Cisco Cisco Access Registrar 4.2 Specifikace stáhnout pdf (Strana 376)

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Cisco Wireless LAN Controller Configuration Guide

OL-13826-01

Chapter 7 Controlling Lightweight Access Points

Dynamic Frequency Selection

Step 9 Enter these commands to re-enable the 802.11a and 802.11b/g networks:

config 802.11a enable network

config 802.11b enable network

Step 10 Send an email with your company name and the list of access points that have been migrated to this email

address: [email protected]. Cisco recommends that you cut and paste the output from the

show ap migrate command in Step 8 into the email.

Dynamic Frequency Selection

The Cisco UWN Solution complies with regulations that require radio devices to use dynamic frequency

selection (DFS) to detect radar signals and avoid interfering with them.

When a lightweight access point with a 5-GHz radio operates on one of the 15 channels listed in

Table 7-4, the controller to which the access point is associated automatically uses DFS to set the

operating frequency.

When you manually select a channel for DFS-enabled 5-GHz radios, the controller checks for radar

activity on the channel for 60 seconds. If there is no radar activity, the access point operates on the

channel you selected. If there is radar activity on the channel you selected, the controller automatically

selects a different channel, and after 30 minutes, the access point retries the channel you selected.

Note After radar has been detected on a DFS-enabled channel, it cannot be used for 30 minutes.

Note The Rogue Location Detection Protocol (RLDP) and rogue containment are not supported on the

channels listed in Table 7-4.

Note The maximum legal transmit power is greater for some 5-GHz channels than for others. When the

controller randomly selects a 5-GHz channel on which power is restricted, it automatically reduces

transmit power to comply with power limits for that channel.

Table 7-4 5-GHz Channels on Which DFS Is Automatically Enabled

52 (5260 MHz) 104 (5520 MHz) 124 (5620 MHz)

56 (5280 MHz) 108 (5540 MHz) 128 (5640 MHz)

60 (5300 MHz) 112 (5560 MHz) 132 (5660 MHz)

64 (5320 MHz) 116 (5580 MHz) 136 (5680 MHz)

100 (5500 MHz) 120 (5600 MHz) 140 (5700 MHz)

1 2 ... 371 372 373 374 375 376 377 378 379 380 381 ... 635 636

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