P-79X Series User’s Guide
160
CHAPTER 16
802.1Q
16.1 Overview
This chapter describes how to configure the 802.1Q settings.
A Virtual Local Area Network (VLAN) allows a physical network to be partitioned into multiple logical
networks. A VLAN group can be treated as an individual device. Each group can have its own rules
about where and how to forward traffic. You can assign any ports on the P-79X to a VLAN group and
configure the settings for the group. You may also set the priority level for traffic trasmitted through
the ports.
Figure 97 802.1Q
16.1.1 What You Can Do in the 802.1Q Screens
•Use the Group Setting screen (Section 16.2 on page 163) to activate 802.1Q, specify the
management VLAN group, display the VLAN groups and configure the settings for each VLAN
group.
•Use the Port Setting screen (Section 16.3 on page 165) to configure the PVID.
16.1.2 What You Need to Know About 802.1Q
IEEE 802.1Q Tagged VLAN
Tagged VLAN uses an explicit tag (VLAN ID) in the MAC header to identify the VLAN membership of
a frame across bridges - they are not confined to the device on which they were created. The VLAN
ID associates a frame with a specific VLAN and provides the information that devices need to
process the frame across the network.
Forwarding Tagged and Untagged Frames
Each port on the device is capable of passing tagged or untagged frames. To forward a frame from
an 802.1Q VLAN-aware device to an 802.1Q VLAN-unaware device, the P-79X first decides where to
forward the frame and then strips off the VLAN tag. To forward a frame from an 802.1Q VLAN-
unaware device to an 802.1Q VLAN-aware switch, the P-79X first decides where to forward the
frame, and then inserts a VLAN tag reflecting the ingress port's default VID. The default PVID is
VLAN 1 for all ports, but this can be changed.
To Next Page
Loading...
Need help?
General
