You can always put the quad zero route on all your routers, which solves the
problem as well.
Chuck
All your route are belong to us!
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Bob
Vance
Sent: Monday, April 16, 2001 1:10 PM
To: [EMAIL PROTECTED]
Subject: RE: Simpl-er way to explain Default Gateways [7:792]
A long time ago, in a galaxy far, far away (or whatever -- and,
actually, it was in Wright's "IP Routing Primer"), I learned that IGRP
does not advertise network 0.0.0.0 as a default candidate (even with
"redistribute static".
So, you have to define some other network to flag as a default candidate
and to advertise if you want IGRP to propagate it.
That's about all I will say --
except that I *highly* recommend that book.
It will make you think longer and harder about topics that you consider
simple and that you thought you knew than you ever wanted to.
-------------------------------------------------
Tks |
BV |
Sr. Technical Consultant, SBM, A Gates/Arrow Co.
Vox 770-623-3430 11455 Lakefield Dr.
Fax 770-623-3429 Duluth, GA 30097-1511
=================================================
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Kane, Christopher A.
Sent: Monday, April 16, 2001 2:11 PM
To: [EMAIL PROTECTED]
Subject: RE: Simpl-er way to explain Default Gateways [7:792]
IP route 0.0.0.0 0.0.0.0 = setups up a default route to either an IP
address
or an active interface. Used when no known route exists via a routing
protocol. I often use this when a customer is not getting any routes
from me
(not running BGP with me) and only needs a route out of their router
(access
layer) pointed to my gateway. (distribution layer).
IP default-gateway = setups up a default gateway to use if/when routing
dies. This comes in handy if the IOS happens to get corrupted. The
router
can still route to a directly connected gateway. Generally used while
troubleshooting the IOS problem. I've used it when a router's IOS has
gotten
corrupted which you'll usually know when you look at the hostname of
your
router and it shows "router-name(boot)>" This way, if need be, I can put
a
new IOS image on the gateway and then TFTP it do the crippled router.
IP default-network = I've seen this before but have never used it
myself.
CCO states:
"The argument network-number is a network number.
If the router has a directly connected interface onto that network, the
dynamic routing protocols running on that router will generate or source
a
default route. In the case of RIP and HELLO, this is the mention of the
pseudo-network 0.0.0.0. In the case of IGRP, it is the network itself,
flagged as an exterior route.
A router that is generating the default for a network may also need a
default of its own. This may be done by specifying a static route to the
network 0.0.0.0 via the appropriate router."
I'm not sure when/why you would use "default-network."
Anyone know?
Christopher A. Kane, CCNP
Senior Network Control Tech
Router Ops Center/Hilliard NOC
UUNET
(614)723-7877
-----Original Message-----
From: Circusnuts [mailto:[EMAIL PROTECTED]]
Sent: Monday, April 16, 2001 1:25 PM
To: [EMAIL PROTECTED]
Subject: Simpl-er way to explain Default Gateways [7:792]
I have a friend going through the CCNA classes & the questions he asks
always
dig up topics I have either forgotten or do not use consistantly.
Is there a simple way to explain when to you use:
IP Route 0.0.0.0 0.0.0.0
IP Default-Gateway
IP Default-Network
Thanks
Phil
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