Cisco SR2016T-NA Reference Manual page 138

cable load-balance exclude
In particular, you must use the cable load-balance exclude command to exclude cable modems that
require specific upstream channels or downstream frequencies. Load balancing cannot be done when
cable modems are assigned specific channels or frequencies in their DOCSIS configuration files.
You can use the cable load-balance exclude command to specify that these cable modems should not
participate in the following types of load-balancing operations:
•
•
•
Use the cable load-balance exclude command to exclude a cable modem from any combination of load-
balancing operations.
are enabled for each form of the cable load-balance exclude command:
Table 2-4
Default
(no cable load-balance exclude)
cable load-balance exclude
cable load-balance exclude enforce Yes
cable load-balance exclude static
cable load-balance exclude strict
cable load-balance exclude static
strict
1. Dynamic load balancing must also be separately enabled for a load-balance group by using the enforce option with the
Excluding cable modems might be required for some cable modems that are not DOCSIS-compliant.
Note
Such cable modems can go offline for long periods of time when load balancing is attempted using
DOCSIS MAC messages. If this is the case, use the cable load-balance exclude command to exclude
such cable modems from load-balancing operations until the modem can be upgraded to DOCSIS-
compliant software.
Examples
The following example shows how to exclude a particular cable modem with the MAC address of
0001.0203.0405 from active and dynamic load-balancing operations:
Router# config terminal
Router(config)# cable load-balance exclude mac 0001.0203.0405
Cisco Broadband Cable Command Reference Guide
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Static load balancing—Load balancing is done at the time a cable modem registers by specifying the
proper target channel in the Downstream Frequency Override or an Upstream Channel ID Override
field in the registration response (REG-RSP) message that the Cisco CMTS sends to the cable
modem. This is the default form of registration-based load balancing.
Passive load balancing—Load balancing is done at the time a cable modem registers by ignoring a
cable modem's registration request (REG-REQ) message until it uses the correct target channels.
Use the cable load-balance exclude command to specify this form of load balancing for older cable
modems that do not respond well to the active form of load balancing.
Dynamic load balancing—A form of traffic-based load balancing, in which cable modems are
balanced among upstreams and downstreams after they come online, while they are passing traffic.
(Dynamic load balancing is enabled using the enforce option with the
threshold command.)
Table 2-4
cable load-balance exclude Command
load-balance group threshold command.
shows which forms of load-balancing operations are excluded and which
Static
Yes
Excluded
Excluded
Excluded
Excluded
Chapter 2 Cisco CMTS Configuration Commands
cable load-balance group
Passive Dynamic
Excluded Yes
Yes Excluded
Excluded Excluded
Yes Yes
Excluded Excluded
Excluded Yes
1
cable
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