MFA Forum requests PW Type Value for ATM Virtual Trunks

Peter Busschbach

Lucent Technologies

PE1 PE2

PSNATM Network ATM Network

Establish PWs for ATM routing and signaling channel

Establish PW for each ATM VC under control of ATM signaling

ATM/MPLS Control Plane InterworkingClient-to-Client

1-1 mapping between ATM VCs and Pseudo Wires

PE1 PE2

PSNATM Network ATM Network

ATM/MPLS Control Plane InterworkingVirtual Trunks

With Virtual Trunks, ATM VC establishment is transparent to PSN

Establish PW as Virtual Trunk

ME1 ME2

PSNATM Network ATM Network

ATM/MPLS Control Plane InterworkingVirtual Trunks – distributed implementation

The distributed implementation enables interworking with minimal modifications to ATM switches and LERs

L2E 1 L2E 2

Virtual Trunk is identified as a VPI range. E.g. {32, 63}

ME maps VPI range to the Virtual Trunk PW

{0, 31}

{32, 63}

{0, 31}

{32, 63}

What VPI range shouldbe used for this VT?A1

A2

A3

Translating VPI Ranges

To increase manageability, VPI ranges are locally significant

MEs translate VPI ranges

– This does not require the ME to be involved in ATM VC establishment

New PT Type Value

Liaison statement from MFA Forum requesting a new PW Type value for VTs

Existing values are not applicable

– 0x0003 ATM transparent cell transport does not allow for VPI translation

– 0x0009 ATM n-to-one VCC cell transport is defined for a single VCC

– 0x000A ATM n-to-one VPC cell transport is defined for a single VPC

Virtual Trunk Interworking Agreement is ready for Final Ballot