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Cisco Broadband Cable Command Reference Guide
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Chapter 2 Cisco CMTS Configuration Commands
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:
•
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
cable load-balance group
threshold
command.)
Use the
cable load-balance exclude
command to exclude a cable modem from any combination of load-
balancing operations.
Table 2-4
shows which forms of load-balancing operations are excluded and which
are enabled for each form of the
cable load-balance exclude
command:
Note
Excluding cable modems might be required for some cable modems that are not DOCSIS-compliant.
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
Table 2-4
cable load-balance exclude Command
Static Passive
Dynamic
1
1.
Dynamic load balancing must also be separately enabled for a load-balance group by using the
enforce
option with the
cable
load-balance group threshold
command.
Default
(
no cable load-balance exclude
)
Yes Excluded
Yes
cable load-balance exclude
Excluded Yes
Excluded
cable load-balance exclude enforce
Yes Excluded
Excluded
cable load-balance exclude static
Excluded
Yes
Yes
cable load-balance exclude strict
Excluded Excluded Excluded
cable load-balance exclude static
strict
Excluded Excluded Yes