From: Antonio Soares (amsoares@netcabo.pt)
Date: Tue May 15 2007 - 20:18:10 ART
Hello group,
I was playing with FRF.16 and i noticed that the command "no arp
frame-relay" gets added automatically to the physical interface as soon as
apply "encapsulation frame-relay mfr xxx":
++++++++++++++++++++++++++++++
!
hostname R4
!
frame-relay switching
!
interface MFR45
no ip address
frame-relay intf-type dce
!
interface MFR45.1 point-to-point
ip address 45.45.45.4 255.255.255.0
frame-relay interface-dlci 999
!
interface Serial0/1
no ip address
encapsulation frame-relay MFR45
clock rate 64000
no arp frame-relay
!
++++++++++++++++++++++++++++++
!
hostname R5
!
interface MFR45
no ip address
!
interface MFR45.1 point-to-point
ip address 45.45.45.5 255.255.255.0
frame-relay interface-dlci 999
!
!
interface Serial0/1
no ip address
encapsulation frame-relay MFR45
no arp frame-relay
!
++++++++++++++++++++++++++++++
I don't any see reference to this is the configuration guide.
By the way, i have the two routers above connected back-to-back and MFR
works fine.
But i was trying to configure this feature over a regular frame-relay switch
but i'm not able to make it work.
I was trying this:
R1-S0/0---DLCI 102----FR SWITCH----DLCI 201---S0/0-R2
R1-S0/1---DLCI 102----FR SWITCH----DLCI 201---S0/1-R2
With the same type of config as above. Do i need to modify something in my
frame-relay switch ?
Thanks.
Antonio
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sean.Zimmerman@clubcorp.com
Sent: terga-feira, 15 de Maio de 2007 21:52
To: Brian Dennis
Cc: Cisco certification; Cisco Key; nobody@groupstudy.com; Sergio Silva
Subject: Re: ARP Frame relay
Thanks Brian.
I've taken three labs, and every time, especially the last time, I really
had to struggle to answer many of the faults in the score report. I
understand inverse arp, but I don't understand why Cisco even bothered
introducing the 'no arp frame-relay' command. I've seen it in ATM-Frame SIW
examples, and I've read it's a dependency for auto-install. I'm just trying
to make sure I didn't miss something fundamental such as this.
Sean
Brian Dennis <bdennis@internetworkexpert.com> Sent by: nobody@groupstudy.com
05/15/2007 03:16 PM
Please respond to
Brian Dennis <bdennis@internetworkexpert.com>
To
<Sean.Zimmerman@clubcorp.com>, Sergio Silva <spmsilva@gmail.com> cc Cisco
certification <ccielab@groupstudy.com>, Cisco Key <ciscokey@googlemail.com>,
<nobody@groupstudy.com> Subject
Re: ARP Frame relay
Sean,
No. You are not any safer applying a command that has no effect.
When I grade a mock lab and see extra commands that aren9t needed
whatsoever it just shows that the candidate doesn9t fully understand the
topic/technology. When the proctors are grading your real lab you want your
solutions to appear as precise as possible. Don9t apply commands that have
no effect 3just to be safe2.
--Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP) bdennis@internetworkexpert.com
Internetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Direct: 775-745-6404 (Outside the US and Canada)
On 5/15/07 11:34 AM, "Sean.Zimmerman@clubcorp.com" <Sean.Zimmerman@clubcorp.com> wrote:
> > I'm kind of getting the impression here that if we're asked to disable > automatic l2-l3 frame-relay mapping methods that we should now issue a 'no arp > frame-relay' in addition to 'no frame inv'. Should be safe, right? > > Sean > > > > "Sergio Silva" <spmsilva@gmail.com> > Sent by: nobody@groupstudy.com 05/15/2007 01:23 PM Please respond to > "Sergio Silva" <spmsilva@gmail.com> To "Brian Dennis" > <bdennis@internetworkexpert.com> cc "Cisco Key" > <ciscokey@googlemail.com>, "Cisco certification" > <ccielab@groupstudy.com> > Subject > Re: ARP Frame relay > > > > > Thanks Brian > > Its just its documented in practical studies as per the following > > Router(config-if)no frame-relay inverse-arp Disables the sending > of Inverse ARP requests. Use this command in conjunction with no arp > frame-relay to prevent the dynamic mapping of PVCs. > Router(config-if)no arp > frame-relay Disables ARP responses. Use this in conjunction with the no > frame-relay inverse-arp command. > > So I just needed clarity on this > > thank > p > > > > On 15/05/07, Brian Dennis <bdennis@internetworkexpert.com> wrote: >> > >> > The "no arp frame-relay" command does not stop the router from sending >> > inverse-ARP requests or replying to inverse-ARP requests. The command >> > does >> > not have any effect on inverse-ARP whatsoever. If you think about >> > it there isn't support for ARP in Frame Relay to begin with so why >> > would you ever >> > need to disable it? Frame Relay supports inverse-ARP but not ARP. >> > >> > Inverse Address Resolution Protocol >> > http://www.internetworkexpert.com/rfc/rfc1293.txt >> > >> > HTH, >> > >> > Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP) >> > bdennis@internetworkexpert.com >> > >> > Internetwork Expert, Inc. >> > http://www.InternetworkExpert.com >> > Toll Free: 877-224-8987 >> > Direct: 775-745-6404 (Outside the US and Canada) >> > >> > >> > >> > On 5/15/07 5:29 AM, "Cisco Key" <ciscokey@googlemail.com> wrote: >> > >>> > > Hi Group >>> > > >>> > > I do apologise if this question has been asked a million times before, >> > but I >>> > > have been searching the archives and have still not found any definitive >>> > > answer on the use/uselessness of ARP Frame-relay, >>> > > >>> > > I have found the following: >>> > > >>> > > ARP Frame-relay no arp frame-relay" also to circumvent >>> > > sending out ip >>> > > address to DLCI binding information no arp frame-relay that this will >> > kill >>> > > auto install Router(config-if)no frame-relay inverse-arp Disables the >>> > > sending of Inverse ARP requests. Use this command in >>> > > conjunction with >> > no >>> > > arp frame-relay to prevent the dynamic mapping of >> > PVCs. Router(config-if)no >>> > > arp frame-relay Disables ARP responses. Use this in conjunction with >> > the >>> > > no frame-relay inverse-arp command. >>> > > >>> > > Is this command really needed, I know this use to be used with ATM, but >> > I do >>> > > not really see the use of this command if no frame-relay inverse-arp >> > does >>> > > the job >>> > > >>> > > Please comment >>> > > >>> > > Thanks >>> > > Paul >>> > > >>> > >
This archive was generated by hypermail 2.1.4 : Fri Jun 01 2007 - 06:55:21 ART