Release 1.0
Configuring the CMTS
526360-001-00 Rev. B
MGBI
6-53
Specifying Downstream Queue Thresholds
If the BSR is running both a time critical application (such as Voice Over IP) and best
effort service, the
cable downstream threshold
command guarantees that the
downstream scheduler can only release bandwidth within a certain specified range to
the downstream channel. When a higher priority VOIP packet arrives, the VOIP
packet will move ahead of the previously queued downstream non-VOIP data. This
command allows an operator to configure "back pressure" parameters for various
applications. Use the
cable downstream threshold
command, in Interface
Configuration mode, to specify downstream channel upper and lower queue
thresholds, as follows:
MOT
(config-if)#
cable downstream
<
NUM
>
threshold
{
bytes
<
500-65535
>
<
500-65535
> |
pdu
<
16-256
> <
16-256
>}
where:
NUM
is
the downstream channel number.
bytes
uses the byte count as a threshold unit.
500-65535
specifies the upper byte threshold (default is 1000).
500-65535
specifies the lower byte threshold (default is 500).
pdu
uses the PDU count as a threshold unit.
16-256
specifies the upper PDU threshold (default is 32).
16-256
specifies the lower PDU threshold (default is 16).
Limiting Downstream Multicast Traffic
The BSR can be configured to limit the amount of multicast traffic (including
DVMRP or PIM) on a downstream channel. Limiting the amount of multicast traffic
allows an MSO to balance the bandwidth requirements of IP-based video streaming
services with other bandwidth critical services such as voice traffic or high-priority
business traffic. Multicast traffic rate limiting is achieved by creating a static
multicast downstream service flow and assigning the service flow to a service class.
Use the
cable multicast
command, in Global Configuration mode, to create a static
multicast downstream service flow and assign the service flow to a service class, as
follows:
MOT:7A
(config)#
cable multicast
<
A.B.C.D
> <
A.B.C.D
> [<
WORD
>]
where:
A.B.C.D
is the destination IP multicast address.
Summary of Contents for BSR 2000
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