RE: is frame-relay inverse-arp really disabled?

From: Brian Dennis (brian@labforge.com)
Date: Sun May 25 2003 - 03:31:35 GMT-3

• Next message: Brian Dennis: "RE: Configure clock rate"
• Previous message: Ciscolab: "discontinuous OSPF Area"
• Maybe in reply to: Jonathan V Hays: "is frame-relay inverse-arp really disabled?"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]

Yes, P2P subinterfaces do not need mappings for any protocol. The DLCI
assigned to the subinterface which can only be one on a P2P subinterface
is assumed to be the layer 2 address for everything. The logic is that
since there can only be one layer 2 address that everything
automatically maps to it.

Active is the status of the DLCI. Shutdown the interface on the other
side and you should see it change to "inactive".

Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jonathan V Hays
Sent: Saturday, May 24, 2003 8:43 PM
To: ccielab@groupstudy.com
Cc: 'Brian Dennis'
Subject: RE: is frame-relay inverse-arp really disabled?

> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of Brian Dennis
> Sent: Saturday, May 24, 2003 3:44 PM
> To: 'Jonathan V Hays'; ccielab@groupstudy.com
> Subject: RE: is frame-relay inverse-arp really disabled?
>
>
> R5 is a point-to-point subinterface so this means that it doesn't need
> inverse-arp. R5 assumes every address of the 10.100.0.0/16
> subnet is at the other end of the DLCI.
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
>

Brian,

Thanks for the reply. Restating in my own words, I think you are saying
that on a point-to-point frame-relay interface, mapping IP addresses is
not needed for frame-relay (and TCP/IP) to communicate across the link.
What you say seems logical and it's good that IOS has some common sense.
;-)

However, I'm still a bit puzzled on the output of "show frame-relay map"
which says "active" - does this mean that inverse-arp is active, in
spite of having disabled it on the other end. Or maybe that's my
misinterpretation of the output?

-Jonathan

r5#show frame-relay map
Serial1.1 (up): point-to-point dlci, dlci 503(0x1F7,0x7C70), broadcast
          status defined, active
r5#

• Next message: Brian Dennis: "RE: Configure clock rate"
• Previous message: Ciscolab: "discontinuous OSPF Area"
• Maybe in reply to: Jonathan V Hays: "is frame-relay inverse-arp really disabled?"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]

This archive was generated by hypermail 2.1.4 : Mon Jun 02 2003 - 15:13:47 GMT-3