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Enabling 802.11n protection, Configuring 802.11n protection mode – H3C Technologies H3C MSR 50 User Manual

Page 40

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31

Feature

MSR 900 MSR 930 MSR

20-1X

MSR 20

MSR 30

MSR 50 MSR

2600

802.11n No

Available
for MSR
930

(WLAN &

HSPA+),
MSR 930

(WLAN &

EVDO),
and MSR

930

(WLAN)

Available
for routers
with a

SIC_WLA

N module
that

supports

802.11n

Available
for routers
with a

SIC_WLA

N module
that

supports

802.11n

Available
for routers
with a

SIC_WLA

N module
that

supports

802.11n

Available
for routers
with a

SIC_WLA

N module
that

supports

802.11n

Available
for routers
with a

SIC_WLA

N module
that

supports

802.11n

Enabling 802.11n protection

When both 802.11n and non 802.11n clients access a WLAN network, interference easily occurs. The

access rate is degraded significantly because they adopt different modulation modes. To enable both

802.11n and non-802.11n clients to operate correctly, enable 802.11n protection for an 802.11n device to
send RTS/CTS or CTS-to-self (the destination of the CTS packets is the device that sends them) packets to

non-802.11n devices, which then defer access to the medium.
The following cases require 802.11n protection to be enabled an 802.11n AP.

A non-802.11n client associates with the 802.11n AP. In this case, 802.11g protection is always
enabled without manual intervention.

The 802.11n AP detects a non-802.11n BSS or some 802.11n packets that are not destined to it. To
enable 802.11n protection, issue the dot11g protection enable command.

To enable 802.11n protection:

Step Command

Remarks

143.

Enter system view.

system-view

N/A

144.

Enter WLAN RRM view.

wlan rrm

N/A

145.

Enable 802.11n protection.

dot11n protection enable

Optional.
By default, 802.11n protection is

disabled.
Enabling 802.11n protection
reduces network performance.

Configuring 802.11n protection mode

802.11n protection modes include RTS/CTS and CTS-to-self.

RTS/CTS—An AP sends an RTS packet before sending data to a client. After receiving the RTS
packet, all the devices within the coverage of the AP do not send data within the specified time.

Upon receiving the RTS packet, the client sends a CTS packet. This ensures that all the devices within

the coverage of the client do not send data within the specified time.

CTS-to-Self—An AP uses its IP address to send a CTS packet before it sends data to a client. This
ensures that all the devices within the coverage of the AP do not send data within the specified time.

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