Cisco Systems uBR7200 Series Anleitung zur Fehlerbehebung PDF herunterladen (Seite 10)

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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide

78-5897-01

Chapter 4 Troubleshooting the System

Managing Cable Modems on the HFC Network

Verify Clear Cable Modem Counters

To verify whether or not the counters in the Station Maintenance List are cleared, enter the following

command. The station maintenance list counter will be 0.

Configure Traffic Shaping

Configure Downstream Rate Limiting and Shaping

To configure downstream rate limiting or shape downstream traffic, use the following command in cable

interface configuration mode.

Note Using Cisco IOS Release 12.0(5)T1 or higher, the software adds downstream calendar

queuing routines and grant shaping application of the calendar queues.

Key command usage is elaborated below:

• To enable rate limiting on the given downstream port using the token bucket policing algorithm,

issue the cable downstream rate-limit token-bucket command.

• To enable rate limiting on the given downstream port using the token bucket policing algorithm

with traffic shaping, issue the cable downstream rate-limit token-bucket shaping command.

• To enable rate limiting on the given downstream port using the token bucket policing algorithm

with a specific traffic shaping time granularity, issue the cable downstream rate-limit token-bucket

shaping granularity 8 command. Acceptable values are 1, 2, 4, 8, or 16 msecs.

• To enable rate limiting on the given downstream port using the token bucket policing algorithm

with a specific maximum traffic shaping buffering delay, issue the cable downstream rate-limit

token-bucket shaping granularity 8 command. Acceptable values are 128, 256, 512, or

1028 msecs.

• To remove rate limiting on the given downstream port, issue the cable downstream rate-limit

token-bucket command.

• To enable rate limiting on the given downstream port using a weighted packet discard policing

algorithm and to assign a weight for the exponential moving average of loss rate value, issue the

cable downstream rate-limit weighted-discard 3 command. Acceptable values are 1 to 4.

Configure Upstream Rate Limiting and Shaping

You can rate limit and shape traffic on a DOCSIS upstream channel. This delays the scheduling of the

upstream packet, which in turn causes the packet to be buffered on the cable CPE device, instead of

being dropped. This allows the user’s TCP/IP stack to pace the application traffic appropriately and

approach throughput commensurate with the subscriber’s defined QoS levels.

Table 4-11 Instructions to Conﬁgure Downstream Shaping

Command Purpose

CMTS01(config-if)#

[no]

cable downstream rate-limit

token-bucket

[shaping]

weighted-discard

[expwt <n>]

Enables or disables rate limiting and traffic

shaping on the downstream of a cable interface.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 57 58

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