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Selectively discard traffic based on CoS priority with egress rate shaping on the EX-series Switch

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Article ID: KB12705 KB Last Updated: 05 Mar 2017Version: 4.0
Summary:
This article provides a summary view of how to discard traffic based on CoS priority with egress rate shaping on the EX-series Switch.  For greater detail please review the EX-series Switch documentation at the link provided.
Symptoms:

Solution:
Selectively discard traffic based on CoS priority with egress rate shaping on the EX-series Switch

We can combine scheduling and shaping to accomplish this.

EXAMPLE:

  • If you configure all 8 queues of a given port as Strict Priority queues and then shape the entire port to 70Mbps.
  • When we send 10Mbps into each of the 8 queues (so aggregate is 80Mbps) based on FC value that is classified at the switch ingress, the net shaping result would be that all q1-q7 traffic (totaling 70Mbps) will go through and all q0 traffic is dropped as q0 is served last after all other 7 queues are completely emptied out under Strict Priority scheduling scheme.
Similarly, if the shaping rate is configured to be 60Mbps, then q2-q7 traffic are all passed and q0-q1 traffic is dropped.

This scheme could be considered as a form of "selective discard based on CoS priority" when shaping rate is reached.

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