From: shiran guez (shiranp3@gmail.com)
Date: Thu Nov 08 2007 - 06:11:57 ART
Gops
Nothing is blocking LSA in OSPF area accept link down as it is Link State
Protocol and his whole concept is one DB same to all neighbors.
Distance is locally significant and not advertised! so what you will do is
only block your self from using the route but not block the LSA from going
to your neighbors.
In an AREA all NEIGHBORS SHARE THE SAME DB.
On Nov 8, 2007 10:50 AM, Gupta, Gopal (NWCC) <gopal.gupta@hp.com> wrote:
> Hi Ahsan,
>
> As far as I know split horizon cannot block OSPF LSAs.
> What you can do is filter routes on R3 using Distance 255 for the route
> coming from R5.
>
> HTH
> Gops
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Ahsan Mohiuddin
> Sent: Thursday, November 08, 2007 14:01
> To: ccielab@groupstudy.com
> Subject: ip split horizon letting ospf routes slip through
> Importance: Low
>
> 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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-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:28 ART