default route of eigrp

[anitachoi3]

Hi,

How do I config eigrp to advertise the "default route" to nei? any sample config?

rdgs

[vishwancc]

Hi,

Use the network command to pass the default route to neighbor.

eg.

router eigrp 110

network 0.0.0.0

Chao

Vishwa

[anitachoi3]

Hi,

can I use below config?

R1

router eigrp 110

redistribute static

ip route 0.0.0.0 0.0.0.0 192.168.0.1

any dis-adv?

rdgs

[Giuseppe Larosa]

Hello Anita,

another way to propagate a default route in EIGRP is to use the ip default-network command

router eigrp 1

network 192.168.10.0

network 172.16.0.0

!

ip default-network 192.168.10.0

the requirements are:

the network in the default-network has to be in another major network (Class A,B, C)

a network command for it has to be present in the EIGRP process.

In this case the network propagated is that of the default-network with an EIGRP flag that signals the capability to be network of last resort.

It works also if the network is reached via a static route not only if it is a connected subnet.

This command is also supported by RIP but not by link state protocols

note: the router advertising the default route needs to have its own default static route to be able to route to gateway of last resort.

Hope to help

Giuseppe

[anitachoi3]

Hi Giuseppe,

I config R1 with

R1

router eigrp 1

network 192.168.10.0

network 172.16.0.0

!

ip default-network 192.168.10.0

and

R2

interface fe0/0

ip address 192.168.10.1 255.255.255.0

!

router eigrp 1

network 192.168.10.0 255.255.255.0

!

ip route 0.0.0.0 0.0.0.0 210.12.1.1

Is it correct?

rdgs

[Giuseppe Larosa · Accepted solution]

Hello Anita,

on R1 you need also

ip route 0.0.0.0 0.0.0.0 192.168.10.1

R1 can advertise net 192.168.10.0/24 with an externa flag to a third router in net 172.16.0.0/16 via EIGRP

R2 should be out of EIGRP domain

the context is :

R3 -------- R1 --- default network -- GW=R2

<--EIGRP---->

Hope to help

Giuseppe