Reference Guide

Data Center Bridging Commands 893

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.

If the configuration is compatible with the configuration source, then the

DCBX client becomes operationally active on the upstream port.

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

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

2CSPC4.XModular-SWUM204.book Page 893 Friday, March 15, 2013 9:24 AM