117
■
VLAN Classification
When the switch receives a frame, it classifies the frame in one of two ways. If the frame is untagged, the switch assigns the frame
to an associated VLAN (based on the default VLAN ID of the receiving port). But if the frame is tagged, the switch uses the tagged
VLAN ID to identify the port broadcast domain of the frame.
■
Port Overlapping
Port overlapping can be used to allow access to commonly shared network resources among different VLAN groups, such as file
servers or printers. Note that if you implement VLANs which do not overlap, but still need to communicate, you can connect them by
enabled routing on this switch.
■
Untagged VLANs
Untagged (or static) VLANs are typically used to reduce broadcast traffic and to increase security. A group of network users
assigned to a VLAN form a broadcast domain that is separate from other VLANs configured on the switch. Packets are forwarded
only between ports that are designated for the same VLAN. Untagged VLANs can be used to manually isolate user groups or
subnets.
4.6.3 VLAN Port Configuration
This Page is used for configuring the Managed Switch port VLAN. The VLAN per Port Configuration Page contains fields for
managing ports that are part of a VLAN. The port default VLAN ID (PVID) is configured on the VLAN Port Configuration Page. All
untagged packets arriving to the device are tagged by the ports PVID.
Understand nomenclature of the Switch
■
IEEE 802.1Q Tagged and Untagged
Every port on an 802.1Q compliant switch can be configured as tagged or untagged.
Tagged:
Ports with tagging enabled will put the VID number, priority and other VLAN information into the
header of all packets that flow into those ports. If a packet has previously been tagged, the port
will not alter the packet, thus keeping the VLAN information intact. The VLAN information in the
tag can then be used by other 802.1Q compliant devices on the network to make
packet-forwarding decisions.
Untagged:
Ports with untagging enabled will strip the 802.1Q tag from all packets that flow into those
ports. If the packet doesn't have an 802.1Q VLAN tag, the port will not alter the packet. Thus,
all packets received by and forwarded by an untagging port will have no 802.1Q VLAN
Содержание NS4702-24P-4S-4X
Страница 1: ...NS4702 24P 4S 4X User Manual P N 1072829 REV 00 01 ISS 14JUL14 ...
Страница 23: ...23 Storage Temperature 10 70 degrees C Relative Humidity 5 95 non condensing ...
Страница 164: ...164 Figure 4 8 2 Multicast Flooding ...
Страница 183: ...183 Figure 4 8 14 IGMP Snooping VLAN Configuration Page Screenshot ...
Страница 189: ...189 Figure 4 8 17 MLD Snooping Groups Information Page Screenshot ...
Страница 203: ...203 Buttons Click to apply changes Click to undo any changes made locally and revert to previously saved values ...
Страница 208: ...208 Figure 4 9 6 QoS Egress Port Tag Remarking Page Screenshot ...
Страница 218: ...218 Deletes the QCE The lowest plus sign adds a new entry at the bottom of the list of QCL ...
Страница 229: ...229 Figure 4 9 18 Voice VLAN Configuration Page Screenshot ...
Страница 252: ...252 Buttons Click to apply changes Click to undo any changes made locally and revert to previously saved values ...
Страница 291: ...291 measurement is 100 ms A value of 0 ms indicates that there hasn t been round trip communication with the server yet ...
Страница 299: ...299 Figure 4 11 17 Add User Properties Screen Figure 4 11 18 Add User Properties Screen ...
Страница 336: ...336 Figure 4 14 2 LLDPMED Configuration Page Screenshot ...
Страница 357: ...357 Figure 4 15 4 VeriPHY Cable Diagnostics Page Screenshot ...
Страница 367: ...367 ...
Страница 375: ...375 Figure 4 16 10 Port Power Consumption Screenshot Buttons Click to refresh the page immediately ...
Страница 391: ...391 ...