Re: [PWE3] Fibre Channel Drafts - Last Call
Black_David@emc.com Tue, 28 April 2009 00:31 UTC
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Thread-Topic: Re: Fibre Channel Drafts - Last Call
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Subject: Re: [PWE3] Fibre Channel Drafts - Last Call
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With the split of the FC PW into two drafts, the changes below apply to Section 3 of draft-ietf-pwe3-fc-flow-00.txt . They still need to be made. Thanks, --David -----Original Message----- From: Black, David Sent: Tuesday, August 26, 2008 6:35 PM To: pwe3@ietf.org Cc: Black, David; 'Moran Roth' Subject: FW: [PWE3] I-D Action:draft-ietf-pwe3-fc-encap-08.txt The draft was posted this time. I've diff'ed this draft against the -07 version. The results look good; I have a few minor edits to the new timing material in Section 7: OLD: while the device is unable to forward these Primitive Sequence due to backpressure indication, it shall flush its respective buffer (PSN- facing if the Primitive Sequences were received from the CE, CE- facing if they were received from the remote PE), and shall forward the Primitive Sequences. NEW: (change "shall" to "MUST") while the device is unable to forward these Primitive Sequence due to backpressure indication, it MUST flush its respective buffer (PSN- facing if the Primitive Sequences were received from the CE, CE- facing if they were received from the remote PE), and MUST forward the Primitive Sequences. OLD: Another case is when there is no specific backpressure indication, rather Primitive Sequences are being delayed due to retransmission of dropped frames. In this case also, the PE shall flush its PSN-facing buffer and shall forward the Primitive Sequences. NEW: (clarify paragraph, add retransmission sentence, add explanation of why R_T_TOV is important) Another case is when there is no specific backpressure indication, but the Primitive Sequences cannot be immediately forwarded due to frames awaiting retransmission that must be sent first. In this case, the PE MUST flush its PSN-facing buffer and MUST forward the Primitive Sequences. Long sequences of the same Primitive Sequence MUST be suppressed as described in [FC-BB]. If the buffer clearing actions described in the previous paragraphs fail to ensure that the round trip latency for Primitive Sequences is less than R_T_TOV, the Fibre Channel link that is carried by the pseudowire may fail or may go offline and remain in that state because an R_T_TOV timeout in used in Fibre Channel's Link Initialization, Link Failure and Link Reset protocols (see Section 7 of [FC-FS]). Therefore, the FC PW SHOULD NOT be used when the latency across the FC PW may exceed 0.5 * R_T_TOV. OLD: To guarantee correct operation of this mechanism FC PW SHOULD NOT be used in environments where the RTT may have high variability, i.e., environments where the estimated RTT may not be off by more than 5% of MIN(E_D_TOV,R_A_TOV). NEW: To guarantee correct operation of this mechanism FC PW SHOULD NOT be used in environments where the RTT may have high variability, i.e., environments where the estimated RTT may be off by more than 5% of MIN(E_D_TOV,R_A_TOV). ^ | Remove "not" ------------------------------/ I think this is ready to go with these changes - if we treat the last one as a thinko, they're all editorial and could be dealt with at IETF Last Call. Thanks, --David -----Original Message----- From: pwe3-bounces@ietf.org [mailto:pwe3-bounces@ietf.org] On Behalf Of Internet-Drafts@ietf.org Sent: Tuesday, August 19, 2008 3:45 PM To: i-d-announce@ietf.org Cc: pwe3@ietf.org Subject: [PWE3] I-D Action:draft-ietf-pwe3-fc-encap-08.txt A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Pseudowire Emulation Edge to Edge Working Group of the IETF. Title : Encapsulation Methods for Transport of Fibre Channel frames Over MPLS Networks Author(s) : M. Roth, et al. Filename : draft-ietf-pwe3-fc-encap-08.txt Pages : 40 Date : 2008-08-19 A Fibre Channel pseudowire (PW) is used to carry Fibre Channel frames over an MPLS network. This enables service providers to offer "emulated" Fibre Channel services over existing MPLS networks. This document specifies the encapsulation of Fibre Channel PDUs within a pseudowire. It also specifies the procedures for using a PW to provide a Fibre Channel service. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-pwe3-fc-encap-08.txt Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft.
- Re: [PWE3] Fibre Channel Drafts - Last Call Black_David