User`s guide

AT-S24 Version 2.2.2 Management Software Release Notes
PN 613-50247-00 Rev A 4 Allied Telesyn International
• Port Trunks and Static MAC Addresses
Disconnecting the cables of a port trunk from the switch caused the MAC addresses
learned dynamically on the ports to be converted into static MAC addresses. This problem
has been resolved. MAC addresses learned dynamically on a port trunk remain as dynamic
addresses.
• Upgrading the AT-S24 Management Software Using TFTP
Previous versions of the management software did not allow you to download a new
version of the AT-S24 software onto a switch using TFTP. This problem has been resolved.
For instructions on how to download software using TFTP, refer to Chapter 8 in the AT-S24
Version 2.01 User’s Guide.
• Port Mirroring with Expansion Modules
This version of the management software supports port mirroring on expansion modules.
New Features in Earlier Version 2.01
• Multiple VLAN Mode (renamed Preset Ports Edition in Version 2.2.0)
AT-S24 Version 2.01 has a new feature called the Multiple VLAN Mode. Activating this
mode automatically places each port in a separate VLAN along with a tagged uplink port.
This highly segmented configuration is useful in situations where the traffic generated by
each end node or network segment connected to a port on the switch needs to be kept
separate from all other network traffic. For further information on this feature, refer to the
section “Activating and Deactivating the Multiple VLAN Mode” in Chapter 5 of the AT-S24
Version 2.01 User’s Guide.
• Port Security Enhancement
The port security feature has been expanded. You can now set a maximum value for the
number of MAC addresses each port on the switch can learn. Once the maximum value has
been reached, the port will discard packets with unknown addresses. This can prevent
unauthorized end nodes from accessing switch ports. For further information on this
feature, refer to the section “Configuring Port Security” in Chapter 3 of the AT-S24 Version
2.01 User’s Guide.
• Priority Queuing
You can now adjust the algorithm used by the management software to handle packets in
the normal and high priority queues. The default setting specifies that packets in the high
priority queue receive six times more importance than packets in the normal queue. You
can adjust this from a low of one to one, where packets in the two queues are handled
equally, to a high of twelve to one, where high priority packets receive twelve times more
importance than packets in the normal priority queue. For further information on this
feature, refer to the section “Configuring Switch Priority Queuing” in Chapter 5 of the AT-
S24 Version 2.01 User’s Guide.