From: Chris Lewis (chrlewiscsco@yahoo.com)
Date: Mon Nov 14 2005 - 11:45:02 GMT-3
I'm sorry TJ, I'm not sure I follow:
The config supplied (it did not say for which router) was as follows:
int s0/0
encap frame-relay
no frame-relay inverse-arp
ip address 1.1.1.X 255.255.255.252
frame-relay interface-dlci 40X
What I was trying to point out was the following:
1. All DLCIs are by default assigned to the physical interface, so the last command here adds nothing over and above what teh router would do if it were not there.
2. with no fram-relay inverse-arp and no manual map statements, there are no L3 to L2 mappings, so no packets will be sent out that interface.
You seem to be thinking that turning off inverse-arp will not allow the router to assign a DLCI to an interface. This is incorrect. inverse-arp is about mapping a layer 3 destination to a local layer 2 address.
"Mitchell, TJ" <tmitchell@allianttech.com> wrote:
Chris --
R3 is going to use the Frame-relay map command under the physical
interface.
Next the configuration that was provided for the spokes (by Stephen)
will work fine, since you disabled inverse arp on the spokes the DLCI's
need to be specified.
Using that configuration doesn't configure L3 - L2 mapping on the
physical interface for the spokes.
Thanks
T.J. Mitchell
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Chris Lewis
Sent: Monday, November 14, 2005 9:10 AM
To: Skinner, Stephen; 'Arun Arumuganainar'; ccielab@groupstudy.com
Subject: RE: IE Lab Exercise
Stephen,
I don't see how this would help. All DLCI's are assigned to the physical
interface by default, so assigning the DLCI with that command here does
nothing. Also this is a multipoint interface, so without some layer 3 to
layer 2 mapping, no packets are going anywhere.
Arun, I believe the IE lab solution guide gives a working config, can't
you look at that? From memory I think the OSPF section gives a clue as
to how spoke to spoke connectivity is achieved. On the hub you can still
use map statements.
Chris
"Skinner, Stephen" wrote:
int s0/0
encap frame-relay
no frame-relay inverse-arp
ip address 1.1.1.X 255.255.255.252
frame-relay interface-dlci 40X
HTH
Stephen Skinner
> -----Original Message-----
> From: nobody@groupstudy.com [SMTP:nobody@groupstudy.com]
> Sent: 14 November 2005 11:17
> To: ccielab@groupstudy.com
> Subject: IE Lab Exercise
>
> *** WARNING : This message originates from the Internet ***
>
> Here are conditions .
>
> 1) Topology HUB and SPOKE . R3=> Hub R4 and R5 => Spoke .
> 2) Use only Physical interfaces on all the 3 routers
> 3) Do not use Dynamic mapping ( No Inverse ARP )
> 4) Do not configure static Layer 3 to Layer 2 Mapping on spokes
>
> Just wondering How to configure this ?. Any body can throw some light
on
> it .
> It would be great !!!
>
> Thanks and Regards
> Arun
>
>
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