Lucent Technologies P550 Uživatelský manuál stáhnout pdf (Strana 29)

Cajun P550 Switch Overview

Cajun P550/P220 Switch Operation Guide 1-9

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Optional per-VLAN spanning tree - This isolates loop control to smaller domains, so

spanning trees converge faster after a topology change. Otherwise, packets are

forwarded to the port’s default VLAN.

VLAN Functions

A VLAN (Virtual LAN) is a logical group of hosts on a local area network (LAN) that

communicate as if they were on the same wire, even though they are physically on

different LAN segments throughout a site.

Virtual LANs provide network managers with two significant capabilities:

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The ability to segment traffic in a flat switched network. This helps prevent traffic

from being forwarded to stations where it is not needed.

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The ability to ignore physical switch locations when creating workgroups. VLANs

are logical constructions and can traverse physical switch boundaries.

The switch hardware supports Layer 1, Layer 2, and Layer 3 VLANs. The switch-based

VLANs have the following characteristics:

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Frames classified as they enter the switch using Layer 1 (Port-based).

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Explicitly-tagged VLAN packets are forwarded based on the information in the

packet.

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VLANs define a set of ports in a flooding domain. Packets that need to be flooded

are sent only to ports participating in that VLAN (Figure 1-5).

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Lucent Technologies P550 Uživatelský manuál Strana 29