Re: iSCSI: Stage Transitions

[Subrahmanya Sastry K V <skotra@npd.hcltech.com>]

Mike,

section 4.3.2 page 80  says

"The initiator must be aware of the imminent completion of the SecurityNegotiation stage and MUST set the T bit to 1 and the NSG to what it would like the next stage to be. The target will answer with a Login response with the T bit set to 1 and the NSG to what it would like the next stage to be. The next stage selected will be the one the target selected. If the next stage is FullFeaturePhase, the target MUST respond with a Login Response with the Session ID and the protocol version."

The target can respond with NSG=1 when the initiator wants NSG=3.
In this case, the initiator has to terminate the connection if it
does not support OperationalParameterNegotiation.

-Sastry

Mike Donohoe wrote:

If the initiator send a login with T=1 csg,nsg= 0,3 can the target respond
with T=1 csg,nsg=0,1????

The text appropriate to this scenario is:

Section 4.3 Page 77

Stage transition is performed through a command exchange (request/
response) that carries the T bit and the same current stage code.
During this exchange, the next stage is selected by the target and
MUST NOT exceed the value stated by the initiator. The initiator can
request a transition whenever it is ready, but a target can respond
with a transition only after one is offered by the initiator.
...
When a transition is requested by the initiator and acknowledged by
the target both initiator and target switch to the selected stage.

The target isn't specifically "acknowledging" the original transition and
they had different "selected stages."

Thanks.

-- 
Subrahmanya Sastry K V
HCL Tech, Vadapalani, Chennai-26
Ph: +91-44-3728366  Xtn-1146
http://san.hcltech.com