From: Cisco Key (ciscokey@googlemail.com)
Date: Sun Oct 15 2006 - 04:41:53 ART
Hi Ladies and Gentleman
Is there anyone that can advise me?
Thanks in advance
Paul
On 11/10/06, Cisco Key <ciscokey@googlemail.com> wrote:
>
> Hi all
>
> Wonder if you can help me with the following problem:
>
> Forgive me if this has been discussed before:
>
> Scenario
>
> Hub Router
> / \
> / \
> Spoke Router-A Spoke Router-B
>
> I have analysed the following:
>
> If I disable inverse arp on Spoke Router B, I still get a dynamic mapping
> from Spoke Router A on Spoke Router B but nothing for Spoke Router B that's
> of course from a dynamic perspective!
>
> So am I correct in saying when you disable inverse arp on a router it
> means that the router will not map dynamic arp but will still receive a
> dynamic mapping from its neighbour router.
>
> Now am I correct in assuming if you want to disable inverse arp you will
> have to do it on all routers
>
> Secondly if you have static maps configured or point to point interfaces
> you don't need to disable inverse arp
> or
> But should you have frame-relay interface-dlci configured and multipoint
> interface or the default NBMA then you would need to disable inverse arp
>
> Also if I may ask what does no arp frame-relay do as per my testing it had
> no affect on any of the dynamic mappings
>
> I know what arp frame-relay does by definition given a network protocol
> for example IP the arp frame-relay command determines the corresponding
> hardware address which would be a dlci for frame-relay
>
> This is the same for normal arp but inverse arp is only used for example
> in a bootp scenario whereby a device has a layer 2 address and asks for a
> layer 3 address same as frame relay inverse arp whereby you are a dlci layer
> 2 is looking for a ip address to be mapped to
>
> What scenario would no arp frame-relay do?
>
> Apologies for the jabber but I need clarity
>
> thanks for you assistance in advance
>
> Best Regards
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