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Status: Verified (1)

RFC 5416, "Control and Provisioning of Wireless Access Points (CAPWAP) Protocol Binding for IEEE 802.11", March 2009

Errata ID: 3682
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Bulavskiy Dmitriy
Date Reported: 2013-07-15
Verifier Name: Benoit Claise
Date Verified: 2013-07-28

Section 2.4. says:

The AC will signal the update to the GTK using an IEEE 802.11
Configuration Request message, including an IEEE 802.11 Update WLAN
message element with the new GTK, its index, the Transmit Sequence
Counter (TSC) for the Group Key and the Key Status set to 3 (begin
GTK update).
...
When the AC has completed the GTK update to all
STAs in the BSS, the AC MUST transmit an IEEE 802.11 Configuration
Request message including an IEEE 802.11 Update WLAN message element
containing the new GTK, its index, and the Key Status set to 4 (GTK
update complete).

It should say:

The AC will signal the update to the GTK using an IEEE 802.11
Configuration Request message, including an IEEE 802.11 Update WLAN
message element with the new GTK, its index, the Transmit Sequence
Counter (TSC) for the Group Key and the Key Status set to 2 (begin
GTK update).
...
When the AC has completed the GTK update to all
STAs in the BSS, the AC MUST transmit an IEEE 802.11 Configuration
Request message including an IEEE 802.11 Update WLAN message element
containing the new GTK, its index, and the Key Status set to 3 (GTK
update complete).

Notes:

Key Status field is defined as follows:
2 - The value of 2 indicates that the AC will begin rekeying the
GTK with the STA's in the BSS. It is only valid when IEEE
802.11 is enabled as the security policy for the BSS.

3 - The value of 3 indicates that the AC has completed rekeying
the GTK and broadcast packets no longer need to be duplicated
and transmitted with both GTK's.

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