Re: EIGRP / default-information allowed out

From: Narbik Kocharians (narbikk@gmail.com)
Date: Tue Sep 16 2008 - 22:37:24 ART

Mohamed,

There are few ways to inject default route into an Eigrp routing domain,
here are some of the ways:

1. *ip route 0.0.0.0 0.0.0.0 null0*

    *Router eigrp 100*

      *Network 0.0.0.0*

*In this case the default route will show as an internal Eigrp route.*

2. *Ip route 0.0.0.0 0.0.0.0 null0*

    *Router eigrp 100* * *

      *Redistribute static*

*In this case the default route will show as an external Eigrp route "EX".*

 3. under a given interface:

    *Ip summary-address eigrp 100 0.0.0.0 0.0.0.0*

* In this case the default route will show as an internal Eigrp route.*

4. *IP default-network 1.0.0.0* (The network can be any network, but must be
a classful network and NOT a subnet, a loopback interface or any interface)*
     *

    *Router eigrp 100*

* Network 1.0.0.0*

Let's say the neighboring router is configured with option number 4, your
local router's routing table will show network 1.0.0.0 as a candidate
default as follows:

D* 1.0.0.0/8

Note the "*" after the letter D.

Now let's say your router need to have access to network 1.0.0.0, but it
does not want to use it as a candidate default, in this case your router
(R1) should be configured as follows:

*Router eigrp 100*

* No default-information allowed in *

After the above configuration, if you check your routing table it should
look like the following:

D 1.0.0.0/8

Note the "*" is gone and network 1.0.0.0 is no longer used as the candidate
default.

On Tue, Sep 16, 2008 at 5:35 PM, Igor M. <imanassypov@rogers.com> wrote:

> Gateways of last resort selected using the ip default-network
> command are propagated differently depending on which routing protocol
> is propagating the default route. For IGRP and EIGRP to propagate the
> route, the network specified by the ip default-network command
> must be known to IGRP or EIGRP. This means the network must be an IGRP-
> or EIGRP-derived network in the routing table, or the static route used
> to generate the route to the network must be redistributed into IGRP or
> EIGRP, or advertised into these protocols using the network command.
>
> ----------------------
>
> I.M., M.Eng. P.Eng.
>
> Network Architect
>
> CI Investments
>
> ----------------------
>
> --- On Wed, 9/17/08, Mohamed El Henawy <m.henawy@link.net> wrote:
> From: Mohamed El Henawy <m.henawy@link.net>
> Subject: Re: EIGRP / default-information allowed out
> To: "Igor M." <imanassypov@rogers.com>, ccielab@groupstudy.com
> Received: Wednesday, September 17, 2008, 6:21 PM
>
> i think this one is on OSPF only
>
>
>
>
> R5(config-router)#default-information ?
> allowed Allow default information
> in Accept default routing information
> out Output default routing information
>
>
> Mohamed
>
> ----- Original Message -----
> From: Igor M.
> To: ccielab@groupstudy.com ; Mohamed El Henawy
> Sent: Tuesday, September 16, 2008 11:37 PM
> Subject: Re: EIGRP / default-information allowed out
>
>
> you need 'default-information originate' under your eigrp process
>
> ----------------------
> I.M., M.Eng. P.Eng.
> Network Architect
> CI Investments
> ----------------------
>
> --- On Wed, 9/17/08, Mohamed El Henawy <m.henawy@link.net> wrote:
>
> From: Mohamed El Henawy <m.henawy@link.net>
> Subject: EIGRP / default-information allowed out
> To: ccielab@groupstudy.com
> Received: Wednesday, September 17, 2008, 5:02 PM
>
>
> Hello Guys,i have a question . i was doing the technology lab for eigrp
> and
> came across ip default network commandmy question is , is there anyway to
> advertise the default route to other neighbors by using the above command
> with this one default-information allowed out ? instead of using
> redistrbute static in the eigrp ?i tried but didnt workRegards, Blogs and
> organic groups at
>
>
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-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining
www.Net-Workbooks.com
Sr. Technical Instructor

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