DGS-1216T Firmware Release Notes  

Firmware: v4.21.01
Hardware: A1
Date: January 8th, 2009

Problems Resolved:
1.Fix the bug that clients connected to switch will not obtain IP from DHCP server when switch configured to DHCP interface
2.Fix the bug that Management VLAN does not work if users create over 32 VLAN groups.
3.Fix the bug that device does not respond PING or Web after applying the VLAN configurations from a Linux station.
4.Fix the following bugs of 802.1X:
- Cannot block the port after authentication failure
- Unplug the authorized port, it will remain in “Authorized” status 



Note: 
This firmware v4.21.01 is for v4.20.xx/v4.10.xx upgrading only. If the device is with firmware v4.00.xx, please follow up the “New Firmware Upgrade Procedure “sheet to upgrade the firmware from v4.00.xx to v4.21.01. If the device is with new firmware v4.21.01, it is not allowed to downgrade previous firmware v4.20.xx/v4.10.xx.

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Firmware: v4.20.13
Hardware: D2/D1
Date: June 26th, 2008

Problems Resolved:
1. Fix the problem of DHCP option field parsing error


Note: 
This firmware v4.20.13 is for v4.20.xx/v4.10.xx upgrading only. If the device is with firmware v4.00.xx, please follow up the “New Firmware Upgrade Procedure “sheet to upgrade the firmware from v4.00.xx to v4.20.13. If the device is with new firmware v4.20.13, you canot downgrade to previous firmware v4.20.xx/v4.10.xx.


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Firmware: v4.20.11
Hardware: D2/D1
Date: March. 3rd, 2008


Problems Resolved:N/A

Enhancements:
1.Feature enhancements are as follows.
2.Trusted Host
3.Cable Diagnostics
4.Management VLAN
5.Asymmetric VLAN
6.DSCP QoS
7.Power Saving


Note: 
1. Firmware v4.20.11 is not backward compatible with previous hardware revisions B1/C1.
2. Please follow the upgrade sequence carefully. 

3. This firmware v4.20.11 is for v4.20.xx/v4.10.xx upgrading only. If the device is with firmware v4.00.xx, please    follow up the “New Firmware Upgrade Procedure “sheet to upgrade the firmware from v4.00.xx to v4.20.11.

4. The firmware v4.20.11 is backward compatible with previous hardware version D1, but the power saving function is    only applied for hardware version D2 (Green edition).