docs Mcast Cmts Group Qos Cfg Table

This object configures the QoS configured for Multicast sessions replicated to any Downstream Channel Set. It does not control which particular DCSs to which the CMTS replicates a multicast session. An instance in this object is called a GQC entry. A GQC entry controls how the CMTS instantiates a Group Classifier Rule (GCR) on the DCS to match packets of the multicast session. A Group Classifier Rule (GCR) uses source and destination IP address and ToS criteria. A GQC entry controls how and with what QoS parameters a Group Service Flow (GSF) is created on a DCS. All downstream multicast packets are scheduled on a GSF. The QoS Type attribute of the GQC entry controls whether the CMTS creates one GSF for each single IP multicast session or whether the CMTS creates one GSF for the aggregate of all sessions that match the GQC criteria. The GQC instance contains a reference to a Service Class from docsIetfQosServiceClassTable. The Service Class defines the list of QoS parameters for the GSF(s) instantiated for the GQC entry. A CMTS identifies one Service Class as the Default Group QoS Service Class. The CMTS instantiates a Default Group Service Flow on each single-channel DCS based on the parameters of the Default Group QoS Service Class. The set of GCRs and GSFs instantiated on a DCS control how QoS is provided to multicast packets replicated to the DCS. For each multicast packet, the CMTS classifies the packet to the highest priority matching GCR on that DCS. The GCR refers to a single GSF, which controls the scheduling of the packets on the DCS. If the multicast packet does not match any GCR on the DCS, the packet is scheduled on the Default Group Service Flow of the DCS. The CMTS replicates unclassified multicast traffic to only DCSs consisting of a single downstream channel. Thus, the Maximum Sustained Traffic Rate QoS parameter of the Default Group Service Class limits the aggregate rate of unclassified multicast traffic on each downstream channel. The CMTS is expected to instantiate GCRs and GSFs controlled by the entries in this table only for the duration of replication of the multicast sessions matching the entry. This object supports the creation of multiple instances. Creation of new instances of this object require the following objects to be set: ServiceClassName QosCtrl AggSessLimit