From: Mark Lasarko (mlasarko@co.ba.md.us)
Date: Fri Jan 14 2005 - 16:55:37 GMT-3
Thank You Brian,
I do get the classful thing...
I made note of that in my example, as a response to validate the
default-network command for jellyboy.
(And maybe learn something from Robert M.)
My bad, I was trying to clarify one thing and questioned another at the
same time.
I certainly could have been more clear :)
Fortunately, there's always room for improvement!
My question here is in regards to phantom commands that don't seem to
do much, if anything.
Like "default network" (no dash), within the routing process itself.
I've been stumbling over a few of these lately that either don't do
what they are supposed to or do nothing at all.
That's what I mean when I say I am confused.
You may have just confirmed another?
"There isn't a "default-information originate" command for EIGRP. "
Yet another one where the command is there, and will be accepted, but
does nothing.
I see this now @
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/iprrp_r/ip2_c1g.htm
I keep thinking there should be some addendum, a master list of stuff
that does not work
Sometimes I forget that in the Cisco world it (usually) "depends" :)
Thanx again for the clarification.
Have a great day,
~M
>>> "Brian Dennis" <bdennis@internetworkexpert.com> 1/14/2005 2:38:40
PM >>>
Mark,
Mark,
The default-network should be a classful network. See below:
Rack2R1#sho ip route eigrp
D 172.16.0.0/16 [90/409600] via 10.1.1.2, 00:01:28, Ethernet0/0
150.2.0.0/32 is subnetted, 1 subnets
D 150.2.2.2 [90/409600] via 10.1.1.2, 00:01:31, Ethernet0/0
Rack2R1#sho run | in ip route <-- Notice: no static routes
Rack2R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Rack2R1(config)#ip default-network 150.2.2.2 <-- Not classful
Rack2R1(config)#do sho run | in (default-network|ip route)
ip route 150.2.0.0 255.255.0.0 150.2.2.2
Rack2R1(config)#ip default-network 172.16.0.0 <-- Classful
Rack2R1(config)#do sho run | in (default-network|ip route)
ip default-network 172.16.0.0
ip route 150.2.0.0 255.255.0.0 150.2.2.2
Rack2R1(config)#do sho ip route eigrp
D* 172.16.0.0/16 [90/409600] via 10.1.1.2, 00:03:58, Ethernet0/0
150.2.0.0/16 is variably subnetted, 2 subnets, 2 masks
D 150.2.2.2/32 [90/409600] via 10.1.1.2, 00:04:01, Ethernet0/0
Rack2R1(config)#
Notice that a static route was put in my configuration when I used the
default-network command for a non-classful network.
HTH
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
Mark Lasarko
Sent: Friday, January 14, 2005 9:21 AM
To: jellyboy@gmail.com; ccielab@groupstudy.com;
robert.mccallum@thus.net
Subject: RE: IGRP=default-network EIGRP=?
default-gateway?
I thought this was only applicable when the router was not being a
router??
Anyway, I was a bit curious, as I remember that, at least on recent
code,
IOS will parse EIGRP code in interesting ways with options that do not
seem to exist, for example:
3725#config t
Enter configuration commands, one per line. End with CNTL/Z.
3725(config)#router eigrp 1
3725(config-router)#default ?
address-family Enter Address Family command mode
auto-summary Enable automatic network number summarization
default-information Control distribution of default information
default-metric Set metric of redistributed routes
distance Define an administrative distance
distribute-list Filter networks in routing updates
eigrp EIGRP specific commands
maximum-paths Forward packets over multiple paths
metric Modify EIGRP routing metrics and parameters
neighbor Specify a neighbor router
network Enable routing on an IP network
offset-list Add or subtract offset from RIP metrics
passive-interface Suppress routing updates on an interface
redistribute Redistribute information from another routing
protocol
timers Adjust routing timers
traffic-share How to compute traffic share over alternate
paths
variance Control load balancing variance
3725(config-router)#default network ?
A.B.C.D Network number
3725(config-router)#default network 100.100.100.0
3725(config-router)#end
This does nothing, the router just accepts the command and forgets
about it?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Now, on to the default-network...
First, we see our EIGRP AS has two networks defined with no static
routes.
router eigrp 1
network 1.1.1.0 0.0.0.255
network 2.2.2.0 0.0.0.255
no auto-summary
!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Now we issue the command "ip default-network 100.100.100.0"
3725#config t
Enter configuration commands, one per line. End with CNTL/Z.
3725(config)#ip default-network 100.100.100.0
3725(config)#end
3725#sh run
!
router eigrp 1
network 1.1.1.0 0.0.0.255
network 2.2.2.0 0.0.0.255
no auto-summary
!
ip route 100.0.0.0 255.0.0.0 100.100.100.0
!
We see that the command inserted the line "ip route 100.0.0.0
255.0.0.0
100.100.100.0"
A classful route was entered as a result of the command
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Let's add a second default-network...
3725#
3725#config t
Enter configuration commands, one per line. End with CNTL/Z.
3725(config)#ip default-network 172.172.172.0
3725(config)#end
3725#sh run
!
router eigrp 1
network 1.1.1.0 0.0.0.255
network 2.2.2.0 0.0.0.255
no auto-summary
!
ip route 100.0.0.0 255.0.0.0 100.100.100.0
ip route 172.172.0.0 255.255.0.0 172.172.172.0
!
Again we see a classful static route installed for the network we
defined.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Not trying to over-simplify, just understand more :) ?????
Now I am more confused than when I started.
Can anyone explain this better?
I understand the installation of the classful networks,
it's the anomalies I can't get past
Commands that do nothing
April fools?
Not that it matters:
3725#sh ver
Cisco Internetwork Operating System Software
IOS (tm) 3700 Software (C3725-JK9S-M), Version 12.3(9b), RELEASE
SOFTWARE (fc1)
~M
>>> "McCallum, Robert" <robert.mccallum@thus.net> 1/14/2005 10:07:06
AM
>>>
try default-gateway
Robert McCallum
> -----Original Message-----
> From: jellyboy [mailto:jellyboy@gmail.com]
> Sent: 14 January 2005 15:03
> To: ccielab@groupstudy.com
> Subject: IGRP=default-network EIGRP=?
>
>
> Hi all, I was doing a lab which was running IGRP. My newer
> routers do not have IGRP in the IOS (!), so I was using EIGRP
> with auto-summary so simulate the classful properties of IGRP
> if you get my drift. The original exercise was not to allow
> an redistribution of static routes, but to allow a default
> route to another IGRP neighbor. The original solution was to
> use the default-network command which is automatically
> redistributed into IGRP. With running EIGRP instead of IGRP
> in my case the default-network does not seem to propogate a
> default route to its EIGRP neighbor. Apart from using a
> 0.0.0.0 and redistrubute static or redisributing a quad zero
> into another routing protocol and then redistribute that with
> EIGRP, does anyone know how to do the equivalent of the
> default-network with IGRP in EIGRP?
>
> Cheers,
>
> jellyboy
>
> ______________________________________________________________
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