I would think the redistribute connected  command is the reason.

Sent from my iPhone

On Mar 23, 2011, at 3:50 PM, "D'Estienne, Michael" 
<Michael.D'[email protected]<mailto:Michael.D'[email protected]>> wrote:

take a look at the routes in the remote routers and see if the subnet matches 
any of the connected or static routes in the core routers.
a router won’t originate a route if it wasn’t told to.
you can also look at the lsa of the route in the remote router and you’ll see 
the originating ospf route id.  then take a look at that router and review the 
ospf config.

mike

From: 
[email protected]<mailto:[email protected]>
 [mailto:[email protected]] On Behalf Of Walter 
Witkowski
Sent: Wednesday, March 23, 2011 3:52 PM
To: Enterasys Customer Mailing List
Subject: [enterasys] OSPF question

Hi all,

I have a question about route distribution in an environment where the routers 
are running OSPF, with any named interfaces all in AREA 0.  By named I mean any 
networks that have been entered using the OSPF "network" command.

In looking at a route table in one of the remote routers I see that it 
understands the existence of all networks back on the Core routers.  On the 
Core routers some of the networks  have not been added to the configuration 
with the  command

 "network 172.32.112.0 0.0.0.255 area 0.0.0.0"   (which I thought was necessary 
for the network to be advertised)

yet the remote router knows of the existence of several networks that where 
never entered with the "network" command

I also see where we have the following commands in the cores

 redistribute connected
  redistribute static


Can anyone explain how/why the remote routers know of these networks???  Does 
the router ospf process automatically assume any network that is not listed 
with the "network" command but active belong to area 0 and is automatically 
advertised?  Or are the redistribute commands having this effect?


thnks in advance





Walt Witkowski Primary Network Specialist - Sungard Higher Education
Office of Information Technology - Delaware County Community College
610-359-5017(phone) / 610-359-4123 (fax)/856-217-4430(cell)
<mailto:[email protected]>[email protected]<mailto:[email protected]>

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