CTS FOS-3128 Series - Q Vlan

176
Current/Total/Max: The number of current, total and maximum Port-Based VLAN entry or entries.
Port Name: Use the default name or specify a name for your Port-Based VLAN.
Port Number: By clicking on the checkbox of the corresponding ports, it denotes that the selected
ports belong to the specified Port-Based VLAN.
4.4.7.2 802.1Q VLAN
802.1Q VLAN Concept
Port-Based VLAN is simple to implement and use, but it cannot be deployed cross switches VLAN.
The 802.1Q protocol was developed in order to provide the solution to this problem. By tagging
VLAN membership information to Ethernet frames, the IEEE 802.1Q can help network
administrators break large switched networks into smaller segments so that broadcast and
multicast traffic will not occupy too much available bandwidth as well as provide a higher level
security between segments of internal networks.
Introduction to 802.1Q Frame Format:
Preamble
SFD
DA
SA
Type/LEN
PAYLOAD
FCS
Original frame
Preamble
SFD
DA
SA
TAG
TCI/P/C/VID
Type/LEN
PAYLOAD
FCS
802.1q
frame
PRE Preamble
62 bits
Used to synchronize traffic
SFD Start Frame Delimiter
2 bits
Marks the beginning of the header
DA Destination Address
6 bytes
The MAC address of the destination
SA Source Address
6 bytes
The MAC address of the source
TCI Tag Control Info
2 bytes set to 8100 for 802.1p and Q tags
P Priority
3 bits
Indicates 802.1p priority level 0-7
C Canonical Indicator
1 bit
Indicates if the MAC addresses are in