Overview of service ingress policy on 7210 SAS-K
Page 236 7210 SAS D, E, K OS Quality of Service Guide
only DSCP bits for SAP ingress classification. This typically allows for efficient use of
available hardware resources and better scaling. SAP ingress policies that use only Dot1p
bits or only IPv4/IPv6 DSCP and Default SAP ingress QoS policies bits can use the
resources from chunks currently allocated for use by either IP-criteria or MAC-criteria or
IPv6 criteria. There are some special cases noted below for allocation of resources for
default, dot1p-only and dscp-only SAP ingress policies:
→ If there are no chunks available for accommodating a SAP that is associated with
default or dot1p-only or a dscp-only SAP ingress policy, the software allocates
resources against mac-criteria if the SAP is configured in a VLL or VPLS service. The
software uses the required number of entries for this policy. The remaining entries is
available for SAPs that use mac-criteria or that use only dot1p or only ipv4/ipv6
DSCP or that use default policy.
→ If there are no chunks available for accommodating a SAP that is associated with
default, dot1p-only or a dscp-only SAP ingress policy, the software allocates
resources against ipv4-criteria if the SAP is configured in an IES or a VPRN service.
The software uses the required number of entries for this policy. The remaining entries
is available for SAPs that use ipv4-criteria or that use only ipv4/ipv6 DSCP or only
dot1p criteria or that use default policy.
The SAP ingress resource chunks referred to in this section is different from the resources
specified using the command 'num-qos-classifiers'. num-qos-classifiers set the limit on the
resources needed per SAP ingress QoS policy. The above resources set the maximum limit on the
resources available for use by all the SAP ingress policies in use simultaneously on the system.
The software manages the resource chunks allocated to SAP ingress QoS policy pool and allocates
the entries in the chunks when a SAP ingress QoS policy is associated with a SAP. In other words,
a SAP specifies the amount of QoS resources it needs, using the 'num-qos-resources' CLI
command (in the SAP ingress policy) and the software allocates the resources required by a SAP
from the chunks depending on whether the SAP ingress policy uses ip-criteria or mac-criteria or
ipv6-criteria.
NOTE: In 7210 SAS-D, mac-criteria SAP ingress QoS policies get to use an additional 128
classification entries with 64 meters. These entries are allocated to mac-criteria SAP ingress QoS
resource pool by default and cannot be reassigned to any another feature or any other match
criteria.
The users can use “tools> dump> system-resources” command to know the current usage and
availability. One or more entries per chunk are reserved for system use.
Resource Allocation for Service Ingress QoS policy classification rules for
7210 SAS-K
The available global pool of ingress internal CAM hardware resources can be allocated as per user
needs for use with different features such as SAP ingress QoS policy, ingress ACLs, etc. SAP
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