Default Network

To publish the default network in an EIGRP domain we have 3 methods. Lets take a look one by one

Method 1: Redistribution

On R1 Create a static default route and then redistribute it in an EIGRP domain.

R2#sh run

ip route 0.0.0.0 0.0.0.0 Ethernet1/0

!

R2#sh run

router eigrp 100

 redistribute static

 network 150.2.0.0

 network 155.1.0.0

 no auto-summary

R6#sh ip route | in D*EX

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

D*EX 0.0.0.0/0 [170/2198016] via 155.1.156.1, 00:02:39, FastEthernet0/0

BB2#traceroute 30.0.0.1

Type escape sequence to abort.

Tracing the route to 30.0.0.1

  1 155.1.42.4 72 msec 96 msec 16 msec

  2 155.1.14.1 44 msec 100 msec 40 msec

  3 155.1.123.2 48 msec 24 msec 80 msec

  4  *  *  *

Method 2: Summary Route

Lets remove the static route on R2 and redistribution also.

R2#sh run int s0/0

interface Serial0/0

 ip address 155.1.123.2 255.255.255.0

 encapsulation frame-relay

 ip summary-address eigrp 100 0.0.0.0 0.0.0.0 5

 serial restart-delay 0

end

R6#sh ip route | in D* 0.0.0.0/0

D*   0.0.0.0/0 [90/2300416] via 155.1.156.1, 00:02:48, FastEthernet0/0

BB2#traceroute 30.0.0.1

Type escape sequence to abort.

Tracing the route to 30.0.0.1

  1 155.1.42.4 96 msec 60 msec 32 msec

  2 155.1.14.1 68 msec 24 msec 60 msec

  3 155.1.123.2 20 msec 52 msec 12 msec

  4 * * *

Method 3: Default-Network

R2#sh run int lo 1

interface Loopback1

 ip address 1.0.0.1 255.0.0.0

end

!

router eigrp 100

 network 1.0.0.0

 network 150.2.0.0

 network 155.1.0.0

 no auto-summary

!

ip default-network 1.0.0.0

R6#sh ip route | in D* 1.0.0.0/8

D*   1.0.0.0/8 [90/2300416] via 155.1.156.1, 00:01:13, FastEthernet0/0

BB2#traceroute 30.0.0.1

Type escape sequence to abort.

Tracing the route to 30.0.0.1

  1 155.1.42.4 68 msec 48 msec 12 msec

  2 155.1.14.1 52 msec 36 msec 32 msec

  3 155.1.123.2 100 msec 16 msec 20 msec

  4 * * *