Cell Relay Archive

["novice" <syyang@sungmi.co.kr>]

Multiple Loopback is recommended by the last I.610 (1999).

I.610 has 3 editions,
1st was in 1993,
2nd was  in 1995,
3rd was in 1999.


>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
>
>
>