User guide

28 ExtremeWare 7.2e Installation and User Guide

Summit 400-48 Switch Overview and Installation

The switch determines whether the port is the primary or redundant port based upon the order in

which the cables are inserted into the switch. When the switch senses that cables are in both the fiber

and corresponding copper port, the switch enables the uplink redundancy feature. For example, if you

insert mini-GBICs into ports 1X and 3X first, and then connect copper ports 1 and 3, the switch assigns

ports 1 and 3 as redundant ports.

Figure 4: Redundancy cabling

You can override the configuration and behavior of these ports through the CLI. Using the CLI, you can

set a preference for either fiber or copper. You can also turn off port redundancy using the force option.

If a combination port fails to link, determine whether the force option is in effect. For more information

about using the CLI to set redundancy priority, see “Configuring Ports” on page 77.

The Summit 400-48 switch Gigabit Ethernet port failover from the fiber link to the copper link takes 4-5

seconds. The Summit 400-48t switch Gigabit Ethernet port failover from the copper link to the fiber link

takes 2-3 seconds.

NOTE

To support automatic failover between the fiber and copper ports, you must use an Extreme mini-GBIC

connector.

Software Overview

Virtual LANs (VLANs)

ExtremeWare has a VLAN feature that enables you to construct your broadcast domains without being

restricted by physical connections. A VLAN is a group of location- and topology-independent devices

that communicate as if they were on the same physical local area network (LAN).

Implementing VLANs on your network has the following three advantages:

• VLANs help to control broadcast traffic. If a device in VLAN Marketing transmits a broadcast frame,

only VLAN Marketing devices receive the frame.

• VLANs provide extra security. Devices in VLAN Marketing can only communicate with devices on

VLAN Sales using routing services.

• VLANs ease the change and movement of devices on networks.

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