Improve company productivity with a Business Account.Sign Up

x
?
Solved

OSPF - passive inbound only

Posted on 2009-07-06
4
Medium Priority
?
302 Views
Last Modified: 2012-05-07
On a Cisco 2811 router I want to receive routes but not broadcast and routes on a particular interface.  What is the best way to do this?  I believe

router ospf 1
.
.
 pass-interface fastethernet 1/0

...would stop both receipt and sending.  Thanks.
0
Comment
Question by:amigan_99
  • 2
4 Comments
 
LVL 50

Expert Comment

by:Don Johnston
ID: 24790152
The challenge is that OSPF doesn't advertise "routes". It propagates the link state database (topology) of the network. The routers then create a routing table based on this topology. So you really can't decide what routes to advertise.

There are exceptions though. If one of the networks you don't wish to advertise is connected to your router, simply don't make that interface part of the OSPF topology (Don't have a network statement for that interface).

If the network you don't want to advertise is not connected to your router (you're learning it through OSPF), then the only way to avoid advertising it is to put that network and the other router in different areas. Then you have more control over what gets advertised.

I would help to have a more specific idea of what you want to accomplish.
0
 
LVL 23

Accepted Solution

by:
that1guy15 earned 2000 total points
ID: 24790184
Another option would be to use a route filter on the receiving routers and have them filter the unwanted incoming routes.

That is if you contril those routers.
0
 
LVL 1

Author Comment

by:amigan_99
ID: 24790297
Some more details..

I have an MPLS CE from AT&T.  They use BGP to communicate routes between my various CE routers at various sites.  I am having AT&T redistribute the routes learned via BGP into OSPF and I want to hear
these routes at each site's core router.  I want to the core router to learn about the routes in the MPLS cloud via OSPF.  Then if those routes disappear (say the T1 goes our or the MPLS CE router fails) I will have floating static routes with defined higher metric to send the traffic to VPN (perhaps DMVPN, perhaps regular IPsec tunnels).  The AT&T CE router does not need to hear my link state info from my core.  Clearer?
0
 
LVL 1

Author Closing Comment

by:amigan_99
ID: 31600395
ty
0

Featured Post

Improve Your Query Performance Tuning

In this FREE six-day email course, you'll learn from Janis Griffin, Database Performance Evangelist. She'll teach 12 steps that you can use to optimize your queries as much as possible and see measurable results in your work. Get started today!

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

This program is used to assist in finding and resolving common problems with wireless connections.
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…

595 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question