cd11IfVlanEncryptKeyLen 1.3.6.1.4.1.9.9.272.1.1.1.9.1.3

This object specifies the length in octets of cd11IfVlanEncryptKeyValue. Common values are 5 for 40-bit WEP key and 13 for 128-bit WEP key. A value of '0' means that the key is not set but the VLAN is enabled.