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, and so on. SAP ingress QoS can be allocated classification for use from this pool. Resources can be allocated for SAP ingress QoS policy classification IPv4, IPv6, and MAC match criteria, based on the operator needs. Users can modify the resources allocated to scale the number of entries available per match criteria or scale the number of SAPs. The resources from the global ingress internal CAM pool are allocated in slices with a fixed number of entries.
The number of slices to be allotted for a SAP ingress QoS policy is specified using the config system resource-profile ingress-internal-tcam qos-sap-ingress-resource CLI command.
The user can specify a limit for the amount of resources required for SAP ingress QoS policies and also has the option to limit the amount of resources used per match criteria supported for SAP ingress QoS policies. A specific slice can be used for MAC criteria, IP criteria, and IPv6 criteria.
Before associating SAP-ingress policy match criteria with a SAP, resources must be allocated. Until resources are allocated for use, attempts to associate a policy with a SAP fail. When the user allocates resources for use by SAP ingress QoS policies using the config system resource-profile ingress-internal-tcam qos-sap-ingress-resource CLI command, the system allocates resources in slices of 510 entries (192 entries for the 7210 SAS-K 3SFP+ 8C).
The above resources set the maximum limit on the resources available for use by all SAP ingress policies in use simultaneously on the system. The software manages the resource slices allocated to the SAP ingress QoS policy pool and allocates the entries in the slices when a SAP ingress QoS policy is associated with a SAP. The software allocates the resources required by a SAP from the slices depending on whether the SAP-ingress policy uses IP criteria, IPv6 criteria, or MAC criteria, and the number of entries configured in the SAP-ingress policy.
When the user allocates slices of resources using the config system resource-profile ingress-internal-tcam qos-sap-ingress-resource CLI command, the resources are used only for classification entries configured under IPv4 criteria or MAC criteria.
If the user needs to use IPv6 criteria, resources must be allocated using the config system resource-profile ingress-internal-tcam qos-sap-ingress-resource mac-ipv4-ipv6-128-match-enable CLI command. The resources allocated using this command are used for classification entries configured under IPv6 criteria, IPv4 criteria, or MAC criteria. Each IPv6, IPv4, or MAC classification entry consumes two resources from this pool, reducing the number of classification entries that can be accommodated in a single slice to 256 (96 entries for the 7210 SAS-K 3SFP+ 8C.) The user can choose to allocate all the slices allocated for SAP ingress QoS classification for IPv6 criteria or allocate only a portion of it.
The tools dump system-resources CLI command displays the current usage and availability of the resources. One or more entries per slice are reserved for system use.