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Chapter 2
Cisco CMTS Configuration Commands
cable upstream unfrag-slot-jitter
To control how much jitter can be tolerated on the corresponding upstream due to unfragmentable slots,
use the cable upstream unfrag-slot-jitter command in cable interface configuration mode. To disallow
all jitter, use the no form of this command.
Syntax Description
n
limit jitter
cac-enforce
Defaults
By default, the limit is 0 microseconds and the cac-enforce option is enabled.
Command Modes
Interface configuration (cable interface only)
Command History
Release
12.1(4)CX
12.2(4)BC1
Usage Guidelines
This command controls how much jitter due to unfragmented slots is to be tolerated on each port. If the
specified value for the tolerated limit is less than the size of a maximum unfragmentable slot, the MAC
scheduler automatically blocks the slots in the scheduling table so that the unfragmentable slot can be
accommodated in the blocked space and avoid causing excessive jitter to CBR slots.
The cac-enforce option enforces the rule that service flows requesting run-time jitter less than
unfragmentable slot jitter should be rejected.
Examples
The following example shows the jitter being set to 10 milliseconds (10,000 microseconds) for upstream
port 0 on cable interface 2/0:
Router# configure terminal
Router(config)# interface c2/0
Router(config-if)# cable upstream 0 unfrag-slot-jitter limit 10000
Router(config-if)#
OL-1581-08
cable upstream n unfrag-slot-jitter [limit jitter | cac-enforce]
no cable upstream n unfrag-slot-jitter [limit jitter | cac-enforce]
Specifies the upstream port number. Valid values start with 0 for the first
upstream port on the cable interface line card.
Specifies the allowable jitter limit caused by unfragmentable slots, in
microseconds (0 to 4,294,967,295).
Rejects service flows requesting jitter less than the fragmentable slot jitter.
Modification
This command was introduced.
Support was added to the Release 12.2 BC train.
cable upstream unfrag-slot-jitter
Cisco Broadband Cable Command Reference Guide
2-357
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