From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sun Oct 22 2006 - 19:32:23 ART
The "no arp frame-relay" command does nothing. In our IEWB-RS workbook
we demostrate that the "no arp frame-relay" command doesn't stop the
sending or receiving of inverse ARP requests.
That recommendation someone gave you was incorrect ;-) You do not need
to disable inverse ARP under the physical interfaces when using
subinterfaces. Think about it like this. Since the command isn't
inherited by the subinterfaces and the physical interface doesn't
normally have an IP address applied, what would the command do?
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)
________________________________
From: John Jones [mailto:acer0001@gmail.com]
Sent: Sunday, October 22, 2006 3:24 PM
To: Brian Dennis
Cc: Cagri Yucel; Group study
Subject: Re: Good old inverse arp
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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