dscp (Input Congestion Notification)
Syntax
dscp {
code-point [code-point-bits] {
pfc {
mru mru-value;
}
xon (Input Congestion Notification)
}
}
Hierarchy Level
[edit class-of-service congestion-notification-profile name input]
Description
Configure a Differentiated Services code point (DSCP) value and apply priority-based flow control (PFC) to packets with that code point.
When this statement is configured, DSCP-based PFC can be invoked for untagged traffic by matching specified 6-bit DSCP values in the Layer 3 IP header of incoming packets instead of an IEEE 802.1p priority in the Layer 2 VLAN header. Additional configuration parameters associate configured DSCP values with a PFC priority to use in the Layer 2 pause frames sent to peers when the link becomes congested.
DSCP-based PFC can be used to support Remote Direct Memory Access (RDMA) over converged Ethernet version 2 (RoCEv2).
To enable DSCP-based PFC:
Use this statement to define a congestion notification profile to enable PFC on traffic specified by a DSCP value.
Use the
[edit class-of-service forwarding-classes class class-name] pfc-prioritystatement to map a lossless forwarding class to a PFC priority value to use in the PFC pause frames.Use the
[edit class-of-service classifiers] dscpstatement to set up a DSCP classifier for the desired DSCP value and forwarding class mapped to a PFC priority above.
The remaining statements are explained separately. Search for a statement in CLI Explorer or click a linked statement in the Syntax section for details.
Required Privilege Level
interface—To view this statement in the configuration.interface-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 17.4R1.