Mellanox Technologies Mellanox SX1018 User Manual page 76

• Transmits PFC-PAUSE frames when the receive threshold for a particular traffic class is
reached
• Provides the management capability for an administrator to configure the flow control
properties on each port of the switch
• Keeps flow control disabled for all priorities on all ports by default
• Allows an administrator to enable or disable flow control per port and per priority level
• Supports flow control only on physical ports, not on logical interfaces such as tunnels or
interfaces defined by sharing a physical port in multiple virtual switch contexts
• Uses the configured threshold values to set up the queue buffer spaces accordingly in
the datapath
• Provides hardware abstraction layer callouts for the following:
• Enabling or disabling of flow control on each port for each priority
• Configuring the queue depth for each priority on each port
• Supports MIB defined in the 802.1Qbb standard and a proprietary MIB for management
• Provides trace logs for execution upon error conditions and for any event notifications
from the hardware or datapath. These trace logs are a useful aid in troubleshooting.
• Allows the administrator to configure the minimum and maximum threshold values for
flow control. These configurations are applied globally on all ports and priorities.
Priority Based Flow Control (PFC) provides an enhancement to the existing pause flow control
mechanism as described in 802.1X.
 To enable PFC globally:
Log in as admin.
Step 1.
Enter config mode. Run:
Step 2.
switch > enable
switch # configure terminal
Enable PFC globally on the switch. Run:
Step 3.
switch (config) # dcb priority-flow-control enable
This action might cause traffic loss while shutting down a port with priority-flow-con-
trol mode on
Type 'yes' to confirm enable pfc globally: yes
 To enable PFC per priority:
Log in as admin.
Step 1.
Enter config mode. Run:
Step 2.
switch > enable
switch # configure terminal
Enable PFC globally on the switch. Run:
Step 3.
switch (config) # dcb priority-flow-control enable
# dcb priority-flow-control enable
This action might cause traffic loss while shutting down a port with priority-flow-con-
trol mode on
Type 'yes' to confirm enable pfc globally: yes
switch (config) #
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