Setup Guide

Table Of Contents
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 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 specific 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 configuration 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 Configuration
To display DCB configurations, use the following show commands.
Table 25. Displaying DCB Configurations
Command Output
show qos dot1p-queue mapping
Displays the current 802.1p priority-queue mapping.
Displays the data center bridging status, number of PFC-enabled
ports, and number of PFC-enabled queues.
show interface port-type pfc {summary | detail}
Displays the PFC configuration applied to ingress traffic on an
interface, including priorities and link delay.
To clear PFC TLV counters, use the clear pfc counters
interface port-type slot/port command.
show interface port-type pfc statistics
Displays counters for the PFC frames received and transmitted (by
dot1p priority class) on an interface.
You can use the show interface pfc statistics
command even without enabling DCB on the system.
260 Data Center Bridging (DCB)