From: Rsharma (cciers09@gmail.com)
Date: Tue Feb 03 2009 - 15:17:53 ARST
Hi ,
Just want to knw the reason behind it that Disabling split horizon on
the incoming interface cause the system to perform this validation check .
I tried this with Dynamip lab and its correct but i wasnt able to
co-relate Split Horizon with Validate check .
Thanks!!!!!!
Rsharma :-)
ALL From_NJ wrote:
> I am learning to search the docs ... I have a feeling I will need
> them!!! ;-)
>
> Here is a link to this command (watch the ugly word wrap):
> http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_rip.html#wp1012874
>
> Copied and pasted from the link:
>
> To have the Cisco IOS software validate the source IP address of
> incoming routing updates for Routing Information Protocol (RIP) and
> Interior Gateway Routing Protocol (IGRP) routing protocols, use the
> validate-update-source command in router configuration mode. To
> disable this function, use the no form of this command.
>
> validate-update-source
> no validate-update-source
>
> ---->>>> Usage Guidelines
>
> This command is applicable only to RIP and IGRP. The software ensures
> that the source IP address of incoming routing updates is on the same
> IP network as one of the addresses defined for the receiving interface.
>
> Disabling split horizon on the incoming interface will also cause the
> system to perform this validation check.
>
> For unnumbered IP interfaces (interfaces configured as IP unnumbered),
> no checking is performed.
> Examples
>
> The following example configures a router not to perform validation
> checks on the source IP address of incoming RIP updates:
>
> router rip
> network 10.105.0.0
> no validate-update-source
>
> HTH,
>
>
>
>
> On Mon, Feb 2, 2009 at 1:43 PM, Rsharma <cciers09@gmail.com
> <mailto:cciers09@gmail.com>> wrote:
>
> Hi,
>
> Validate Update source command in RIPv2 n IGRP .
> What exactly is being scanned by protocol to validate ....????
>
> can anyone zoom on Validate action ??
>
> Thanks
> Rsharma
>
>
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