Re: FCIP/iFCP : Guarantee In-Order delivery for FC N/NL_ports

[Santosh Rao <santoshr@cup.hp.com>]

It is not only the desire to inter-operate with legacy FC devices that drives
this requirement.

This is a mandatory requirement, since FC-FLA Table 3 mandates that N/NL_Ports
originating FLOGI SHALL request in-order delivery in the FLOGI. (by setting
the "Sequential Delivery" bit in their class specific parameters for class 2 &
3 to 1.).

- Santosh

Y P Cheng wrote:

> > I have a question for the FCIP and iFCP folks. Do these 2 protocols still
> > assure in-order delivery of frames to the FC end nodes (N/NL_Ports)
> > when requested through the "Sequential Delivery" bit in FLOGI ?
> >
> > Can this assurance be made even while using multiple TCP connections b/n
> > edge switch/routers ?
> >
> > - Santosh
>
> If I may add that most FC devices out in the market will NOT receive
> out-of-order delivery because it does not go over the scatter/gather list
> from beginning on every incoming frame!  So, if FCIP and iFCP wish to work
> with legacy FC devices, they must learn from Brocade switches, i.e. assure
> in-order delivery.
>
> Y.P. Cheng, ConnectCom Solutions
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