Question

Clearing a route from BGP

Asked by: scottshuler

I had an edge router which had a static route which was being distributed to BGP. I removed the static route and tried a clear IP BGP peer (Neighbor addr) but, the route still appears in all my other routers. I'd like to know how to get rid of this route.

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Asked On
2009-07-02 at 08:17:38ID24539882
Tags

routing BGP

Topic

Network Design & Methodology

Participating Experts
4
Points
500
Comments
7

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Answers

 

by: _jesper_Posted on 2009-07-02 at 08:41:44ID: 24764577

What router manufacturer are you using (cisco, juniper, ???)

 

by: bsohn417Posted on 2009-07-02 at 10:41:15ID: 24765722

first you should remove the statement
"redistribute static" from BGP config on you router.

Also check this link has BGP commands to clear neighbor from routing table. (relearn routes)
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml

 

by: _jesper_Posted on 2009-07-02 at 10:58:49ID: 24765890

He can't just blindly remove the "redistribute static" if he needs it for other route advertisements.

He needs to determine which routing protocol is announcing the route.

It could be static, IGP (RIP, EIGRP, OSPF, IS-IS), or explicitly configured within BGP as a network and nailed down.

 

by: scottshulerPosted on 2009-07-02 at 11:19:47ID: 24766098

Originally, there was a static route which I remove. When I do a show running-config the route is gone from the list of static routes. However, it reains a a bgp route when I do show IP route. Event if I do a clear IP BGP PEER soft out.

 

by: _jesper_Posted on 2009-07-02 at 11:29:25ID: 24766201

Do these:

sh ip route <netblock in question>
sh ip bgp <netblock in question>
sh run | i <netblock in question>

You can hide your public IP by changing the first two octets to XXX.XXX

 

by: szfecoPosted on 2009-12-02 at 10:38:02ID: 25955014

remove the redistribute static line from the bgp config and place it back.
sometimes I have the same problem, but I'm controlling the updates with a prefix-list included in a route-map.

anyways trace the network form the locations back and see where is it coming from.
maybe there is a static route or other route which is distributed by bgp from a different location.

HTH,
szfeco

 

by: SanjeevlokePosted on 2011-10-11 at 20:44:15ID: 36953470

I think the route must be redistributed somewhere or advertised in some other protocol.

1) sh ip route 10.0.0.1 ...check from which protocol route is learned.
2) check if you advertised in network statement of bgp and if its connected interface.
3) from remote router or PC trace the IP check were it ends
4) clear ip route 10.0.0.1


20120131-EE-VQP-002

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