From: John Jones (acer0001@gmail.com)
Date: Sun Oct 22 2006 - 19:24:18 ART
Just out curiosity then... What does the no arp frame command for you then?
Also, I thought it was recommended that no frame inv was supposed to be on
the physical interfaces when you have subinterfaces. Is this still true?
John
On 10/22/06, Brian Dennis <bdennis@internetworkexpert.com> wrote:
>
> Comments inline:
>
> 1. If I disable fra inverse-arp on an interface does it effect sub
> interfaces at all ?
>
> No.
>
> 2. Similarly should I disable inarp if I am asked to not to use it on a
> sub
> interface ?
>
> Do whatever is needed to meet the requirements of the task. The only
> time Frame Relay inverse ARP is used under a multipoint subinterface is
> when the "frame-relay interface-dlci" command is applied. If a Frame
> Relay map statement is used for IP then inverse ARP is disabled for IP
> on that DLCI. The logic is that if you have already statically mapped
> layer 3 to layer 2 why would the router still need inverse ARP?
>
> 3. Is there anything to do with inarp on p-to-p interfaces ?
>
> Manual or dynamic layer 3 to layer 2 mappings are not needed on P2P
> subinterfaces. Since there can only be one layer 2 address (DLCI) all
> layer 3 addresses are automatically mapped to the layer 2 address. You
> can verify this with the "show frame-relay map" command" As a side note
> a P2P will still response to inverse ARP requests from a remote router.
>
> 4. Finally as far as I observe no frame inverse-arp command only disable
> the
> processing (and mapping) of incoming arp responses, is there a way to
> stop
> sending arp responses ?
>
> You appear to have this backwards. The "no frame inverse-arp" command
> stops the sending of inverse ARP requests. Currently in the IOS there
> isn't a Frame Relay command that will stop the router from receiving and
> processing inverse ARP requests.
>
> HTH,
>
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Cagri Yucel
> Sent: Sunday, October 22, 2006 1:01 PM
> To: Group study
> Subject: Good old inverse arp
>
> A few questions I am confused about:
>
> 1. If I disable fra inverse-arp on an interface does it effect sub
> interfaces at all ?
>
> 2. Similarly should I disable inarp if I am asked to not to use it on a
> sub
> interface ?
>
> 3. Is there anything to do with inarp on p-to-p interfaces ?
>
> 4. Finally as far as I observe no frame inverse-arp command only disable
> the
> processing (and mapping) of incoming arp responses, is there a way to
> stop
> sending arp responses ?
> Many thanks
>
> --
> -cagri
>
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