Fibre Channel Over MPLS IETF/T.11 interworking draft-ietf-pwe3-fc-encap-02.txt Tuesday, November 7th, 2006 Moran Roth – Corrigent Ronen Solomon – Corrigent Munefumi Tsurusawa – KDDI LABs

2 Topics  New draft draft-ietf-pwe3-fc-encap-02.txt Reliable congestion control Encapsulation format Signaling of FC PW

3 FC PW congestion control - Rate control  Based on TFRC (RFC 3448)  CIR and EIR are configured per FC service and FCoMPLS frames are marked accordingly.  Throughout [Bytes/Sec] – actual sending rate is a function of loss event rate and round trip time (RTT).  Loss event – one or more frames dropped within a single LAPB window

4 FC PW congestion control - Selective retransmission  Based on LAPB (FC-BB-3 standard)  Reliable protocol Sequencing and re-sequencing mechanism Acknowledgments - to the sender  Frame loss retransmission

5 FC PW congestion control - Selective retransmission (cont.)  LAPB message type I-frame (information frame). Carries the actual FC information ( data and control) Includes N(S) and N(R) counters for sequencing and acknowledgment. S-frame (supervisory frame). RR ( Receiver Ready) – includes the N(R) counter to acknowledge sender frames. RNR ( Receiver Not Ready) – includes the N(R) counter to acknowledge sender frames and stop the transmitter. SREJ (Selective Reject) – indicates sequence numbers of dropped frames to feed the transmitter.  Recommended to send S-frames as high-priority (EF).

6 FC PW congestion control - Selective retransmission (cont.)  Retransmission protocol mechanism parameters T1-Poll Timeout T2 -Response Timeout K – window size N2 - Poll Retries  Protocol mechanisms ‘Poll’ and ‘final’ indication bits

7 FC PW encapsulation LAPB header FC frame L2 header MPLS label PW label Control word (mandatory} L2 CRC FC PW FC frame

8 FC PW control word  Control word is REQUIRED  A – address bit part of the LAPB protocol indication  FRG – fragmentation is not supported  Length – short frame indication used (minimum 40bytes FC frame)  Sequence number – not used ( LAPB sequencing)

9 FC PW LAPB header

10 Signaling of FC PW  PW type in FEC = FcPort  Control word is REQUIRED - C-bit in FEC must be set.  Interface parameters Four new Sub TLV – TBA Length of each 4 bytes Type = T1, T2,N2, K Both PE’s should agree on these value for succesful PW setup.

11 Summary  Assign new PW Type “Fibre Channel port mode”  Assign parameter ID for interface parameters SUB TLV  Draft-02 is ready for cross area review ?