Dell PowerConnect 8100 CLI Reference Guide - Page 876

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. 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 configuration is checked against the local port operational values as received from the configuration source, and if compatible, the client marks the port as operationally enabled. If the configuration received from the peer is determined to not be compatible, a message is logged, an error counter is incremented and the DCBX clients become operationally disabled on the port. The port continues to keep link up and exchanges DCBX packets. If a compatible configuration is later received, the DCBX clients will become operationally enabled. If there is no configuration source, a port may elect itself as the configuration source on a first-come, first-serve basis from the set of eligible ports. A port is eligible to become the configuration source if: • No other port is the configuration source. • The port role is auto-upstream. • The port is enabled with link up and DCBX enabled. • The port has negotiated a DCBX relationship with the partner. • The switch is capable of supporting the received configuration values, either directly or by translating the values into an equivalent configuration N.B. Whether or not the peer configuration is compatible with the configured values is NOT considered. The newly elected configuration source propagates DCBX client information to the other ports and is internally marked as being the port over which configuration has been received. Configuration changes received from the peer over the configuration source port are propagated to the other auto- 876 Data Center Bridging Commands