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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. Topics. New draft draft-ietf-pwe3-fc-encap- 02 .txt Reliable congestion control

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fibre channel over mpls

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

topics
Topics
  • New draft draft-ietf-pwe3-fc-encap-02.txt
    • Reliable congestion control
    • Encapsulation format
    • Signaling of FC PW
fc pw congestion control rate control
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
fc pw congestion control selective retransmission
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
fc pw congestion control selective retransmission cont
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).
fc pw congestion control selective retransmission cont1
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
fc pw encapsulation

L2 header

MPLS label

PW label

FC PW

Control word (mandatory}

LAPB header

FC frame

FC frame

L2 CRC

FC PW encapsulation
fc pw control word
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)
signaling of fc pw
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.
summary
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 ?