Re: EIGRP / default-information allowed out

From: Narbik Kocharians (narbikk@gmail.com)
Date: Wed Sep 17 2008 - 11:01:39 ART

Note that i used network 0.0.0.0 to point to the Null0 and NOT any network,
and when you do that, it shows up as a directly connected network and then i
advertised it.

On Wed, Sep 17, 2008 at 6:58 AM, Sachin D <networker.ccie@gmail.com> wrote:

> Hello Narbik,
>
> In point 1 to originate default information, you originated default route
> using network command,
>
> I thought network command is only used to send updates to the interfaces
> in the specified networks. If you do not specify the network of an
> interface, the interface will not be advertised in any EIGRP update.
>
> But here you have advertised the static route using the network command can
> you please explain the behavior how the static is being advertised
>
> It works, But when i tried pointing some dummy subnet 100.0.0.0/24 towards
> Null0 and advertised it using "network 0.0.0.0" it is not advertised. But
> when I used "network 100.0.0.0 0.0.0.255". It got advertised
>
> If it is pointed towards any physical interface neither of them work. It
> seems something wrong with the Null0 Interface.
>
>
>
> Can you please comment on it
>
> 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.*
>
> Regards
> Sachin
>
> On Wed, Sep 17, 2008 at 7:07 AM, Narbik Kocharians <narbikk@gmail.com>wrote:
>
>> 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 <http://www.net-workbooks.com/>
>> Sr. Technical Instructor
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
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>>
>>
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>>
>>
>>
> 

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining
www.Net-Workbooks.com
Sr. Technical Instructor

Blogs and organic groups at http://www.ccie.net

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