Extreme Networks Summit1 - Manual (Page 88)

5-2 S UMMIT S WITCH I NSTALLATION AND U SER G UIDE
V IRTUAL LAN S (VLAN S )
• VLANs provide extra security.
Devices within each VLAN can only communicate with member devices in the same
VLAN. If a device in VLAN Marketing must communicate with devices in VLAN
Sales, the traffic must cross a routing device.
• VLANs ease the change and movement of devices.
With traditional networks, network administrators spend much of their time dealing
with moves and changes. If users move to a different subnetwork, the addresses of
each endstation must be updated manually.
For example, with a VLAN, if an endstation in VLAN Marketing is moved to a port
in another part of the network, and retains its original subnet membership; you must
only specify that the new port is in VLAN Marketing.
T
YPES OF
VLAN
S
The Summit supports a maximum of 256 VLANs. Summit VLANs can be created
according to the following criteria:
• Physical port
• 802.1Q tag
• Ethernet, LLC SAP, or LLC/SNAP Ethernet protocol type
• A combination of these criteria
P ORT -B ASED VLAN S
In a port-based VLAN, a VLAN name is given to a group of one or more ports on the
switch. A switch port can be a member of only one port-based VLAN.
Summit.bk : 5VLAN.FM Page 2 Thursday, June 18, 1998 9:27 AM