Command Line Interface Guide
Data Center Bridging Commands 887
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. Specifically, the willing parameter is disabled on
auto-downstream. 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. 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.
Configuration Source Port Selection Process
When an auto-upstream or auto-downstream port receives a configuration
from a peer, the DCBX client first checks if there is an active configuration
source. If there is a configuration source already selected, the received
2CSPC4.X8100-SWUM100.book Page 887 Wednesday, August 29, 2012 6:23 PM