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

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

Sriram Rupanagunta wrote:

> > > Can this assurance be made even while using multiple TCP
> > > connections b/n
> > > edge switch/routers ?
> > This question is N/A for FCIP, since only a single connection
> > is specified between FCIP gateways.  In iFCP, a single TCP connection
>
> Sometime back, FCIP folks mentioned that there is nothing in the
> FCIP spec that limits the number of connections to one. My
> understanding is FCIP leaves this to implementations, whether
> to use one connection or multiple.

The above is EXACTLY the reason I have raised this question. I hear
conflicting statements being made on this issue. I don't see how FCIP can
use multiple TCP connections per (S_ID, D_ID) pair and guarantee in-order
delivery without implementing buffering and re-ordering on the FC-IP
switch.

Both FCIP and iFCP MUST guarantee in-order delivery since all FC end ports
(N/NL_Ports) depend on this feature and FC-FLA Table 3 mandates this.

Regards,
Santosh


>
> Can someone clarify this once for all on this list please ?
>
> If there is no limit on the number of connections in FCIP,
> Santosh's question is valid. In that case, is it fair to
> say that FCIP does not guarentee orderly delivery ?
>
> - Sriram
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