Administrator Guide

Data Center Technology Commands 1154
1 If the configuration is compatible with the configuration source, then the
DCBX client becomes operationally active on the upstream port.
2 If the configuration is not compatible with the configuration source, then
a message is logged indicating an incompatible configuration, an error
counter is incremented, and the DCBX client is operationally disabled on
the port. The expectation is that the network administrator configures the
upstream devices appropriately so that all such devices advertise a
compatible configuration.
Auto-Downstream
An auto-downstream port advertises a configuration but is not willing to
accept one from the link partner. However, the port will accept a
configuration propagated internally by the configuration source. The local
operational parameters for PFC and ETS, if any, are overridden with the
negotiated configuration.Specifically, the willing parameter is disabled on
auto-downstream ports. By default, auto-downstream ports have the
recommendation TLV parameter enabled. Auto-downstream ports that
receive internally propagated information ignore their local configuration and
utilize the internally propagated operational information.
Configuration Source
In this role, the port has been manually selected to be the configuration
source. Configuration received over this port is propagated to the other auto-
configuration ports, however, no automatic election of a new configuration
source port is allowed. Only one port can be configured as the configuration
source. The local configuration parameters for PFC and ETS, if any, are
overridden with the received configuration. Events that cause selection of a
new configuration source are ignored. The configuration received over the
configuration source port is maintained until cleared by the operator (set the
port to the manual role). FIP snooping must be enabled to set a port to
configuration source. For interfaces configured in a port-channel for which it
is desirable to receive configuration information, it is strongly recommended
that the auto-up setting be used on the physical interfaces in the port channel
in preference to the configuration source parameter.
2CSNXXX_SWUM204.book Page 1154 Monday, January 25, 2016 1:25 PM