Re: ip split horizon letting ospf routes slip through

From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Thu Nov 08 2007 - 05:51:22 ART

The "ip split-horizon" command does not have any effect on OSPF. The
"ip split-horizon" command is only used for RIP and IGRP. The "ip
split-horizon eigrp" command is of course for EIGRP.

HTH,

Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
bdennis@internetworkexpert.com

Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877.224.8987
Direct: +1.775.852.3995 (Outside the US and Canada)

Ahsan Mohiuddin wrote:
> hello group,
>
> i have routers R1, R3 (FR spokes) connected to Hub R5. R1 is advertising route 155.2.146.0 to R5, but I do not want R5 to send this update to R3. So, I have configured "ip split-horion" under R5's physical interface (subinterfaces not used). But it seems R3 is still learning the route from R1:
>
> O 155.2.146.0 [110/65] via 155.2.13.1, 00:10:27, Serial1/0
> [110/65] via 155.2.0.1, 00:10:27, Serial1/1
>
>
> Config of R5
>
> interface Serial1/0
> ip address 155.2.0.5 255.255.255.0
> encapsulation frame-relay
> ip split-horizon
> ip ospf priority 2
> frame-relay map ip 155.2.0.1 501
> frame-relay map ip 155.2.0.3 503
> frame-relay map ip 155.2.0.4 504
> end
>
> Config of R3
>
> interface Serial1/1
> ip address 155.2.0.3 255.255.255.0
> encapsulation frame-relay
> ip ospf priority 0
> serial restart-delay 0
> no dce-terminal-timing-enable
> frame-relay map ip 155.2.0.5 305
> end
>
> Config of R1
>
> interface Serial1/0
> ip address 155.2.0.1 255.255.255.0
> encapsulation frame-relay
> ip ospf priority 0
> serial restart-delay 0
> no dce-terminal-timing-enable
> frame-relay map ip 155.2.0.5 105
> end
>
>
> Any idea what i am doing wrong here?
>
> Thanks in adv
> -Ahsan
>
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