| Sun Ethernet Fabric Operating System CLI Base Reference Manual
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DCB |
DCB is a term commonly used to describe Ethernet enhancements to improve Ethernet networking and management in the data center environments. The DCB framework defines these enhancements required for switches and endpoints and includes the following features:
Also known as Enhancement Transmission Selection ETS (IEEE definition). The priority grouping specification provides bandwidth management and a scheduling algorithm for various traffic classes on a converged link.
- Priority-based Flow Control (PFC)
PFC is an enhancement to the existing Ethernet pause protocol. This feature allows "no-drop" packet delivery for certain traffic classes.
The DCB features are discovered and exchanged using Data Center Exchange Protocol (DCBX). DCBX uses LLDP (Link Layer Discovery Protocol) to exchange parameters between two DCB enabled link peers. In addition to the type, length, and value (TLV) attributes described in the LLDP chapter, DCBX TLVs can also be advertised over an LLDP enabled link to the peer. The DCBX capabilities (PG and PFC) exchanged with a link partner become the operational configuration and are passed to the QoS management subsystem for configuring the hardware.
The SEFOS DCB for this release supports DCB version 1.0.1 which was specified by the DCB Task Group.
16.0.1 Priority Group Feature (PG)
The purpose of PG (ETS) is to allocate link bandwidth based on the priority group setting on a link. Different traffic types may have different network bandwidth requirements. For example, priority 7 can be assigned to a priority group that does not require a bandwidth limitation.
16.0.2 Priority Flow Control Feature (PFC)
This PFC feature is important to provide "no-drop" packet delivery for certain traffic classes while maintaining existing LAN behavior for other traffic classes on a converged link. Priority 3 is enabled by default for the flow control. To efficiently use the switch resources, the switch allows up to two priorities for Ethernet priority pause. The Ethernet pause is applied to the PFC packets only.
16.0.3 Application Protocol Feature
This application protocol feature allows the DCB node to advertise the upper layer protocols and associated priority mapping over a DCB link. Since SEFOS switch is only a DCB capable switch and it is not a FCoE capable switch, the only protocol supported is the EtherType for layer 2 protocols. Its main purpose is to advertise its capability to the link partner which is a CNA (converged network adapter) port and the host runs FCoE over this CNA link. The priority mapping is taken from what the PFC feature is configured.
The following table shows the default setting for PG, PFC and Application.
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Priority
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Priority Group
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PG Bandwidth Allocation (%)
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Priority Flow Control
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Application Priority Mapping
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0
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0
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50
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disable
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disable
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1
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0
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50
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disable
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disable
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2
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0
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50
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disable
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disable
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3
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1
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30
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disable
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disable
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4
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2
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20
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disable
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disable
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5
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2
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20
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disable
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disable
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6
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2
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20
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disable
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disable
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7
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15
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unrestricted
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disable
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disable
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16.1 DCB Commands
The list of DCB commands is as follows:
16.1.1 shutdown dcb
Shutdowns DCB in the switch. The no form of this command starts DCB in the switch.
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Mode
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Global Configuration
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Default
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DCB is shutdown.
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Example
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SEFOS(config)# no shutdown dcb
SEFOS(config)# shutdown dcb
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Notes
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For DCB features to be advertised, LLDP must be started and enabled.
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16.1.2 set dcb {enable | disable}
Enables and disables the DCB feature on a specific interface.
set dcb {enable | disable}
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Syntax Description
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enable - Enables DCB on the port.
disable - Disables DCB on the port.
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Mode
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Interface Configuration
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Default
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Disabled.
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Example
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SEFOS(config)# interface extreme-ethernet 0/18
SEFOS(config-if)# set dcb enable
SEFOS(config-if)# set dcb disable
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Notes
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DCB must be enabled before any of the DCB features can be advertised.
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16.1.3 set dcb priority-group {enable | disable}
Enables and disables the priority group feature on the port.
set dcb priority-group {enable | disable}
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Syntax Description
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enable - Enables PG on the port.
disable - Disables PG on the port.
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Mode
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Interface Configuration
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Default
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Enabled.
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Example
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SEFOS(config)# interface extreme-ethernet 0/18
SEFOS(config-if)# set dcb priority-group enable
SEFOS(config-if)# set dcb priority-group disable
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Notes
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PG must be enabled for using the priority group feature.
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16.1.4 set dcb priority-group mode
Configures the PG mode for the port.
set dcb priority-group mode {auto | on | off}
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Syntax Description
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auto - Feature on after PG DCBX protocols are exchanged.
on - Force-enable the PG.
off - PG feature is off.
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Mode
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Interface Configuration
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Default
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auto
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Example
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SEFOS(config)# interface extreme-ethernet 0/18
SEFOS(config-if)# set dcb priority-group mode auto
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Notes
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In normal operation, this command is not required to run since its default is auto.
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16.1.5 set dcb priority-group
Sets the priority grouping identifier for eight priorities and priority group percentage of link bandwidth.
set dcb priority-group priority0-pgid_0-15 priority1-pgid_0-15 priority2-pgid_0-15 priority3-pgid_0-15 priority4-pgid_0-15 priority5-pgid_0-15 priority6-pgid_0-15 priority7-pgid_0-15 bandwidth prioritygroup0-bw_0-100 prioritygroup1-bw_0-100 prioritygroup2-bw_0-100 prioritygroup3-bw_0-100 prioritygroup4-bw_0-100 prioritygroup5-bw_0-100 prioritygroup6-bw_0-100 prioritygroup7-bw_0-100
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Syntax Description
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priority0-pgid_0-15 - Priority group ID of priority 0.
priority1-pgid_0-15 - Priority group ID of priority 1.
priority2-pgid_0-15 - Priority group ID of priority 2.
priority3-pgid_0-15 - Priority group ID of priority 3.
priority4-pgid_0-15 - Priority group ID of priority 4.
priority5-pgid_0-15 - Priority group ID of priority 5.
priority6-pgid_0-15 - Priority group ID of priority 6.
priority7-pgid_0-15 - Priority group ID of priority 7.
Bandwidth - Percentage of link bandwidth. Total bandwidth must be added up to 100%.
prioritygroup0-bw_0-100 - Percentage of link bandwidth allocated to PG 0.
prioritygroup1-bw_0-100 - Percentage of link bandwidth allocated to PG 1.
prioritygroup2-bw_0-100 - Percentage of link bandwidth allocated to PG 2.
prioritygroup3-bw_0-100 - Percentage of link bandwidth allocated to PG 3.
prioritygroup4-bw_0-100 - Percentage of link bandwidth allocated to PG 4.
prioritygroup5-bw_0-100 - Percentage of link bandwidth allocated to PG 5.
prioritygroup6-bw_0-100 - Percentage of link bandwidth allocated to PG 6.
prioritygroup7-bw_0-100 - Percentage of link bandwidth allocated to PG 7.
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Mode
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Interface Configuration
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Default
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Four priority groups are defined as default:
priority 0, 1, 2 - PG group 0.
priority 3 - PG group 1.
priority 4, 5, 6 - PG group 2.
priority 7 - PG group 15 (no limit on bandwidth).
Bandwidth:
priority group 0 - 50%.
priority group 1 - 30%.
priority group 2 - 20%.
priority group 15 - Unrestricted priority group.
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Example
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SEFOS(config)# interface extreme-ethernet 0/18
SEFOS(config-if)# set dcb priority-group 0 0 0 1 2 2 2 2
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Notes
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- The priority group ID values from 0 to 7 can be used for groups which require bandwidth allocation. Priority group 15 is used for unrestricted group.
- The priority group ID assigned must be entered in sequence except group ID 15 which is an unrestricted group. For example, the assignment of "1 0 0 0 0 0 0 2" is not allowed.
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16.1.6 set dcb priority-flow-control {enable | disable}
Enables and disables the priority flow control feature on the port.
set dcb priority-flow-control {enable | disable}
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Syntax Description
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enable - Enables PFC on the port.
disable - Disables PFC on the port.
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Mode
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Interface Configuration
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Default
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Disabled.
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Example
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SEFOS(config)# interface extreme-ethernet 0/18
SEFOS(config-if)# set dcb priority-flow-control enable
SEFOS(config-if)# set dcb priority-flow-control disable
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Notes
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PFC must be enabled for using the priority flow control feature.
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16.1.7 set dcb priority-flow-control mode
Configures PFC mode for the port.
set dcb priority-flow-control mode {auto | on | off}
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Syntax Description
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auto - Feature on after PG DCBX protocols are exchanged.
on - Force-enable the PFC feature.
off - PFC feature is off.
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Mode
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Interface Configuration
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Default
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auto
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Example
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SEFOS(config)# interface extreme-ethernet 0/18
SEFOS(config-if)# set dcb priority-flow-control mode auto
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Notes
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In normal operation, this command is not required to run because its default is auto.
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16.1.8 set dcb priority-flow-control vlan-priority
Configures the priority flow control.
set dcb priority-flow-control vlan-priority priority_0-1 priority_0-1 priority_0-1 priority_0-1 priority_0-1 priority_0-1 priority_0-1 priority_0-1
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Syntax Description
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Vlan-priority - VLAN priority to be priority flow control.
priority_0-1:
- 0 - No priority flow control.
- 1 - Enables the priority pause.
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Default
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vlan priority 3
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Example
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SEFOS(config)# interface extreme-ethernet 0/18
SEFOS(config-if)# set dcb priority-flow-control vlan-priority 0 0 0 1 0 0 0 0
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Notes
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In normal operation, this command is not required since the default is priority 3.
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16.1.9 set dcb application-etype-fcoe
Enables and disables the layer 2 Ethertype for FcoE protocol.
set dcb application-etype-fcoe {enable | disable}
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Mode
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Interface Configuration
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Default
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Enabled.
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Example
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SEFOS(config)# interface extreme-ethernet 0/18
SEFOS(config-if)# set dcb application-etype-fcoe enable
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Notes
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This command is mainly used when the switch port is connected to a host CNA (Converged Network Adapter) port which is capable of running FCoE (Fiber channel over Ethernet) and the host interface is configured to run FCoE.
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16.1.10 lldp tlv-select dcb1tlv
Configures DCBX TLV (type, length, value) types to be transmitted on a port. The no form of the command disables the transmission of DCBX TLV types on a port.
lldp tlv-select dcb1tlv {[priority-group] [priority-flow-control] [application-etype-fcoe]}
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no lldp tlv-select dcb1tlv {[priority-group] [priority-flow-control] [application-etype-fcoe]}
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Syntax Description
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priority-group - PG TLV.
priority-flow-control - PFC TLV.
application-etype-fcoe - Application TLV.
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Mode
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Interface Configuration
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Default
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All three TVLs are enabled.
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Example
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SEFOS(config)# interface extreme-ethernet 0/18
SEFOS(config-if)# lldp tlv-select dcb1tlv priority-group priority-flow-control application-etype-fcoe
SEFOS(config-if)# no lldp tlv-select dcb1tlv priority-group priority-flow-control application-etype-fcoe
SEFOS(config-if)# no lldp tlv-select dcb1tlv application-etype-fcoe
SEFOS(config-if)# lldp tlv-select dcb1tlv priority-flow-control
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Notes
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Currently, all three DCB TLVs must be entered in order as shown in the above example. The first TLV is priority-group and followed by priority-flow-control and application-etype-fcoe.
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- show lldp - Displays LLDP Global Configuration details
- show lldp neighbors - Displays information about neighbors learned on an interface or all interfaces
16.1.11 show dcb global info
Displays DCB Global Configuration.
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Mode
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Privileged EXEC
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Example
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SEFOS# show dcb global info
DCB Global Information
----------------------
System Control : Start
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16.1.12 show interfaces dcb priority-group
Displays configuration and status of priority group feature on an interface or all interfaces.
show interfaces [interface-type interface-id] dcb priority-group [detail]
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Syntax Description
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interface-type - Interface type.
interface-id - Interface identifier.
detail - Display the following configuration and status: Local configuration of PG, operational status of PG, and peer configuration of PG. Without the detail key word, this command displays the local PG configuration only.
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Mode
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Privileged EXEC
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Example
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SEFOS# show interfaces extreme-ethernet 0/18 dcb priority-group detail
Port : Ex0/18
Show Type : Admin Config
Feature : Priority Group
Enable : true
Advertise : false
Willing : false
Group Bandwidth : 50% 30% 20% 0% 0% 0% 0% 0%
Priority Group ID: 0 0 0 1 2 2 2 15
Max Traffic Class: 8
Show Type : Oper Config
Feature : Priority Group
Oper Version : 0
Max Version : 0
Errors : 0x0 - none
Operational Mode : true
Syncd with Peer : true
Group Bandwidth : 50% 30% 20% 0% 0% 0% 0% 0%
Priority Group ID: 0 0 0 1 2 2 2 15
Max Traffic Class: 8
Show Type : Peer Config
Feature : Priority Group
Local Interface : Ex0/18
Status : successful
Enable : true
Willing : true
Group Bandwidth : 50% 30% 20% 0% 0% 0% 0% 0%
Priority Group ID: 0 0 0 1 1 2 2 15
Max Traffic Class: 8
------------------------------------------------------------
Total Entries Displayed : 1
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The operational and peer configurations will not be displayed if "detail" keyword is omitted as shown below.
SEFOS# show interfaces extreme-ethernet 0/18 dcb priority-group
Port : Ex0/18
Show Type : Admin Config
Feature : Priority Group
Enable : true
Advertise : true
Willing : false
Group Bandwidth : 50% 30% 20% 0% 0% 0% 0% 0%
Priority Group ID: 0 0 0 1 1 2 2 15
Max Traffic Class: 8
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The peer configuration will not be shown if the interface is connected to a non-DCB capable peer as shown below.
SEFOS# show interfaces extreme-ethernet 0/19 dcb priority-group detail
Port : Ex0/19
Show Type : Admin Config
Feature : Priority Group
Enable : true
Advertise : true
Willing : false
Group Bandwidth : 50% 30% 20% 0% 0% 0% 0% 0%
Priority Group ID: 0 0 0 1 2 2 2 15
Max Traffic Class: 8
Show Type : Oper Config
Feature : Priority Group
Oper Version : 0
Max Version : 0
Errors : 0x0 - none
Operational Mode : false
Syncd with Peer : false
Group Bandwidth : 0% 0% 0% 0% 0% 0% 0% 0%
Priority Group ID: 0 0 0 0 0 0 0 0
Max Traffic Class: 8
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16.1.13 show interfaces dcb priority-flow-control
Displays configuration and status of priority flow control feature on an interface or all interfaces.
show interfaces [interface-type interface-id] dcb priority-flow-control [detail]
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Syntax Description
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interface-type - Interface type.
interface-id - Interface identifier.
detail - Display the following configuration and status: Local configuration of PFC, operational status of PFC, and peer configuration of PFC. Without the detail key word, this command displays the local PFC configuration only.
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Mode
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Privileged EXEC
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Example
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SEFOS# show interfaces extreme-ethernet 0/18 dcb priority-flow-control detail
Port : Ex0/18
Show Type : Admin Config
Feature : Priority Flow Control
Enable : true
Advertise : false
Willing : false
Priority Mask : 0 0 0 1 0 0 0 0
Max Traffic Class: 8
Show Type : Oper Config
Feature : Priority Flow Control
Oper Version : 0
Max Version : 0
Errors : 0x0 - none
Operational Mode : true
Syncd with Peer : true
Priority Mask : 0 0 0 1 0 0 0 0
Max Traffic Class: 8
Show Type : Peer Config
Feature : Priority Flow Control
Local Interface : Ex0/18
Status : successful
Enable : true
Willing : true
Priority Mask : 0 0 0 1 0 0 0 0
Max Traffic Class: 8
------------------------------------------------------------
Total Entries Displayed : 1
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The operational and peer configurations will not be displayed if "detail" keyword is omitted as shown below.
SEFOS# show interfaces extreme-ethernet 0/18 dcb priority-group
Port : Ex0/18
Show Type : Admin Config
Feature : Priority Group
Enable : true
Advertise : true
Willing : false
Group Bandwidth : 50% 30% 20% 0% 0% 0% 0% 0%
Priority Group ID: 0 0 0 1 1 2 2 15
Max Traffic Class: 8
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The peer configuration will not be shown if the interface is connected to a non-DCB capable peer as shown below.
SEFOS# show interfaces extreme-ethernet 0/19 dcb priority-flow-control detail
Port : Ex0/19
Show Type : Admin Config
Feature : Priority Flow Control
Enable : true
Advertise : true
Willing : false
Priority Mask : 0 0 0 1 0 0 0 0
Max Traffic Class: 8
Show Type : Oper Config
Feature : Priority Flow Control
Oper Version : 0
Max Version : 0
Errors : 0x0 - none
Operational Mode : false
Syncd with Peer : false
Priority Mask : 0 0 0 0 0 0 0 0
Max Traffic Class: 8
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16.1.14 show interfaces dcb application-etype-fcoe
Displays configuration and status of priority flow control feature on an interface or all interfaces.
show interfaces [interface-type interface-id] dcb application-etype-fcoe [detail]
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Syntax Description
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interface-type - Interface type.
interface-id - Interface identifier.
detail - Display the following configuration and status: Local configuration of application feature, and peer configuration of application feature. Without the detail key word, this command displays the local application configuration only.
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Mode
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Interface Configuration
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Example
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SEFOS# show interfaces extreme-ethernet 0/18 dcb application-etype-fcoe detail
Port : Ex0/18
Show Type : Admin Config
Feature : Application FCoE
Enable : true
Advertise : false
Willing : false
Priority Map : 0 0 0 1 0 0 0 0
Show Type : Oper Config
Feature : Application FCoE
Oper Version : 0
Max Version : 0
Errors : 0x0 - none
Operational Mode : true
Syncd with Peer : true
Priority Map : 0 0 0 1 0 0 0 0
Show Type : Peer Config
Feature : Application FCoE
Local Interface : Ex0/18
Status : successful
Enable : true
Willing : true
Priority Map : 0 0 0 1 0 0 0 0
------------------------------------------------------------
Total Entries Displayed : 1
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The operational and peer configurations will not be displayed if "detail" keyword is omitted as shown below.
SEFOS# show interfaces extreme-ethernet 0/18 dcb application-etype-fcoe
Port : Ex0/18
Show Type : Admin Config
Feature : Application FCoE
Enable : true
Advertise : true
Willing : false
Priority Map : 0 0 0 1 0 0 0 0
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The peer configuration will not be shown if the interface is connected to a non-DCB capable peer as shown below.
SEFOS# show interfaces extreme-ethernet 0/19 dcb application-etype-fcoe detail
Port : Ex0/19
Show Type : Admin Config
Feature : Application FCoE
Enable : true
Advertise : true
Willing : false
Priority Map : 0 0 0 1 0 0 0 0
Show Type : Oper Config
Feature : Application FCoE
Oper Version : 0
Max Version : 0
Errors : 0x0 - none
Operational Mode : false
Syncd with Peer : false
Priority Map : 0 0 0 0 0 0 0 0
Total Entries Displayed : 0
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Notes
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If application feature is enabled, its priority mapping will be taken from the PFC setting since both PFC priority sets and the application priority mapping must have the same priority set. The default priority mapping is 0x08 (priority 3 is enabled for priority flow control).
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16.1.15 show interfaces dcb mode
Displays the DCB state and feature mode on all interfaces or on a specific interface.
show interfaces [interface-type interface-id] dcb mode
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Syntax Description
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interface-type - Interface type.
interface-id - Interface identifier.
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Mode
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Privileged EXEC
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Example
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SEFOS# show interfaces extreme-ethernet 0/18 dcb mode
Port : Ex0/18
Show Type : Admin State
DCB Capable State : on
Priority Group : auto
Priority Flow Control : auto
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16.1.16 show interfaces dcb counters
Displays the DCB control and counters on all interfaces or on a specific interface.
show interfaces [interface-type interface-id] dcb counters
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Syntax Description
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interface-type - Interface type.
interface-id - Interface identifier.
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Mode
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Privileged EXEC
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Example
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SEFOS# show interfaces extreme-ethernet 0/18 dcb counters
Port : Ex0/18
Show Type : Control and Feature Stats
Control Info Stats :
SeqNo : 1
AckNo : 1
Frames Out : 1
Frames In : 2
Priority Group :
Frames Out : 1
Frames In : 2
Priority Flow Control:
Frames Out : 1
Frames In : 2
Application Proto :
Frames Out : 1
Frames In : 2
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If the interface is not yet connected to a DCB capable peer, no DCB packets will be received by the interface as shown below.
SEFOS# show interfaces extreme-ethernet 0/19 dcb counters
Port : Ex0/19
Show Type : Control and Feature Stats
Control Info Stats :
SeqNo : 1
AckNo : 0
Frames Out : 1
Frames In : 0
Priority Group :
Frames Out : 1
Frames In : 0
Priority Flow Control:
Frames Out : 1
Frames In : 0
Application Proto :
Frames Out : 1
Frames In : 0
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If the interface is down, no DCB will be transmitted and received by the interface as shown below.
SEFOS# show interfaces extreme-ethernet 0/20 dcb counters
Port : Ex0/20
Show Type : Control and Feature Stats
Status : Link Down
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16.1.17 clear interfaces dcb counters
Clears the DCB control and counters on all interfaces or on a specific interface.
clear interfaces [interface-type interface-id] dcb counters
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Syntax Description
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interface-type - Interface type.
interface-id - Interface identifier.
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Mode
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Privileged EXEC
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Example
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SEFOS# clear interfaces extreme-ethernet 0/18 dcb counters
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| Sun Ethernet Fabric Operating System CLI Base Reference Manual
|
E26513-03
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