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VLAN
A Virtual LAN (VLAN) is a group of ports that form a logical
Ethernet segment on a Layer 2 Switch which provides better
administration, security, and management of multicast
traffic. A VLAN is a network topology configured according
to a logical scheme rather than a physical layout. When you
use a VLAN, users can be grouped by logical function instead
of physical location. All ports that frequently communicate
with each other are assigned to the same VLAN, regardless
of where they are physically on the network. VLANs let you
logically segment your network into different broadcast
domains so that you can group ports with related functions
into their own separate, logical LAN segments on the same
Switch. This allows broadcast packets to be forwarded only
between ports within the VLAN which can avoid broadcast
packets being sent to all the ports on a single Switch. A
VLAN also increases network performance by limiting
broadcasts to a smaller and more manageable logical
broadcast domain. VLANs also improve security by limiting
traffic to specific broadcast domains.
802.1Q
Each VLAN in a network has an associated VLAN ID, which
appears in the IEEE 802.1Q tag in the Layer 2 header
of packets transmitted on a VLAN. The IEEE802.1Q
specification establishes a standard method for tagging
Ethernet frames with VLAN membership information.
The key for IEEE802.1Q to perform its functions is in its
tags. 802.1Q-compliant Switch ports can be configured to
transmit tagged or untagged frames. A tag field containing
VLAN information can be inserted into an Ethernet frame.
When using 802.1Q VLAN configuration, you configure
ports to be a part of a VLAN group. When a port receives
data tagged for a VLAN group, the data is discarded unless
the port is a member of the VLAN group.
Содержание EWS5912FP
Страница 7: ...7 Chapter 1 Product Overview ...
Страница 19: ...19 Chapter 2 Controller Management ...
Страница 47: ...47 Apply Click APPLY to update the the system settings ...
Страница 65: ...65 Chapter 3 Switch Management ...
Страница 78: ...78 Apply Click APPLY to update the the system settings ...
Страница 116: ...116 Group List The Group List displays VLAN ID Group IP Address and Members Port in the IGMP Snooping List ...
Страница 120: ...120 Group List The Group List displays the VLAN ID IPv6 Address and Members Port in the MLD Snooping List ...
Страница 165: ...165 Apply Click Apply to update the system settings ...
Страница 187: ...187 Click the Apply button to accept the changes or the Cancel button to discard them ...
Страница 194: ...194 Chapter 4 Maintenance ...
Страница 198: ...198 Appendix ...