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9-5

Cisco IOS Software Configuration Guide for Cisco Aironet Access Points

OL-5260-01

Chapter 9 Configuring Cipher Suites and WEP

Configuring Cipher Suites and WEP

Example WEP Key Setup

Table 9-2 shows an example WEP key setup that would work for the access point and an associated

device:

Because the access point’s WEP key 1 is selected as the transmit key, WEP key 1 on the other device

must have the same contents. WEP key 4 on the other device is set, but because it is not selected as the

transmit key, WEP key 4 on the access point does not need to be set at all.

Note If you enable MIC but you use static WEP (you do not enable any type of EAP authentication),

both the access point and any devices with which it communicates must use the same WEP key

for transmitting data. For example, if the MIC-enabled access point uses the key in slot 1 as the

transmit key, a client device associated to the access point must use the same key in its slot 1,

and the key in the client’s slot 1 must be selected as the transmit key.

Cipher suite with TKIP and 40-bit WEP or

128-bit WEP

Cannot configure a WEP key in key slot 1 and 4

Static WEP with MIC or CMIC Access point and client devices must use the same

WEP key as the transmit key, and the key must be

in the same key slot on both access point and

clients

Broadcast key rotation Keys in slots 2 and 3 are overwritten by rotating

broadcast keys

Note Client devices using static WEP cannot

use the access point when you enable

broadcast key rotation. When you enable

broadcast key rotation, only wireless

client devices using 802.1x authentication

(such as LEAP, EAP-TLS, or PEAP) can

use the access point.

Table 9-1 WEP Key Restrictions (continued)

Security Configuration WEP Key Restriction

Table 9-2 WEP Key Setup Example

Key

Slot

Access Point Associated Device

Transmit? Key Contents Transmit? Key Contents

1 x 12345678901234567890abcdef

–

12345678901234567890abcdef

–

09876543210987654321fedcba x 09876543210987654321fedcba

–

not set

–

not set

–

not set

–

FEDCBA09876543211234567890