Queue Sharing and Redirection
402 Quality of Service Guide
• The system decrements the queue ID association counter within the queue group
template for the queue ID previously specified in the forwarding class redirection.
• The system decrements the port queue group association counter for each egress port
queue group where the SAP egress QoS policy is applied to a SAP.
When a SAP ingress QoS policy with a forwarding class redirection to a queue group queue
ID is applied to a SAP:
• If the queue group specified in any forwarding class redirection does not exist as an
ingress port queue group on the port associated with the SAP, the SAP ingress QoS
policy application will fail.
If the operation above is successful, then:
• The system increments the port queue group association counter for each ingress port
queue group referenced in a forwarding class redirection on the port associated with
the SAP. The ingress port queue group association counter is incremented for each
forwarding class redirected to the queue group within the added policy.
When a SAP ingress QoS policy with a forwarding class redirection to a queue group queue
ID is removed from a SAP:
• If removing the SAP ingress QoS policy from the SAP results in the need to
instantiate an ingress queue for the SAP that cannot be created, the SAP ingress QoS
policy removal action will fail.
If the operation above is successful, then:
• The system decrements the port queue group association counter for each egress port
queue group referenced in a forwarding class redirection within the removed SAP
egress QoS policy. The egress port queue group association counter is decremented
for each forwarding class redirected to the queue group within the removed policy.
SAP-Based Provisioning Model
When a redirection to a named forwarding plane queue group instance is applied to a SAP on
ingress:
• If the queue group name does not exist as an ingress queue group template, the
redirection will fail.
• If a queue group name does exist as an ingress queue group template, but the
specified instance-id has not been instantiated on the same forwarding plane as used
by the SAP, the redirection will fail.
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