Service Ingress QoS Policies
7210 SAS D, E, K OS Quality of Service Guide Page 239
Computation of SAP ingress classification and meter resources
used per SAP ingress policy for 7210 SAS-D and E
This section provides information on the resource consumption per SAP ingress policy. Resources
required by SAP ingress policy is allocated from the ingress-internal-tcam resource pool based on
the amount of resources allocated for SAP ingress classification.
The user is allowed to configure the number of classification entries the SAP requires (for
example: TQ).
Number of meters allocated automatically by system = TQ / 2 (up to a maximum of 32
meters).
To calculate the number of SAPs allowed, assume all configured to use ‘TQ’ QoS resources per
SAP.
Number of SAPs allowed = maximum classification entries / TQ.
NOTE: The number of SAPs arrived at using the equation above is subject to system limits. The
above equation is used to derive the limit on the number of SAPs due to QoS resources only.
The user is allowed to mix and match SAPs with different QoS resources (that is, using different
values of TQ). The allowed values in the 7210 SAS-E devices for the parameter num-qos-
classifiers are 16, 36, and 72. The allowed values in 7210 SAS-D devices for the parameter num-
qos-classifiers are 4,8,16,32,64,128 and 256. For 7210 SAS-E, when num-qos-resources is
configured with a value of 16, the system internally uses a value of 18.
The following determines the number of QoS resources to be allocated for an SAP:
• Number of match-criteria entries used to identify the FC.
• Number of FCs to use and number of traffic-types to be policed per FC.
• The amount of hardware classification resources needed per entry configured by the user
(refer to the section ""Resource Allocation for Service Ingress QoS policy classification
rules for 7210 SAS-D and E on page 241 to know about resources needed per match entry.
It varies based on different match criteria in use).
Only those FCs that are in use by the match-criteria classification entries are considered for the
number of FCs. Therefore, these FCs are referred to as ‘FC in use’.
Given the number of traffic types to use per 'FC in use', the following rules apply for a SAP in a
VPLS service to arrive at number of classification entries per FC in use:
• If a FC is in use and is created without explicit meters, use default meter #1 for unicast
traffic and for all other traffic types (that is, broadcast, multicast and unknown-unicast).
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