Avaya Cajun P880 Manager 5.1, Руководство по установке, Страница: 21 / 62

Cajun P550R/P880/P882 Installation Guide
Introduction
1-15
Virtual Bridging Functions
All three switches are designed to support:
■
Up to 24,000 MAC addresses in the switch address forwarding
table — allows the switch to store forwarding information for
hosts in very large networks.
■
Segmented address tables qualified by address and VLAN
membership — allows the same host to appear on different
VLANs on different ports.
■
Optional per-VLAN STP — 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.
Flood Pruning Using VLANs
VLANs 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 hardware on all three switches support port-based VLANs with
the following characteristics:
■
F
rames classified as
Layer 1 (Port-based) when
they enter the
switch
■
Explicitly tagged VLAN packets — these are forwarded based on
the information in the packet.
■
Up to 1,000 VLANs — 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 1-1).