
User manual
Broadcast only
The ingress rate is related to CoS priority. Priority Queue is based on QoS setting (the same as QoS
assorted setting includes checking CoS priority), or ingress rate will be based on default. CoS priority includes 4
queues: Low
,
Normal
,
Medium
,
High.
Operation method:
1. Choice 2 port at first, for example open the COS priority of port 4 and port 5, please according to 6.5 part
2. Then set port 4’s CoS is High, port 5’s CoS is LOW in COS mapping setting interface
3. Last, set the type of limit package and bandwidth of priority queue in Ingress bandwidth configuration
For example, keep up step 1 and 2, choice “All frame” in port 4 and 5 at step 3. Set 2M in all low priority queue
:
If priority queue bandwidth configuration is available, must mark the enter into port’s data pack as CoS.
6.4 L2 Features
1.
VLAN
VLAN
(
Virtual Local Area Network
)
is a kind of new data exchange technology for logically dividing
LAN into many segments and making many virtual work groups. This technology mainly allows that switch can
limit broadcast when LAN interconnects. This technology can divide a LAN into several logical LAN——VLAN.
Each VLAN is a broadcast domain and hosts in VLAN can communicate just like in the same LAN.But
it can not interconnect between VLAN. So broadcast message is limited in VLAN.
◎
Advantage of VLAN
Main advantage of VLAN is providing a network segmentation system which is more flexible than
traditional network. VLAN can be divided into several broadcast domain which can restrain broadcast storm.
Other advantages of VLAN are as follows:
VLAN takes convenience for devices’ relocation in network. In traditional network, manager need to take
so much time in moving and change of devices. If user transfers to different subnet, it needs to change each
terminal’s address by hand. But in VLAN, if a terminal from VLAN need to be transferred to another network, it
only need to indicate that new port without new wiring.
VLAN provides higher safety features: devices can communicate with other devices from the same
VLAN only.
IES7110-3GS switch supports based on 802.1Q VLAN. It deals with messages based on Tag of
recognized message
(
including 802.1p priority and VLAN ID, etc.
)
.
Frames with 802.1q add 4 byte Tag based on Ethernet frames, including 2 byte TPID, 3 byte Priority, 1
byte CFI and 12 byte VLAN ID.
TPID: a 16-bit field set to a value of 0x8100 in order to identify the frame as an IEEE 802.1Q-tagged
frame.
Priority: It indicates the frame priority level. Values are from 0 (best effort) to 7 (highest); 1 represents
the lowest priority.
CFI: a 1-bit field. If the value of this field is 1, the MAC address is in non-canonical format. If the value
is 0, the MAC address is in canonical format.