From: Shanky (shankyz@gmail.com)
Date: Thu Jul 20 2006 - 04:50:06 ART
Hi,
To my understanding, the condition .. network should be classful and should
be in the local router's RT to be a candidate default route.
When you configure *ip default-network* the router considers routes to that
network for installation as the gateway of last resort on the router.
For every network configured with *ip default-network*, if a router has a
route to that network, that route is flagged as a candidate default route.
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml#ipnetwork
for EIGRP, the behaviour of default-information command is to control the
incoming/outgoing advertisement of default network and not to specifically
advertise a network as in OSPF/RIP.
Hope it helps.
Shanky
On 7/20/06, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
>
> Hi Alex,
>
> !Nice explanation!
>
> But to have the route flagged as a candidate default route, the router
> that
> is generating the default for a network also may need a default of its
> own.
>
> So I think, that in your configuration is missing something like:
>
> ip route 0.0.0.0 0.0.0.0 192.168.7.2
>
> I had a thread with Russel (I'm ccying, sorry for the spam), and this
> answers also the thread that he begun about Default-Information Blocking
> in
> EIGRP Not Working.
>
> R1#show ip route eigrp
> 192.168.7.0/30 is subnetted, 1 subnets
> D* 192.168.7.0 [90/54359808] via 123.123.123.3, 00:06:13, Serial0/0
> 123.0.0.0/8 is variably subnetted, 3 subnets, 3 masks
> D 123.0.0.0/16 [90/54485248] via 123.123.123.3, 00:06:13, Serial0/0
> D 123.0.0.0/8 [90/54485248] via 123.123.123.3, 00:06:13, Serial0/0
>
> So we have the Candidate marked (*)
>
> When applying this configuration
>
> router eigrp 10
> network 123.123.123.1 0.0.0.0
> no default-information in
> no auto-summary
>
> We see now that the route is no longer a Candidate Default route...
> (nice, thanks Alex)
>
> R1#show ip route eigrp
> 192.168.7.0/30 is subnetted, 1 subnets
> D 192.168.7.0 [90/54359808] via 123.123.123.3, 00:00:14, Serial0/0
> 123.0.0.0/8 is variably subnetted, 3 subnets, 3 masks
> D 123.0.0.0/16 [90/54485248] via 123.123.123.3, 00:00:14, Serial0/0
> D 123.0.0.0/8 [90/54485248] via 123.123.123.3, 00:00:14, Serial0/0
>
> Thanks
> Victor.
>
>
>
> -----Mensaje original-----
> De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de Alex
> De Gruiter (AU)
> Enviado el: Miircoles, 19 de Julio de 2006 07:39 p.m.
> Para: Jens Petter
> CC: CCIE LAB
> Asunto: RE: sending default with eigrp
>
> There are 2 ways to distribute a static route into EIRGP - using
> redistribution or flagging specific routes as candidate defaults.
>
> The 1st method you have in the configuration, "redistribute static
> route-map DEFAULT_STATIC_REDISTR", redistributes those routes you desire
> (in your case, static, and according to your route map).
>
> The 2nd method is a little more interesting; EIGRP traditionally
> operates by flagging candidate routes in the routing table, rather than
> generating a default 0.0.0.0/0 route into the process. If you have a
> default candidate network specified on the hub route, that route can be
> flagged to the spoke routers as a potential default route. You control
> the networks which are valid candidates with the access-list. For
> example, if you have the following configuration:
>
> Router#
> interface serial 0/0
> ip address 192.168.7.1 255.255.255.252
> interface Ethernet 0/0
> ip address 172.16.1.1 255.255.255.0
> ip default-network 192.168.7.0
> router eigrp 1
> default-information out 3
> network 172.16.1.0 0.0.0.2555
> network 192.168.7.0
> access-list 3 permit 192.168.7.0
>
> The subnet 192.168.7.0/30 is flagged as a candidate default route on the
> hub router by virtue of the "ip default-network" command. However this
> route is also flagged in EIGRP advertisements as a candidate default -
> you'll see it in the routing table with an "*".
>
> The access-list indicates which routes should be flagged as defaults
> (or, depending on whether the glass is half full or empty, what routes
> should not be). The ACL is an optional parameter - if you don't apply an
> ACL, then all candidate default routes are flagged when advertised.
> Applying an ACL allows you to restrict the routes that will be
> advertised, potentially useful if you have multiple candidate defaults,
> and want to control what will and will not be advertised.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Jens Petter
> Sent: Thursday, 20 July 2006 1:30 AM
> To: 'CCIE LAB'
> Subject: sending default with eigrp
>
> Hi,
>
>
>
> I am trying to send a default route with eigrp to other routers..
>
>
>
> This is my config :
>
>
>
> router eigrp 1
>
> redistribute static route-map DEFAULT_STATIC_REDISTR
>
> passive-interface default
>
> no passive-interface GigabitEthernet0/2
>
> no passive-interface ATM1/0.3
>
> network 213.162.233.108 0.0.0.3
>
> network 213.162.235.16 0.0.0.3
>
> default-information out DEFAULT
>
> no auto-summary
>
>
>
> ip access-list standard DEFAULT
>
> permit 0.0.0.0
>
>
>
> route-map DEFAULT_STATIC_REDISTR permit 1
>
> match ip address DEFAULT
>
>
>
>
>
> This is coming in fine to the eigrp topology table and routing table on
> the
> other routers..
>
>
>
> nhus-gw#sh ip eig to
>
> IP-EIGRP Topology Table for AS(1)/ID(213.225.71.129)
>
>
>
> Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
>
> r - reply Status, s - sia Status
>
>
>
> P 0.0.0.0/0, 1 successors, FD is 284160
>
> via 213.162.235.17 (284160/28160), Ethernet3/0
>
>
>
> D*EX 0.0.0.0/0 [170/284160] via 213.162.235.17, 1d03h, Ethernet3/0
>
>
>
>
>
> But what I am wondering is what is the default-information out DEFAULT
>
> Command really do. From what I see the default is sent fine without it
> to the other routers.. So why do we need this command and when do we
> need it..???
>
>
>
>
>
> Jens
>
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