Following is some info from Cisco's site:
http://www.cisco.com/warp/public/103/eigrp8.html
Default Routing
There are two ways to inject a default route into EIGRP: redistribute a
static route or summarize to 0.0.0.0/0. Use the first method when
you want to draw all traffic to unknown destinations to a default route at
the core of the network. This method is effective for advertising
connections to the Internet. For example:
ip route 0.0.0.0 0.0.0.0 x.x.x.x (next hop to the internet)
!
router eigrp 100
redistribute static
default-metric 10000 1 255 1 1500
The static route that is redistributed into EIGRP does not have to be to
network 0.0.0.0. If you use another network, you must use the ip
default-network command to mark the network as a default network. Please
refer to Configuring a Gateway of Last Resort for further
information.
Summarizing to a default route is effective only when you want to provide
remote sites with a default route. Since summaries are configured
per interface, you don't need to worry about using distribute-lists or other
mechanisms to prevent the default route from being propagated
toward the core of your network. Note that a summary to 0.0.0.0/0 overrides
a default route learned from any other routing protocol. The
only way to configure a default route on a router using this method is to
configure a static route to 0.0.0.0/0. (Beginning in Cisco IOS
Software 12.0(4)T, you can also configure an administrative distance on the
end of the summary-address command, so the local summary
doesn't override the 0.0.0.0/0 route).
router eigrp 100
network 10.0.0.0
!
interface serial 0
encapsulation frame-relay
no ip address
!
interface serial 0.1 point-to-point
ip address 10.1.1.1
frame-relay interface-dlci 10
ip summary-address eigrp 100 0.0.0.0 0.0.0.0
Regards,
Murtaza
----- Original Message -----
From: "s vermill"
To:
Sent: Sunday, January 13, 2002 4:33 PM
Subject: EIGRP 'default network' Rehash [7:31799]
> Sorry to bring this up again but apparently, for at least some of us, it
> needs to be. I chimed in the other day and offered a way to get EIGRP to
> distribute a default route. That basically amounted to simply defining a
> static to 0.0.0.0 and redistributing static into EIGRP (whoever corrected
me
> by pointing out that the 'network 0.0.0.0' command isn't necessary, I
thank
> you (it was in BSCN)).
>
> Wayne jumped in and explained some problems with EIGRP and the 'ip
> default-network' command. I thought it all sounded quite reasonable. So
I
> tried this in the lab for several hours today (no "get a life" remarks
> please). I must be really dense, because nothing I try works quite the
way
> (that I thought) it was described. It seems that the only way to
> sucessfully use the default-network is to configure it on every single
> router in the AS (I tried this with RIP just as a sanity check and it
worked
> just fine).
>
> If that is the case, can a good argument be made in favor of this approach
> over redistributing static? Or summarizing to 0.0.0.0 0.0.0.0 on an
> interface? Both of those, at least, propogate throughout the AS after
> configuration on just one router.
>
> Thanks in advance,
>
> Scott
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=31824&t=31799
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