Cisco Cisco Access Registrar 4.2 Specifikace stáhnout pdf (Strana 461)

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Cisco Wireless LAN Controller Configuration Guide

OL-13826-01

Chapter 10 Configuring Radio Resource ManagementWireless Device Access

Configuring Dynamic RRM

The following non-configurable transmit power level parameter settings are also shown:

• Power Threshold—The cutoff signal level used by RRM when determining whether to reduce an

access point’s power. The default value for this parameter is -65 dBm but can be changed through

the controller CLI on rare occasions when access points are transmitting at higher (or lower) than

desired power levels. See the “Using the CLI to Configure Dynamic RRM” section on page 10-22

for the CLI command.

• Power Neighbor Count—The minimum number of neighbors an access point must have for the

transmit power control algorithm to run.

• Power Update Contribution—The factors used for changing power assignment levels: load (L),

signal (S), noise (N), or interference (I).

• Power Assignment Leader—The MAC address of the RF group leader, which is responsible for

power level assignment.

• Last Power Level Assignment—The last time RRM evaluated the current transmit power level

assignments.

Coverage Hole Algorithm

Coverage (3 to 50 dB) The maximum tolerable signal-to-noise ratio (SNR) level per client.

This value is used in the generation of traps for both the Coverage

Exception Level and Client Min Exception Level thresholds.

Default:12 dB (802.11b/g) or 16 dB (802.11a)

Client Min Exception Level

(1 to 75)

The minimum number of clients on an access point with a

signal-to-noise ratio (SNR) below the Coverage threshold. This

threshold works in conjunction with the Coverage and Coverage

Exception Level thresholds. A coverage exception is alerted if the

Coverage Exception Level percentage of clients (25%) and the Client

Min Exception Level number of clients (3) fall below the Coverage

threshold (12 dB). In this example, a coverage alarm would be

generated if at least 25% and a minimum of 3 clients have an SNR value

below 12 dB (802.11b/g) or 16 dB (802.11a).

Default:3

Profile Thresholds for Traps—Profile thresholds are used principally for alarming and have no

bearing on the functionality of the RRM algorithms. Lightweight access points send an SNMP trap (or

an alert) to the controller when the values set for these threshold parameters are exceeded.

Interference (0 to 100%) The percentage of interference (802.11 traffic from sources outside of

your wireless network) on a single access point.

Default: 10%

Clients (1 to 75) The number of clients on a single access point.

Default: 12

Noise (–127 to 0 dBm) The level of noise (non-802.11 traffic) on a single access point.

Default: –70 dBm

Utilization (0 to 100%) The percentage of RF bandwidth being used by a single access point.

Default: 80%

Table 10-1 RRM Parameters (continued)

Parameter Description

1 2 ... 456 457 458 459 460 461 462 463 464 465 466 ... 635 636

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