Delta DVS-G928 series, Руководство пользователя

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C h a p t e r 3 F e a t u r e d F u n c t i o n s
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3.7.14 QCL Status
This page shows the QCL status by different QCL users. Each row describes the QCE that is defined. It is a conflict if a
specific QCE is not applied to the hardware due to hardware limitations. The maximum number of QCEs is 256 on each
switch.
Item Description
User
The QCL user name.
QCE# The index of QCE
Frame Type The type of frame type.
Port The port list of the QCE entry.
Action
The classification action taken on ingress frame if parameters configured are
matched with the frame's content.

Class : Classified QoS class; if a frame matches the QCE it will be put in the
queue.

DPL : Drop Precedence Level; if a frame matches the QCE then DP level will
set to value displayed under DPL column.

DSCP : If a frame matches the QCE then DSCP will be classified with the
value displayed under DSCP column.
Conflict
Displays Conflict status of QCL entries. As H/W resources are shared by
multiple applications. It may happen that resources required to add a QCE may
not be available, in that case it shows conflict status as 'Yes', otherwise it is
always 'No'. Please note that conflict can be resolved by releasing the H/W
resources required to add QCL entry on pressing 'Resolve Conflict' button.
3.8 Multicast
Multicast IP traffic is traffic that is assigned to a host group. Host groups are identified by class D IP addresses, which
range from 224.0.0.0 to 239.255.255.255. A multicast IP packet is only sent by one host to multiple hosts. Only those
hosts that belong to a specific multicast group will receive the multicast. The Internet Group Management Protocol (IGMP)
snooping enables the switch to forward multicast traffic intelligently to only the interface that requests the multicast traffic.
So the network resource is not wasted too much.
If there is a network without the multicast filtering, and a host needs to send data to many hosts, then it needs to produce
several copies in the network. It wastes too much network bandwidth. If there is a network with the multicast filtering, then
it reduces the load of resources (ex. a server) and makes the network bandwidth efficient. The figures below show the
difference between the network without Multicast Filtering and the network with Multicast Filtering.