Full Classification Of Packets And Fabric Ingress Queueing; Egress Queues On The 40-Port Sfp+ Line Card - Juniper JUNOS OS 10.3 - SOFTWARE Manual

Egress Queues on the 40-port SFP+ Line Card

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Full Classification of Packets and Fabric Ingress Queueing

When the packets from a port group reach the Packet Forwarding Engine, it performs
full packet classification, along with other actions such as multifield (MF) classification,
traffic policing, and storm control. It then schedules and queues the packets for ingressing
the fabric. The fabric priority associated with the forwarding class determines whether
packets are sent to the low priority or high priority fabric ingress queues.
As with all EX Series switch interfaces, each interface on the 40-port SFP+ line card
supports eight egress CoS queues. You can map up to 16 forwarding classes to these
queues.
All interfaces in a port group also share a single set of eight egress chassis queues at the
Packet Forwarding Engine. Egress traffic is fanned out from the Packet Forwarding Engine
chassis queues to the corresponding queues for the individual ports. For this reason, the
interfaces in a port group must share the same scheduler map configuration. If you
configure different scheduler map configurations for the different interfaces in a port
group, an error is logged to the system log and the default scheduler map is used for the
ports in the port group.
Understanding Junos OS CoS Components for EX Series Switches on page 3148
Understanding CoS Schedulers on page 3160
Understanding CoS Forwarding Classes on page 3156
Example: Configuring CoS on EX Series Switches on page 3173
Configuring CoS Traffic Classification for Ingress Queuing on 40-port SFP+ Line Cards
(CLI Procedure) on page 3225
Chapter 107: Class of Service (CoS)—Overview
3171