DOCS-MCAST-MIB Table View

This object controls the QoS, PHS and encryption settings
for downstream forwarding of IP multicast sessions.
An IP multicast session is replicated to one
or more Downstream Channel Sets (DCSs), where each
DCS is either a single downstream channel or a downstream
bonding group of multiple channels. The CMTS determines
on which DCSs to replicate a multicast session
based on IP multicast membership reports ('joins')
or other vendor-specific static configuration.
          
The CmtsGrpCfg object allows for the configuration
of a range of sessions through the SrcPrefixAddr and
GrpPrefixAddr and SrcPrefixLen and GrpPrefixLen attributes.
          
The CmtsGrpCfg object allows for the configuration
of QoS, Encryption and PHS for multicast sessions. Cable
operators can specify configuration rules for
a range of multicast sessions through the tuple of
(SrcPrefixAddr,SrcPrefixLen, GrpPrefixAddr, GrpPrefixLen)
attributes in an entry. The QosConfigId attribute
identifies the QoS rule, the EncryptionConfigId
identifies the encryption rule and the PhsConfigId
identifies the PHS rule for a particular entry.
Even if an entry indicates a range of multicast sessions
the Encryption and PHS rules are applied on a per-session
basis. That is, a separate DSID is assigned
to an individual multicast session from a range of multicast
sessions identified by an entry in the CmtsGrpCfg
object and a PHS rule (indicated by the PhsCfgId)
is applied individually to each session which is
identified by the DSID assigned for that session. Similarly,
a separate SAID is assigned to individual multicast
session from range identified by the CmtsGrpCfg
object.
The CmtsGrpQosConfigQosCtrl attribute from the CmtsGrpQosCfg
object is used to determine if the traffic
for a range of multicast sessions identified by an
entry in the CmtsGrpCfg object will be transmitted in
an 'Aggregate-Session' Group Service Flow or will
be transmitted separately for each session using
'Single-Session' Group Service Flows.  Even if the range
of multicast sessions are transmitted on an 'Aggregate-Session'
Group Service Flow, the PHS and Encryption
rules are always applied individually to a multicast
session on a per-session DSID basis prior to
being transmitted on an 'Aggregate-Session' Group
Service Flow (GSF).
          
This object supports the creation and deletion of multiple
instances.
Creation of a new instance of this object requires the
following attributes to be set
RulePriority
PrefixAddrType
SrcPrefixAddr
SrcPrefixLen
GrpPrefixAddr
GrpPrefixLen
IpDsLow
IpDsHigh
IpDsMask

This object controls the configuration of the Security
Association (SA) and the encryption algorithm
used for multicast sessions.
This object supports the creation and deletion of instances.

This object controls the configuration of DSID-indexed
PHS for multicast sessions. Configuration of
PHS Rules via this table must not be based on the configuration
of a range of sessions, but must be configured
on a single multicast session.
Creation of multiple instances of this object require
the following attributes to be set:
PhsField
PhsMask
PhsSize

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

This object describes the replication of IP Multicast
sessions onto the different Downstream Channel
Sets of a CMTS.  Each DCS may be either a single downstream
channel or a bonding group of multiple downstream
channels. Each IP Multicast session is identified
by a combination of IP source and IP Destination group
address '(S,G).  The CMTS replicates each IP packet
in an (S,G) session onto one or more Downstream Channel
Sets (DCSs), each of which is implemented in a MAC
Domain.  The CMTS assigns each replication a Downstream
Service ID (DSID) that is unique per MAC Domain.

This object reports the set of DSID-Indexed PHS rules
that are signaled between the CMTS and CMs as part
of the  Multicast Sessions setup. The attributes PhsMask,
PhsSize and PhsVerify comes from the configuration
object CmtsGrpPhsCfg. The value of the PhsField
attribute is derived by the CMTS from the CmtsGrpCfg
object parameters, and possibly other IP header informaton
of the multicast session that the CMTS is capable
of knowning prior to the multicast session setup.
In cases where the PhsSize is longer than the CMTS
knowledge of IP/TCP header fields, the CMTS extends
the PhsMask with bits set to  0  until reaching the equivalent
PhsSize value.

The table contains statistics for the IP multicast session
identified by the combination of IP source and IP destination
group address (S,G).

The table contains CPE information for the IP multicast session
identified by the combination of IP source and IP destination
group address (S,G), MAC Domain interface and CM MAC address.

The table contains the admitted aggregate bandwidth of IP
Multicast sessions onto the different Downstream Channel
Sets or MAC Domain Interfaces of a CMTS.