DELL 8132 ユーザーズマニュアル

Data Center Bridging Commands

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.

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-

2CSPC4.X8100-SWUM102.book  Page 876  Friday, March 15, 2013  8:56 AM