Extreme Networks Summit Summit24, Installation And User Manual

Page: 80 / 244

80 Summit24e3 Switch Installation and User Guide
Virtual LANs (VLANs)
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.
Types of VLANs
VLANs can be created according to the following criteria:
• Physical port
•
802.1Q tag
• A combination of these criteria
Port-Based VLANs
In a port-based VLAN, a VLAN name is given to a group of one or more ports on the switch. A port
can be a member of only one port-based VLAN. The Summit24e3 switch supports L2 port-based
VLANs.
For example, on the Summit24e3 switch in Figure 7, ports 1 through 8, and port 26 are part of VLAN
Sales; ports 9 through 16, and port 25 are part of VLAN Finance; and ports 17 through 24 are part of
VLAN Marketing.
Figure 7: Example of a port-based VLAN on the Summit24e3 switch
For the members of the different IP VLANs to communicate, the traffic must be routed by the switch.
This means that each VLAN must be configured as a router interface with a unique IP address.
Spanning Switches with Port-Based VLANs
To create a port-based VLAN that spans two switches, you must do two things:
1 Assign the port on each switch to the VLAN.
2 Cable the two switches together using one port on each switch per VLAN.
Figure 8 illustrates a single VLAN that spans a BlackDiamond switch and a Summit24e3 switch. All
ports on the BlackDiamond switch belong to VLAN Sales. Ports 1 through 24, and port 26 on the
Summit 24e3 switch also belong to VLAN Sales. The two switches are connected using slot 8, port 4 on
system 1 (the BlackDiamond switch), and port 26 on system 2 (the Summit24e3 switch).
SH_003
Sales
Marketing
Finance