Interesting :)
And, of course, if it were a designed feature, it should be documented.
Someone should call this in.
-------------------------------------------------
Tks | <mailto:[EMAIL PROTECTED]>
BV | <mailto:[EMAIL PROTECTED]>
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
John Neiberger
Sent: Thursday, March 29, 2001 12:23 AM
To: [EMAIL PROTECTED]
Subject: UPDATE: OSPF overriding 'no ip classless'
Okay, here are my latest findings. Bob and others wanted me to try
various
supernet routes to see how the routers reacted. Well, I did, and the
router
with 'no ip classless' is definitely behaving classlessly when OSPF is
running.
First, a recap. I have router A connected to router B and am running
OSPF.
Router A is originating a default route, and Router B has 'no ip
classless'
configured. The prefix for the link is 10.1.1.0/24.
By all official explanations of 'no ip classless', in this scenario if I
tried to ping an unknown subnet of 10.0.0.0/8, it would fail and
debugging
would show that the packets were unroutable. This is true when I used
RIP
v1, RIP v2, IGRP, and EIGRP. However, when I use OSPF it's a whole
'nuther
story! It shouldn't matter how the routes are installed, but for some
reason, Router B behaves as if 'ip classless' were configured if I run
OSPF.
Tonight, I first tried the original experiment and originated 0.0.0.0/0.
Router B behaved classlessly and would route packets for ANY destination
to
Router A.
Next, I tried redistributing the static route for 10.0.0.0/8. Packets
for
any subnet of 10.0.0.0/8 would be routed, all other destinations would
fail.
Again, classless behavior.
Thirdly, I redistributed a route for 8.0.0.0/5 just for grins. Packets
destined for anything in that range were routed (8.0.0.0/8 throught
11.0.0.0/8) but all other unknown subnets failed.
Aggggh!! I've tried this on two different routers and three different
IOS
versions and I get the same results. Where is it written that when OSPF
is
running that the router will now behave classlessly in spite of 'no ip
classless' being in the configuration?
I guess I have no problem with this, I just wish they would document it
somewhere. If someone would like to try these tests to verify the
results
I'd appreciate it. I'd love to get some verification so I know I'm not
just
losing my mind.
Thanks!
John
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