Cisco Systems uBR7200 Verifying QoS Profiles, MC-583, Troubleshooting Tips, Command, Purpose

Configuring Headend Broadband Access Router Features

Configuring Cable Profiles

	Command		Purpose
Step 5
	CMTS01(config)# cable qos-profile groupnum		Sets the maximum upstream data rate in kbps that a
	max-upstream rate		cable modem using this QoS profile will send. Valid
			values are from 0 to 100000 kbps. Default = 0 (no
			upstream rate limit.)
Step 6
	CMTS01(config)# cable qos-profile groupnum		Sets the maximum downstream data rate in kbps that
	max-downstream rate		a cable modem using this QoS profile will receive.
			Valid values are from 0 to 100000 kbps. Default = 0
			(no downstream rate limit.)
Step 7
	CMTS01(config)# cable qos-profile groupnum priority		Assigns a relative priority number for the upstream
	number		traffic associated with this QoS profile. Valid values
			are from 0 to 7, with 7 being the highest priority.
			Default = 0.
Step 8
	CMTS01(config)# cable qos-profile groupnum		Overwrites the ToS byte in the IP datagrams received
	tos-overwrite value		on the upstream before forwarding them downstream.
			Sets the mask bits to a hexadecimal value to help the
			CMTS identify datagrams for QoS on the backbone.
	Note	You can use a single cable qos-profilecommand to configure multiple parameters for the
		selected QoS profile number.

Use the no cable qos-profilegroupnum command to remove an optional QoS profile, or in the case of QoS profiles 1 and 2, to return the parameters to their default values.

Verifying QoS Profiles

To verify whether or not a QoS profile has been created, and to see how it is configured, enter the show cable qos profile command:

CMTS01#	show	cable qos	profile
Service	Prio	Max	Guarantee	Max	Max tx	TOS	TOS	Create	B
class		upstream	upstream	downstream	burst	mask	value	by	priv
		bandwidth	bandwidth	bandwidth					enab
1	0	0	0	0	0	0x0	0x0	cmts	no
2	0	64000	0	1000000	0	0x0	0x0	cmts	no
3	0	1000	0	1000	0	0x0	0x0	cmts	no
4	7	2000000	100000	4000000	0	0x0	0x0	cm	yes

Troubleshooting Tips

To troubleshoot the configuration, perform the following tasks:

•Make sure you are in global configuration mode.

•Make sure you typed the correct QoS profile number and profile elements when you used the command.

•Note that cable modems that register continuously and fail consume more resources than cable modems that stay registered.

•Note that DOCSIS 1.0-certified cable modems that are given a short max-burst size may be unable to transmit large packets to the headend.

Cisco IOS Multiservice Applications Configuration Guide

MC-583