Encapsulation Methods for Transport of Fibre Channel Over MPLS draft-roth-pwe3-fc-encap-01.txt PWE3 IETF-64 November 2005 Ronen Solomon Moran Roth

64th IETF PWE3 2 Topics  Overview draft-roth-pwe3-fc-encap-00.txt  Applicability  Multiplexing FC frames into FC-PW  Signaling FC-PW  MTU consideration  Control word

64th IETF PWE3 3 Overview  draft-roth-pwe3-fc-encap-00.txt submitted July 2005  Fibre Channel attachment circuit through PWE3 to emulate end-to-end service connectivity.  Fibre Channel is an additional PW type  NSP is handled by T.11 for FC-BB-4 and is being worked on.

64th IETF PWE3 4 Applicability  FC PW allows the transport of point-to-point Fibre Channel  Faithfulness of a FC PW may be increased by providing low loss low re-ordering events low delay NSP handles bandwidth controlled behavior under network congestion

64th IETF PWE3 5 FC Over PW – Encapsulation Guideline  FC data frame, Control frames and Primitive Sequences are multiplexed into one PW.

64th IETF PWE3 6 Signaling FC-PW  The PW Type field in the PWid FEC element MUST be set to “FC Port Mode” FC Port Mode pending IANA allocation.  The control word is REQUIRED for FC pseudo-wires Therefore the C-Bit in the PWid FEC element MUST be set. If the C-Bit is not set the pseudo-wire MUST not be established and a Label Release MUST be sent with an “Illegal C-Bit” status code  There is no requirement for specific Interface Parameters for FC pseudo-wires Fragmentation may be signaled in the Interface Parameter Sub-TLV.

64th IETF PWE3 7 MTU consideration  The PSN MUST be able to transport the largest FC encapsulation frame if [FRAG] is not used. FC MAX frame is 2148 bytes including the overhead associated with the tunneling protocol MPLS/PWE3 [8 MPLS/VC + 4 Control word+8 FC-NSP]  Fragmentation of FC-PW may be used according to methodology described in [FRAG]

64th IETF PWE3 8 Control word  PW control word MUST be used for FC PW to facilitate the transport of short packets Primitive sequences –4byte-Primitive+8byte-FC-NSP+8byte-PWE/MPLS+4byte-Control word=24byte] Control frames Short data frames  FLAGS=0  FRG – may be used for fragmentation  Sequence number handling may be used however not required as handled by the NSP.  Padding is required to minimum 64 bytes.

64th IETF PWE3 9 PWE3 Requirements  Assign new PW Type “Fibre Channel port mode”  Adopt as PWE3 WG item