Cisco uBR10-SRP-OC12SML Specifications download pdf (Page 183)

4-9

Cisco uBR10012 Universal Broadband Router Software Configuration Guide

OL-1520-05

Chapter4 Managing Cable Modems on the Hybrid Fiber-Coaxial Network

Configuring Maximum Hosts Attached to a CM

To configure the dynamic map advance algorithm, use the following command in cable interface

configuration mode.

Caution If you are adjusting the dynamic map-advance algorithm, do not reduce the safety factor below the

default value of 1000 usecs in a production network, until you are confident that the reduced safety

factor suffices for your deployment. The default value is chosen to be a safe operating point for the

algorithm.

Configuring Maximum Hosts Attached to a CM

To specify the maximum number of hosts that can be attached to a subscriber’s CM, use the following

command in cable interface configuration mode.

Configuring Per-Modem Filters

You can configure the CiscouBR10012router to filter incoming packets from individual hosts or

cableinterfaces based on the source Media Access Controller (MAC) or Internet Protocol (IP) address.

Definition of filters follows standard Cisco IOS configuration practices for access lists and groups.

Note Configuring per modem or host filters is supported in Cisco IOS Release 12.0(5)T1 or higher, as well

as in CiscoIOS Release 12.0(6)SC or higher.

Command Purpose

cable map-advance

dynamic [n]|static

Specifies a value to enhance the upstream throughput from a CM connected to

the CiscouBR10012router. The n argument provides the safety factor for the

dynamic map advance algorithm. This argument is specified in usecs and

controls the amount of extra lookahead time in MAPs to account for

inaccuracies of the measurement system and software latencies. The default

value is 1000 usecs.

You can vary this value from 500to1500usecs. This argument is a delta value

added to the dynamic map-advance setting that the algorithm computes.

Using larger safety factors increases the run-time lookahead in MAPs, but

reduces the upstream performance.

Use the static keyword for the cable map-advance command. The

CiscouBR10012router uses a fixed lookahead time in MAPs, regardless of the

real propagation delay of the farthest CM on the network. This fixed lookahead

time is computed based on the worst-case parameters, such as farthest DOCSIS

propagation delay for the CMs.

Command Purpose

cable max-hosts n

no cable max-hosts

Specifies the maximum number of hosts that can be attached to a CM on

this interface. Valid range is from 0 to 255 hosts. Default = 0.

Resets the allowable number of hosts attached to a CM to the default value

of 0 hosts.

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