Cell Relay Archive

["Chip Boling" <cboling@hiwaay.net>]

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