1 VCID Notification over ATM Link N. SonyCSL K. Toshiba L. Ericsson Ennovate Networks H. Toshiba Cisco IETF MPLS-WG Los Angels, April 1998.

2 Current Consensus - VCID Draft : WG Internet-Draft draft-ietf-mpls-vcid-atm-00.txt - Describe the VCID stuff in MPLS Framework document (draft-ietf-mpls-framework-02.txt) ==> had sent sentences to drafting team - VCID document specifies VCID notification over label swapped datalink (e.g., ATM link) (1) Inband notification (2) Outband notification (2)-a. using BLLI user specific field (7 bits) (2)-b. using UUI field (variable length) (*) p-p and p-mpt use different mechanism

3 Proposed Consensus 1. Describe the VCID stuff in MPLS architecture document (draft-ietf-mpls-arch-01.txt) 2. Add the operation with manual configuration without VCID notification procedure 3. Specifies VCID format and related messages (1) Inband notification (2) Outband notification (2)-a. using BLLI field (7 bits) (2)-b. using UUI field (variable length) => specifies 4. Specifies VCID notification procedure - inband/outband VCID notification

4 Common VCID Format Example - we should define a common VCID format for explicit and piggy-back LDP ==> we do not need to specify VCID format for each case. - MPLS VCID format MPLS VCID == VCID ::= Type + Length + Value | VCID Type | VCID Length | Reserved | | VCID Value | / / >

5 Master node Slave Node VCID ACK via Signaling VC 2. associates VCID and VC(VPI/VCI) 3. associates VCID and VC(VPI/VCI) Within UUI using Signaling VC 1. The VC is ready to be used! Procedure with UUI

6 VCID Format Example for UUI Bits Octet | Information element identifier | | | = User-user information element (0x7E) | 1 | | | 1 | Coding | IE instruction field | | | Ext | standard |Flag |Res. | IE action ind. | 2 | by ITU-T | SG11 | Length of contents of information element | 3-4 | WP | | Protocol discriminator | | | = Internet protocol/application (TBD) | 5 | | Internet protocol/application identifier | | | = MPLS VCID (0x01) | 6 | | | VCID Type | 7 | | | VCID Length | 8 | by IETF | MPLS-WG | Reserved | 9-10 | | | VCID Value | 11-TBD | (*) VCID Value Example : ESI(48bits)+ID(48bits)

7 Procedure with BLLI Master nodeSlave Node ATM Forum Signaling with unique BLLI VCID&BLLI ACK 4. associates VCID and VC(BLLI) 5. associates VCID and VC(BLLI) by a dedicated protocol or within a BIND message The VC is ready to be used! ACK via ATM Forum Signaling 2.

8 VCID Format Example for BLLI | VCID Type |VCID Length=12 | Reserved | LLID | | ESI of master node | | | | | ID | LLID (1 byte) : BLLI value ESI field (6 bytes) : ESI of master node ID (6 bytes) : master node decides unique identifier. (*) Master node; point-to-point link : upstream node or downstream node point-to-multipoint link : only upstream node

9 Master node Slave Node VCID ACK via shared control VC 2. associates VCID and VC(VPI/VCI) 3. associates VCID and VC(VPI/VCI) Within BIND mesasge via labeled VC 1. The VC is ready to be used! Procedure with Inband notification

10 VCID Format Example for Inband | VCID Type |VCID Length=12 | Reserved | | ESI of master node | | | | | ID | ESI field (6 bytes): ESI of master node ID (6 bytes) : master node decides unique identifier. (*) Master node; point-to-point link : upstream node or downstream node point-to-multipoint link : only upstream node

11 Drafting VCID document - VCID mechanism can be an additional mechanism to current LDP (and to piggy-back LDP) (*) Only we have to do is having a consistency on label ID field length in LDP - How to proceed; (1) Put in VCID mechanism in existing LDP spec. (2) Complete VCID mechanism as a separate document. Then, (a) put it in the LDP spec. (b) refer it in the LDP spec. with a brief description - Send to join the VCID document drafting;