Concept Guide

DCBx Error Messages
The following syslog messages appear when an error in DCBx operation occurs.
LLDP_MULTIPLE_PEER_DETECTED: DCBx is operationally disabled after detecting more than one DCBx
peer on the port interface.
LLDP_PEER_AGE_OUT: DCBx is disabled as a result of LLDP timing out on a DCBx peer interface.
DSM_DCBx_PEER_VERSION_CONFLICT: A local port expected to receive the IEEE, CIN, or CEE version
in a DCBx TLV from a remote peer but received a different, conflicting DCBx version.
DSM_DCBx_PFC_PARAMETERS_MATCH and DSM_DCBx_PFC_PARAMETERS_MISMATCH: A local DCBx port received
a compatible (match) or incompatible (mismatch) PFC configuration from a peer.
DSM_DCBx_ETS_PARAMETERS_MATCH and DSM_DCBx_ETS_PARAMETERS_MISMATCH: A local DCBx port received
a compatible (match) or incompatible (mismatch) ETS configuration from a peer.
LLDP_UNRECOGNISED_DCBx_TLV_RECEIVED: A local DCBx port received an unrecognized DCBx TLV from
a peer.
Debugging DCBx on an Interface
To enable DCBx debug traces for all or a specic control paths, use the following command.
• Enable DCBx debugging.
EXEC PRIVILEGE mode
debug DCBx {all | auto-detect-timer | config-exchng | fail | mgmt | resource | sem | tlv}
– all: enables all DCBx debugging operations.
– auto-detect-timer: enables traces for DCBx auto-detect timers.
– config-exchng: enables traces for DCBx conguration exchanges.
– fail: enables traces for DCBx failures.
– mgmt: enables traces for DCBx management frames.
– resource: enables traces for DCBx system resource frames.
– sem: enables traces for the DCBx state machine.
– tlv: enables traces for DCBx TLVs.
Verifying the DCB Conguration
To display DCB congurations, use the following show commands.
Table 21. Displaying DCB
Congurations
Command Output
show qos dot1p-queue mapping
Displays the current 802.1p priority-queue mapping.
show dcb [stack-unit unit-number]
Displays the data center bridging status, number of PFC-enabled
ports, and number of PFC-enabled queues. On the master switch in
a stack, you can specify a stack-unit number. The range is from 0 to
5.
show qos priority-groups
Displays the ETS priority groups congured on the switch, including
the 802.1p priority classes and ID of each group.
306 Data Center Bridging (DCB)