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Data Center Bridging Commands 875
overridden with the negotiated configuration. Specifically, the willing
parameter is enabled on the port and the recommendation TLV is sent to the
peer and processed if received locally. The first auto-upstream port to
successfully accept a compatible configuration becomes the configuration
source. The configuration source propagates its configuration to other auto-
upstream and auto-downstream ports. Only the configuration source may
propagate configuration to other ports internally. Auto-upstream ports that
receive internally propagated information ignore their local configuration and
utilize the internally propagated information.
Peer configurations received on auto-upstream ports other than the
configuration source result in one of two possibilities.
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
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 configuration 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 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
2CSPC4.X8100-SWUM102.book Page 875 Friday, March 15, 2013 8:56 AM