directly connected, Serial3/1
L        2.2.2.1/32 is directly connected, Serial3/1
      3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        3.0.0.0/8 is directly connected, Serial3/2
L        3.3.3.1/32 is directly connected, Serial3/2
      20.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        20.0.0.0/8 is directly connected, FastEthernet0/0
L        20.1.1.1/32 is directly connected, FastEthernet0/0
R     30.0.0.0/8 [120/1] via 2.2.2.2, 00:00:22, Serial3/1
R     40.0.0.0/8 [120/1] via 3.3.3.2, 00:00:14, Serial3/2
R2#
R2#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/28/40 ms
R2#ping 40.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/20/36 ms
R2#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/44/56 ms
R2#ping 11.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/22/44 ms

R1#sh ip route
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.0.0.0/8 is directly connected, Serial3/0
L        1.1.1.1/32 is directly connected, Serial3/0
S     2.0.0.0/8 [1/0] via 1.1.1.2
S     3.0.0.0/8 [1/0] via 1.1.1.2
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.0.0.0/8 is directly connected, FastEthernet0/0
L        10.1.1.1/32 is directly connected, FastEthernet0/0
      11.0.0.0/8 is variably subnetted, 10 subnets, 2 masks
C        11.0.0.0/24 is directly connected, Loopback0
L        11.0.0.1/32 is directly connected, Loopback0
C        11.0.1.0/24 is directly connected, Loopback1
L        11.0.1.1/32 is directly connected, Loopback1
C        11.0.2.0/24 is directly connected, Loopback2
L        11.0.2.1/32 is directly connected, Loopback2
C        11.0.3.0/24 is directly connected, Loopback3
L        11.0.3.1/32 is directly connected, Loopback3
C        11.0.4.0/24 is directly connected, Loopback4
L        11.0.4.1/32 is directly connected, Loopback4
S     20.0.0.0/8 [1/0] via 1.1.1.2
S     30.0.0.0/8 [1/0] via 1.1.1.2
S     40.0.0.0/8 [1/0] via 1.1.1.2
R1#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/28/52 ms
R1#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 64/88/136 ms
R1#ping 40.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/44/72 ms



 lets move on OSPF default route .

Topology;


GOAL:
  • Delete previous configuration by using no ip routing .
  • make sure router 2, 3, and 4 able to reach router 4 internet route using default route.
R1(config)#no ip routing
R1(config)#ip routing

R2(config)#no ip routing
R2(config)#ip routing

R3(config)#no ip routing
R3(config)#ip routing

R4(config)#no ip routing
R4(config)#ip routing


R4(config)#no ip routing
R4(config)#ip routing

R1(config)#ip route 20.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 30.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 40.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 2.0.0.0 255.0.0.0 1.1.1.2
R1(config)#ip route 3.0.0.0 255.0.0.0 1.1.1.2
R1(config)#end

R2(config)#router ospf 10
R2(config-router)#network 2.0.0.0 0.255.255.255 area 0
R2(config-router)#network 3.0.0.0 0.255.255.255 area 0
R2(config-router)#network 20.0.0.0 0.255.255.255 area 0
R2(config-router)#exit

R3(config)#router ospf 10
R3(config-router)#network 2.0.0.0 0.255.255.255 area 0

*Jan 18 15:30:24.795: %OSPF-5-ADJCHG: Process 10, Nbr 20.1.1.1 on Serial3/1 from LOADING to FULL, Loading Done

R3(config-router)#network 30.0.0.0 0.255.255.255 area 0
R3(config-router)#exit

R4(config)#router ospf 10
R4(config-router)#network 3.0.0.0 0.255.255.255 area 0
R4(config-router)#network 3.0.0.0 0.255.255.255 area 0

*Jan 18 15:31:25.871: %OSPF-5-ADJCHG: Process 10, Nbr 20.1.1.1 on Serial3/2 from LOADING to FULL, Loading Done

R4(config-router)#network 40.0.0.0 0.255.255.255 area 0
R4(config-router)#exit

R2(config)#ip route 0.0.0.0 0.0.0.0 1.1.1.1

R2(config)#router ospf 10
R2(config-router)#default-information originate always
R2(config-router)#end

R1#show ip route
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.0.0.0/8 is directly connected, Serial3/0
L        1.1.1.1/32 is directly connected, Serial3/0
S     2.0.0.0/8 [1/0] via 1.1.1.2
S     3.0.0.0/8 [1/0] via 1.1.1.2
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.0.0.0/8 is directly connected, FastEthernet0/0
L        10.1.1.1/32 is directly connected, FastEthernet0/0
      11.0.0.0/8 is variably subnetted, 10 subnets, 2 masks
C        11.0.0.0/24 is directly connected, Loopback0
L        11.0.0.1/32 is directly connected, Loopback0
C        11.0.1.0/24 is directly connected, Loopback1
L        11.0.1.1/32 is directly connected, Loopback1
C        11.0.2.0/24 is directly connected, Loopback2
L        11.0.2.1/32 is directly connected, Loopback2
C        11.0.3.0/24 is directly connected, Loopback3
L        11.0.3.1/32 is directly connected, Loopback3
C        11.0.4.0/24 is directly connected, Loopback4
L        11.0.4.1/32 is directly connected, Loopback4
S     20.0.0.0/8 [1/0] via 1.1.1.2
S     30.0.0.0/8 [1/0] via 1.1.1.2
S     40.0.0.0/8 [1/0] via 1.1.1.2

R1#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/53/80 ms
R1#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/52/84 ms
R1#ping 40.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/76/100 ms


R2#show ip route
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 1.1.1.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 1.1.1.1
      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.0.0.0/8 is directly connected, Serial3/0
L        1.1.1.2/32 is directly connected, Serial3/0
      2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        2.0.0.0/8 is directly connected, Serial3/1
L        2.2.2.1/32 is directly connected, Serial3/1
      3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        3.0.0.0/8 is directly connected, Serial3/2
L        3.3.3.1/32 is directly connected, Serial3/2
      20.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        20.0.0.0/8 is directly connected, FastEthernet0/0
L        20.1.1.1/32 is directly connected, FastEthernet0/0
O     30.0.0.0/8 [110/65] via 2.2.2.2, 00:03:26, Serial3/1
O     40.0.0.0/8 [110/65] via 3.3.3.2, 00:02:25, Serial3/2
R2#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/44/60 ms
R2#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
R2#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/31/52 ms
R2#ping 40.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/32/48 ms
R2#ping 11.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/23/36 ms

R3#show ip route ospf
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 2.2.2.1 to network 0.0.0.0

O*E2  0.0.0.0/0 [110/1] via 2.2.2.1, 00:02:08, Serial3/1
O     3.0.0.0/8 [110/128] via 2.2.2.1, 00:04:30, Serial3/1
O     20.0.0.0/8 [110/65] via 2.2.2.1, 00:04:30, Serial3/1
O     40.0.0.0/8 [110/129] via 2.2.2.1, 00:03:19, Serial3/1
R3#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 100/113/136 ms
R3#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/23/48 ms
R3#ping 40.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 44/58/72 ms
R3#ping 11.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 11.0.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/52/72 ms
R3#traceroute 11.0.0.1
Type escape sequence to abort.
Tracing the route to 11.0.0.1
VRF info: (vrf in name/id, vrf out name/id)
  1 2.2.2.1 20 msec 28 msec 36 msec
  2 1.1.1.1 68 msec 76 msec 48 msec

(if you have any suggestion or any query please comment) 

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