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DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide
437
45-3 show interface priority-flow-control
This command is used to display Priority-based flow control information of interface.
show interface [INTERFACE-ID [, | -]] priority-flow-control
Parameters
Usage Guideline
Priority-based Flow Control (PFC), which is defined in the IEEE 802.1Qbb standard,
extends the basic IEEE 802.3x PAUSE semantics and uses the IEEE 802.1p CoS
values in the IEEE 802.1Q VLAN tag to differentiate up to eight CoSs that can be
subject to flow control independently.
The following is a procedure to enable PFC on a priority basis.
1. Use class-map type network-qos global configuration command to create a type
network-qos class map.
a. Use match cos class-map configuration command to specify which priorities you
want to configure.
2. Use policy map type network-qos to create a type network-qos policy map.
a. Use the class type network-qos policy-map configuration command to specify a
type network-qos class map to be associated with a traffic policy.
b. Use pause policy map type network-qos class configuration command to enable
PFC pause characteristics on a class referenced in a type network-qos policy map.
3. Use service-policy interface configuration command to apply a type network-qos
policy map.
If PFC of all priorities is disabled on an interface, the interface defaults to the IEEE
802.3x flow control setting. When PFC of any priority is enabled, the interface will
pause a CoS on which PFC is enabled and a pause frame for that CoS is received.
Meanwhile, a pause frame will be transmitted if the congestion is detected on the
PFC enabled CoS.
This command is used to turn on the Priority Flow Control (PFC) willing feature.
When enabled, the system will use Data Center Bridging Exchange (DCBX) to
detect remote systems and accept a PFC configuration from them.
You need enable the Switch to transmit LLDP DCBX PFC TLV to advertise the PFC
setting of per-CoS and negotiated with the peer to take the PFC willing (on) into
effect.
The Priority-based flow control configured applies to all member interfaces if the port
is member port of a Port group.
Example
This example shows how to turn on the DCBX PFC willing bit on interface 1/1/1.
DXS-3600-32S#configure terminal
DXS-3600-32S(config)#interface gigabitEthernet 1/1/1
DXS-3600-32S(config-if)# priority-flow-control willing
INTERFACE-ID (Optional) Specifies that a valid interface is a physical interface.
, (Optional) Specifies a series of interfaces, or separate a range of interfaces from a
previous range. No space before and after the comma.
- (Optional) Specifies a range of interfaces. No space before and after the hyphen.
Default
None.
Command Mode
EXEC Mode.
Command Default Level
Level: 3.
Usage Guideline
Use this command to display the PFC information on the specified interfaces.
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