Administrator Guide
• The peer times out.
• Multiple peers are detected on the link.
DCBx operations on a port are performed according to the auto-congured DCBx version, including fast and slow transmit timers
and message formats. If a DCBx frame with a dierent version is received, a syslog message is generated and the peer version is
recorded in the peer status table. If the frame cannot be processed, it is discarded and the discard counter is incremented.
DCBx Example
The following gure shows how DCBx is used on an Aggregator installed in a Dell PowerEdge M I/O Aggregator chassis in which
servers are also installed.
The external 40GbE ports on the base module (ports 33 and 37) of two switches are used for uplinks congured as DCBx auto-
upstream ports. The Aggregator is connected to third-party, top-of-rack (ToR) switches through 40GbE uplinks. The ToR switches
are part of a Fibre Channel storage network.
The internal ports (ports 1-32) connected to the 10GbE backplane are congured as auto-downstream ports.
On the Aggregator, PFC and ETS use DCBx to exchange link-level conguration with DCBx peer devices.
Figure 4. DCBx Sample Topology
Data Center Bridging (DCB)
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