Configuring Data Center Bridging

Default Data Center Bridging Configuration Settings lists the S- K- and 7100-Series device default Data Center Bridging configuration settings.

Default Data Center Bridging Configuration Settings

Parameter	Description	Default Value
Application Priority	Advertises to the LLDP peer a preferred priority for frames carrying application-specific traffic.	disabled on all ports
CN alternate priority	The priority a packet is mapped to if a non-CNPV packet ingresses a port set for domain defense mode edge (S-, 7100-Series).	relative to CNPV, either the next lower non-CNPV priority, if it exists, or the next higher.
CN transmit priority	The priority assigned to the CNM PDUs sent by the congestion point back to the reaction point when congestion is detected (S-, 7100-Series).	7
CNPV creation status	Specifies whether auto choice is enabled or disabled on the switch for the created congestion notification priority value (CNPV) (S-, 7100-Series).	enabled
CNPV status	Specifies whether a configured CNPV is activated (enable) or not activated (disable) on the switch (S-, 7100-Series).	activated (enable)
congestion notification domain defense mode	Determines whether the ingressing packet priority is remapped away from a configured CNPV value on the port and whether a CN-TAG can be added or removed from the packet (S-, 7100-Series).	Edge if port-priority choice is set to auto; Disabled if port-priority choice is set to admin; Determined by the default choice of the priority, if port-priority is set to default.
congestion notification global status	Specifies whether congestion notification is enabled globally on the switch (S-, 7100-Series).	enabled
congestion notification LLDP	Used to send LLDP CN TLVs for all CNPVs on the port. The actual sending of the TLVs is disabled by default (S-, 7100-Series).	enabled
congestion queue minimum sample	Specifies the minimum number of octets to enqueue in the congestion point queue between transmissions of CNM PDUs (S-, 7100-Series).	150000 octets
Enhanced Transmission Selection (ETS)	Provides for the designation of two or more traffic class queues to be allocated for bandwidth that will not be serviced until all non-ETS queues are empty.	No ETS class queues are configured
priority choice	Specifies the method for selecting domain defense on all device ports (7100-Series).	auto
Priority-based Flow Control (PFC)	Provides for flow control per hardware egress queue that the PFC priority is mapped to (S-, 7100-Series).	disabled on all ports

Data Center Bridging Configuration lists Data Center Bridging configuration commands.

Data Center Bridging Configuration

Task	Command
Optionally, map traffic classes to ETS groups in the CoS transmit queue port group configuration and specify the bandwidth allocation for the group.	set cos port-config txq group-type-index [name name] [enhanced-groups group-id] [enhanced-percentage bandwidth]
Optionally, enable priority-based flow control for a specified port and priority or modify the link delay allowance (7100-Series). It is not recommended that you modify the link delay allowance.	set dcb pfc port-string priority enable | link-delay-allowance bits}
Optionally, set the priority to be advertised to the peer of the specified port for the specified application.	set dcb appPri port-string protocol {ethertype | tcp | udp | l4port} protocol-id protocol-id priority priority
Set Data Center Bridging optional LLDP-DCB TLVs to be transmitted in LLDP PDUs by the specified port or ports.	set lldp port tx-tlv {[enhanced-trans-config] [enhanced-trans-rec] [application-pri] [priority-flowctrl] [congestion-notif]} port-string

Congestion Notification Global Configuration (S-, 7100-Series) lists Congestion Notification global configuration commands. All Congestion Notification commands can be entered from any command mode. (S-, 7100-Series)

Congestion Notification Global Configuration (S-, 7100-Series)

Task	Command
Globally enable congestion notification on the switch.	set dcb cn global enable
Optionally, modify the priority for Congestion Notification Messages sent from the congestion point back to the congestion notification reaction point.	set dcb cn global tx-priority tx-priority
Optionally, modify congestion point queue parameters for queues associated with a congestion point queue configuration or associate a congestion notification queue profile with the configuration.	set dcb cn congestion-point port-string cp-index [set-point set-point] [weight weight] [qp-index qp-index]
Optionally, modify congestion notification queue profile parameters associated with up to two queue profiles on the S- K- and 7100-Series device	set dcb cn q-profile qp-identifier [min-sample min-sample]

Congestion Notification Global Configuration (S-, 7100-Series) lists Congestion Notification global priority configuration commands. All Congestion Notification commands can be entered from any command mode. (S-, 7100-Series)

Congestion Notification Global Priority Configuration (S-, 7100-Series)

Task	Command
Configure up to seven 802.1p priorities as Congestion Notification Priority Value (CNPV) on the switch. Optionally, configure priority choice mode to admin using the creation disable option. Priority choice defaults to auto.	set dcb cn priority priority [creation {enable | disable}]
Activate configured CNPVs for all ports on the switch.	set dcb cn priority priority status enable
Optionally modify the priority choice mode on all device ports for the specified CNPV. Priority choice globally defaults to auto.	set dcb cn priority priority choice {admin | auto}
Optionally, modify the global default congestion notification alternate priority for the specified CNPV.	set dcb cn priority cnpv alt-priority alt-priority
Optionally, administratively configure a global default domain defense mode for all ports on the switch for the specified priority.	set dcb cn priority priority defense {disabled | edge | interior | interior-ready}
If using the default priority choice of auto, enable auto configuration of domain defense operation using LLDP.	set dcb cn priority priority lldp enable

Congestion Notification Port Priority Configuration lists Congestion Notification port priority configuration commands.

Congestion Notification Port Priority Configuration

Task	Command
Optionally, for all priorities, modify the default method for determining how the domain defense is selected for the specified port.	set dcb cn port-priority port-string choice {admin | auto | default}
Optionally modify the alternate priority for the specified port and CNPV.	set dcb cn port-priority port-string priority alt-priority alt-priority
Optionally, administratively modify the default domain defense mode for the specified priority on the specified port.	set dcb cn port-priority port-string priority defense {disabled | interior | interior-ready | edge}
If using the default priority choice of auto, enable auto configuration of domain defense operation using LLDP for a specific priority and port.	set dcb cn port-priority port-string priority lldp {enable | disable}
Optionally, set the method that determines how the domain defense is selected for the specified priority on the specified port.	set dcb cn port-priority port-string priority priority choice {admin | auto | default}

Data Center Bridging Display Commands lists Data Center Bridging display commands.

Data Center Bridging Display Commands

Task	Command
Display the ETS group CoS transmit queue port group mappings by the port group and type.	show cos port-config txq group-type-index
Display priority-based flow control table entries (7100-Series).	show dcb pfc [port-string][-interesting] [link-delay-allowance]
Display Application Priority table entries by port.	show dcb appPri port-string
Display LLDP port Data Center Bridging, priority-based flow control, Application Priority, or congestion notification transmit TLV support.	show lldp port tx-tlv [data-center-bridging] [priority-flowctrl] [application-pri] [congestion-notif]
Display the local or remote system information, including ETS information, stored for one or more ports.	show lldp port {local-info | remote-info} [port-string]
Display the global status of congestion notification on the switch (S-, 7100-Series).	show dcb cn global
Display the configuration and status of congestion notification priority values on the switch (S-, 7100-Series).	show dcb cn priority [priority] [-interesting]
Display congestion notification port level defense mode configuration (S-, 7100-Series).	show dcb cn port-priority [port-string [priority]] [priority priority] [-interesting]
Display the configuration and status of congestion notification congestion points (S-, 7100-Series).	show dcb cn congestion-point [port-string [cp-id]] [stats]
Display the congestion notification queue profile configuration stats (S-, 7100-Series).	show dcb cn q-profile [profile-id]

Refer to the S-, K-, and 7100 Series CLI Reference Guide for more information about each command.