Cell Relay Archive

[Afroz Lateef <afroz.lateef@fnc.fujitsu.com>]

Hi Chip,

I remember this being in one of the latest ITU docs about OAM. I don't remember
the spec number though,
but it is in the standards.

Afroz Lateef

Chip Boling wrote:

> I have seen in one chipset vendor's documentation a paragraph on using a
> value of all 0's in the OAM Loopback's location ID (LLIC) field to initiate
> a loopback from each node along a VC/VP.  It says that when a node receives
> a loopback request with a location ID of all 0's, it should send a loopback
> response with the station's location id copied into the response's source
> ID.  The original loopback would of course be sent on downstream for other
> nodes to process (or not process as the case may be).
>
> I know that the actions taken by an ATM node when the LLID field is anything
> other than all 1's is not defined by either I.610 or the ATM Forum UNI 3.1
> specifications.
>
> This does appear to be useful to perform discovery of ATM nodes that may
> support this use of loopback.
>
> I was wondering if this multiple loopback technique is defined by any
> specific standard, if it is supported by various ATM product vendors, or if
> it is just something a technical write dreamed up to make people post
> questions to comp.dcom.cell-relay.
>
> - Chip Boling
>    cboling@hiwaay.net