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34 Chapter 1 BayStack 420 Switch
209418-A
Features
The BayStack 420 Switch provides wire-speed switching that allows
high-performance, low-cost connections to full-duplex and half-duplex
10/100/1000 Mb/s Ethernet local area networks (LANs). The BayStack 420
Switch provides the following features.
Virtual Local Area Networks (VLANs)
In a traditional shared-media network, traffic generated by a station is transmitted
to all other stations on the local segment. Therefore, for any given station on the
shared Ethernet, the local segment is the collision domain because traffic on the
segment has the potential to cause an Ethernet collision. The local segment is also
the broadcast domain because any broadcast is sent to all stations on the local
segment. Although Ethernet switches and bridges divide a network into smaller
collision domains, they do not affect the broadcast domain. In simple terms, a
virtual local area network provides a mechanism to fine-tune broadcast domains.
Your BayStack 420 Switch allows you to create port-based VLANs:
• IEEE 802.1Q port-based VLANs
A port-based VLAN is a VLAN in which the ports are explicitly configured to
be in the VLAN. When you create a port-based VLAN, you assign a Port
VLAN Identifier (PVID) and specify which ports belong to the VLAN. The
PVID is used to coordinate VLANs across multiple switches.
• Auto PVID
When Auto PVID is active, a port that is assigned to a numbered VLAN has
the same number for its PVID. For example, if the VLAN is 2, the PVID is 2.
Avvertenza: Estrarre il cavo di alimentazione è l'unico sistema per spegnere
il dispositivo. Il cavo di alimentazione deve essere sempre collegato in una
posizione che permetta l'accesso facile e sicuro in caso di emergenza.