Solved

OSPF - passive inbound only

Posted on 2009-07-06
4
271 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
Comment Utility
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 500 total points
Comment Utility
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
Comment Utility
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
Comment Utility
ty
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

If your business is like most, chances are you still need to maintain a fax infrastructure for your staff. It’s hard to believe that a communication technology that was thriving in the mid-80s could still be an essential part of your team’s modern I…
Join Greg Farro and Ethan Banks from Packet Pushers (http://packetpushers.net/podcast/podcasts/pq-show-93-smart-network-monitoring-paessler-sponsored/) and Greg Ross from Paessler (https://www.paessler.com/prtg) for a discussion about smart network …
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

743 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

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now