106 Summit 200 Series Switch Installation and User Guide
Virtual LANs (VLANs)
MAC-Based VLAN Limitations
The following list contains the limitations of MAC-based VLANs:
• Ports participating in MAC VLANs must first be removed from any static VLANs.
• The MAC-to-VLAN mapping can only be associated with VLANs that exist on the switch.
• A MAC address cannot be configured to associate with more than 1 VLAN. If this is attempted, the
MAC address is associated with the most recent VLAN entry in the MAC-to-VLAN database.
• The feature is intended to support one client per physical port. Once a client MAC address has
successfully registered, the VLAN association remains until the port connection is dropped or the
FDB entry ages out.
• The MAC-to-VLAN database is stored in memory, only. It is not stored in NVRAM. As a result, the
the VLAN associations are lost during a reboot and you must perform an incremental download of
the MAC-to-VLAN database to recover the VLAN associations.
MAC-Based VLAN Example
In this following example, three VLANs are created: engineering, marketing, and sales. A single MAC
address is associated with each VLAN. The MAC address 00:00:00:00:00:02 has a group number of
“any” or “0” associated with it, allowing it to be plugged into any port that is in MacVlanDiscover
mode (ports 10-15 in this case). The MAC address 00:00:00:00:00:01 has a group number of 10 associated
with it, and can only be assigned to a VLAN if inserted into ports 16 or 17. The MAC address
00:00:00:00:00:03 has a group number of 200 associated with it and can only be inserted into ports 18
through 20.
enable mac-vlan mac-group any ports 10-15
enable mac-vlan mac-group 10 ports 16-17
enable mac-vlan mac-group 200 ports 18-20
config mac-vlan add mac-address 00:00:00:00:00:01 mac-group 10 engineering
config mac-vlan add mac-address 00:00:00:00:00:02 mac-group any marketing
config mac-vlan add mac-address 00:00:00:00:00:03 mac-group 200 sales
Timed Configuration Download for MAC-Based VLANs
To allow centralized control of MAC-based VLANs over multiple switches, a timed TFTP configuration
download allows you to download incremental configuration files from a primary or secondary server
at specified time intervals. The timed downloads are configurable in 24 hour intervals. When a switch
reboots, the configuration is automatically downloaded immediately after booting, per the configured
primary and secondary servers.
To configure the primary and/or secondary server and file name, use the following command:
config download server [primary | secondary] [<host_name> | <ip_address>] <filename>
To enable timed interval downloads, use the following command:
download configuration every <hour:minute>
To display timed download information, use the following command:
show switch
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