From: cebuano (cebu2ccie@cox.net)
Date: Sun Jan 12 2003 - 13:00:10 GMT-3
Joe,
This is something I wrote down in my notes while studying default
routes, and I can't remember the exact source(s). I thought I might have
read it in Doyle's Vol.1, but I can't find the page(s). I know I also
did some research on this on CCO, and here are two links I've
uncovered...
http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a
0080094374.shtml#protocols
And
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configur
ation_guide_chapter09186a00800ca765.html#1001017
Terry Slattery's book has some mention of this as well on page 104.
HTH.
Elmer
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Joe Chang
Sent: Sunday, January 12, 2003 12:04 AM
To: ccielab@groupstudy.com
Subject: Re: EIGRP and "ip default-network"
I was trying to find information about this topic a while ago. Can you
tell
me where you found the two requirements for default network
redistribution
into EIGRP?
Thanks,
Joe
----- Original Message -----
From: "cebuano" <cebu2ccie@cox.net>
To: <ccielab@groupstudy.com>
Sent: Sunday, January 12, 2003 1:01 AM
Subject: EIGRP and "ip default-network"
> Hello, all.
> I'm testing the result of this command in EIGRP. Based on what I've
read
> in the past, EIGRP AUTOMATICALLY propagates the candidate default
> network into the EIGRP domain as the default candidate if these two
> requirements are met:
>
> 1. The "default-network" must be on a MAJOR CLASSFUL boundary.
> 2. The "default-network" must be in the routing table as
> External-EIGRP.
>
> But I'm not seeing the described behavior. Here's my scenario.
>
> 2511---rip---2514---EIGRP---2516---EIGRP---mc3810b
>
> 2514 is redistributing RIP into EIGRP, and the network in question is
> 192.168.10.0 between 2511 and 2514.
> 2516 is configured with "ip default-network 192.168.10.0" and installs
> this as its Gateway of Last Resort. But it's neighbor mc3810b
> does not treat this network as a Candidate Default.
>
> The relevant configurations and route tables are shown below. If
anyone
> has any idea what's not right, please let me know. Thanks.
> Elmer
>
> 2511#s
> !
> interface Loopback10
> ip address 5.5.5.1 255.255.255.255
> !
> interface Ethernet0
> ip address 192.168.10.1 255.255.255.0
> !
> router rip
> network 5.0.0.0
> network 192.168.10.0
> !
>
> 2514#s
> !
> interface Loopback10
> ip address 30.30.30.1 255.255.255.0
> !
> interface Ethernet0
> ip address 192.168.10.2 255.255.255.0
> !
> interface Ethernet1
> ip address 20.20.20.1 255.255.255.0
> !
> router eigrp 1
> redistribute rip
> network 20.0.0.0
> network 30.0.0.0
> default-metric 10000 1000 254 1 1500
> no auto-summary
> !
> router rip
> network 192.168.10.0
> !
>
> 2516#s
> !
> interface Loopback10
> ip address 40.40.40.1 255.255.255.0
> !
> interface Ethernet0
> ip address 20.20.20.2 255.255.255.0
> !
> interface Serial0
> ip address 50.50.50.1 255.255.255.0
> !
> router eigrp 1
> network 20.0.0.0
> network 40.0.0.0
> network 50.0.0.0
> no auto-summary
> !
> ip default-network 192.168.10.0
> !
>
>
> MC3810b#s
> !
> interface Loopback10
> ip address 60.60.60.1 255.255.255.0
> !
> interface Serial0
> ip address 50.50.50.2 255.255.255.0
> !
> router eigrp 1
> network 50.0.0.0
> network 60.0.0.0
> no auto-summary
>
>
>
>
> 2516#ir
>
> Gateway of last resort is 20.20.20.1 to network 192.168.10.0
>
> 50.0.0.0/24 is subnetted, 1 subnets
> C 50.50.50.0 is directly connected, Serial0
> 20.0.0.0/24 is subnetted, 1 subnets
> C 20.20.20.0 is directly connected, Ethernet0
> D EX 5.0.0.0/8 [170/537600] via 20.20.20.1, 00:05:21, Ethernet0
> D*EX 192.168.10.0/24 [170/537600] via 20.20.20.1, 00:06:05, Ethernet0
> 40.0.0.0/24 is subnetted, 1 subnets
> C 40.40.40.0 is directly connected, Loopback10
> 60.0.0.0/24 is subnetted, 1 subnets
> D 60.60.60.0 [90/2297856] via 50.50.50.2, 00:01:34, Serial0
> 30.0.0.0/24 is subnetted, 1 subnets
> D 30.30.30.0 [90/409600] via 20.20.20.1, 00:40:32, Ethernet0
>
>
>
> MC3810b#ir
>
> Gateway of last resort is not set
>
> 50.0.0.0/24 is subnetted, 1 subnets
> C 50.50.50.0 is directly connected, Serial0
> 20.0.0.0/24 is subnetted, 1 subnets
> D 20.20.20.0 [90/2195456] via 50.50.50.1, 00:01:58, Serial0
> D EX 5.0.0.0/8 [170/2451456] via 50.50.50.1, 00:01:58, Serial0
> D EX 192.168.10.0/24 [170/2451456] via 50.50.50.1, 00:01:58, Serial0
> 40.0.0.0/24 is subnetted, 1 subnets
> D 40.40.40.0 [90/2297856] via 50.50.50.1, 00:01:58, Serial0
> 60.0.0.0/24 is subnetted, 1 subnets
> C 60.60.60.0 is directly connected, Loopback10
> 30.0.0.0/24 is subnetted, 1 subnets
> D 30.30.30.0 [90/2323456] via 50.50.50.1, 00:02:00, Serial0
> .
.
.
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