Avaya P550 Manual Do Utilizador

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Cajun P550 Switch Overview
Cajun P550/P220 Switch Operation Guide
 1-9
❒ 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:
❒ The ability to segment traffic in a flat switched network. This helps prevent traffic 
from being forwarded to stations where it is not needed.
❒ 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:
❒ Frames classified as they enter the switch using Layer 1 (Port-based). 
❒ Explicitly-tagged VLAN packets are forwarded based on the information in the 
packet. 
❒ 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).