DELL 8132 ユーザーズマニュアル

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Data Center Bridging Commands
Port Roles
Each port’s behavior is dependent on the operational mode of that port and 
of other ports in the stack. The port mode is a DCBX configuration item that 
is passed to the DCBX clients to control the processing of their configuration 
information. There are four port roles:
Manual
Auto-Upstream
Auto-Downstream
Configuration Source
Manual
Ports operating in the Manual role do not have their configuration affected 
by peer devices or by internal propagation of configuration. These ports have 
their operational mode and TC and bandwidth information specified 
explicitly by the operator. These ports will advertise their configuration to 
their peer if DCBX is enabled on that port. Incompatible peer configurations 
will be logged and counted with an error counter.
The default operating mode for each port is Manual for PowerConnect 
releases; however, customer platforms may change the default mode for 
selected ports to either Auto-Upstream or Auto-Downstream mode. An 
example of this would be a blade switch that needed to support touchless 
configuration and has certain ports that are upstream ports and other ports 
that are downstream ports. A port that is set to manual mode sets the willing 
bit for DCBX client TLVs to false. Manually configured ports never internally 
propagate or accept internal or external configuration from other ports. 
Manually configured ports may notify the operator of incompatible 
configurations if client configuration exchange over DCBX is enabled. 
Manually configured ports are always operationally enabled for DCBX clients, 
regardless of whether DCBX is enabled.
Auto-Upstream
Advertises a configuration, but is also willing to accept a configuration from 
the link-partner and propagate it internally to the auto-downstream ports as 
well as receive configuration propagated internally by other auto-upstream 
ports. The local configuration parameters for PFC and ETS, if any, are 
2CSPC4.X8100-SWUM102.book  Page 874  Friday, March 15, 2013  8:56 AM