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Chapter 37: Service Class Names

STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide

Sfid Dir Curr Sid Sched Prio MaxSusRate MaxBrst MinRsvRate Throughput

State Type bits/sec packets/sec

---- --- ------- ---- ------ ---- ---------- ------- ---------- ----------- -----------

1 US act 8192 BE 0 1000000 3044 0 80384 157

2 DS act 0 1 1000000 96000 87200 1004416 1652

CER# configure qos-sc name GoldDn max-tr-rate 10000000 dir 1

CER# configure qos-sc name GoldDn apply-update

CER# show cable modem qos-sc update-pending name GoldDn

Jul 16 13:18:20

MAC address

---------------

Since the command above shows no modems in its output, the update has completed.

CER# show cable modem qos 001d.cea4.ab7b

Sfid Dir Curr Sid Sched Prio MaxSusRate MaxBrst MinRsvRate Throughput

State Type bits/sec packets/sec

---- --- ------- ---- ------ ---- ---------- ------- ---------- ----------- -----------

1 US act 8192 BE 0 1000000 3044 0 129356 253

2 DS act 0 1 10000000 96000 87200 9752320 16040

The final command in this example confirms that modem 001d.cea4.ab7b is now allowed 10 MB of

downstream service.

DSCP Marking for Downstream Subscriber Traffic

The C4/c CMTS currently can mark the DSCP for upstream subscriber traffic but not for downstream. By extending this

capability to the downstream, a greater level of control over the prioritization of traffic is created. Since many CPE devices

are DSCP-aware, you can use the downstream DSCP to prioritize traffic within the customer premises.

If an application can specify a QoS parameter via a service class name, such as DSG, multicast QoS or PacketCable, it will be

able to perform the overwrite function. If PCMM is used to set up multicast flows that multiple gates for the same

multicast group (and therefore group flow) then they will use the same QoS parameters via the same SCN. The behavior is

unspecified if different SCNs are used for the same multicast flow, and is expected to be handled similarly to how other

QoS parameters for the multicast flow are handled.

Some CLI commands associated with using a service class to provision the DSCP overwrite function include:

configure qos-sc name <name> and-mask <value> or-mask <value>

configure cable dsg tunnel <0-4294967295> service-class-name <WORD>

configure cable multicast group-qos <1-65535> scn <WORD>

Arris C4C User Manual

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