From: Nick Shah (nshah@xxxxxxxxxxxxxx)
Date: Sun Feb 03 2002 - 19:43:12 GMT-3
Q1. Yes, u need to have auto-summary on if you are using a classful default
gateway.
Q2. Not a Cisco Standard way, but yes you can do it, I have tried it and it
seems to work exactly the ip default-network way.
Q3. Behaviour of RIP has changed since 12.0 (??) and now u need
default-information originate to propagate default route to peers.
hth
Nick
----- Original Message -----
From: "michael robertson" <michael_w_2ca@yahoo.ca>
To: <ccielab@groupstudy.com>
Sent: Sunday, February 03, 2002 2:18 PM
Subject: EIGRP default network
> Hi, Group,
>
> I have a question about default network about eigrp.
>
> Question 1:
>
> As Eigrp doesn't understand 0.0.0.0 default network,
> so you have to explicitly specify a default network
> with command ip default-network, In my case, The
> topolody is as follows:
>
> R1-----R2-----R3---
>
>
> routing protocol is eigrp
> If I configure a loopback address in R3 with address
> 172.16.1.1 and say ip default-network 172.16.0.0 (
> should be classful for default network). When no
> auto-summary is on, I can't see default network in R2,
> what I see is a network 172.16.1.0 as follows:
>
> ---------------------------------
> 172.16.0.0/24 is subnetted, 1 subnets
> D 172.16.1.0 [90/1764352] via 192.168.1.246,
> 00:15:00, Serial0/1
>
> ----------------------------------
>
>
> My question here is that do you have to enable
> auto-summary in order to propogate a default network
> because it's classful.
>
> I can see in R3 it's marked as default gateway as
> follows:
>
> ----------------------------------
> * 172.16.0.0/24 is subnetted, 1 subnets
> C 172.16.1.0 is directly connected,
> FastEthernet1/1
>
> ----------------------------------
>
> Question 2:
> IF i don't use ip default network, I use 0.0.0.0
> instead in R3 and then redistribute this static route
> to EiGRP network, I have seen also in R2, 0.0.0.0 is
> marked as a default network, Can i do this way as a
> default network? I am not sure it's a standard way or
> not. But EIGRP doesn't understand 0.0.0.0, I
> redistribute here, I think it's OK, any comment?
>
> Question 3:
>
> If my routing protocol is RIP in the above scenario, I
> found that RIP doesn't understand 0.0.0.0 also, You
> have to redistribute. Is this againt Jeff's book page
> 751 's static default route case study.
>
> I have seen somewhere that you need to explicitly to
> redistribute 0.0.0.0 since a IOS version which I
> forget.
> Is it so??
>
>
> Any help will be appreciate as always
>
>
> Regards
>
> michael
>
>
>
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