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Chapter 1 Getting to Know Your Switch
XGS2220 Series User’s Guide
38
branch office network. Within the headquarters network, a company can use trunking to group several
physical ports into one logical higher-capacity link. Trunking can be used if for example, it is cheaper to
use multiple lower-speed links than to under-utilize a high-speed, but more costly, single-port link.
Figure 8 High Performance Switching
1.2.5 IEEE 802.1Q VLAN Application Examples
A VLAN (Virtual Local Area Network) allows a physical network to be partitioned into multiple logical
networks. Stations on a logical network belong to one or more groups. With VLAN, a station cannot
directly talk to or hear from stations that are not in the same groups unless such traffic first goes through
a router.
1.2.5.1 Tag-based VLAN Example
Ports in the same VLAN group share the same frame broadcast domain thereby increase network
performance through reduced broadcast traffic. VLAN groups can be modified at any time by adding,
moving or changing ports without any re-cabling.
Shared resources such as a server can be used by all ports in the same VLAN as the server. In the
following figure only ports that need access to the server need to be part of VLAN 1. Ports can belong to
other VLAN groups too.
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