Qtech QSW-2800v2 Руководство пользователя онлайн [129/230] 481607

Qtech QSW-2800v2 Руководство пользователя онлайн [129/230] 481607
Chapter7 Security Configuration
6-2
Supporting IGMP Snooping Characteristic of QSW-2800
Support Static Layer 2 Multicast
When the multicast message is transmitting in the Ethernet, the destination of
message is not a specified receiver but is a group with uncertain member. So
when the multicast message is forwarded to de link layer from the network layer,
it cannot generate multicast forwarding table which leads to using broadcast way
to transmit multicast message in the link layer. When the device is deployed
between router and user host and applies Layer-2 forwarding characteristic, it
can transmit multicast data to the user who needs to receive the data for long
time by configuring static Layer-2 multicast (manually configure forwarding table).
Static Layer-2 multicast has the following characteristics.
Configure interface to join multicast group statically to avoid protocol message
attack.
Use the mechanism of directly searching multicast message forwarding table for
forwarding message to reduce network delay.
Avoid unregistered user receiving multicast message and provide paid service.
Support Multicast VLAN Copy
In traditional multicast forwarding mode, when users belonging to different VLAN
demand for the same multicast source, Switch needs to copy one multicast data
for each VLAN and then transmit to every VLAN. After configuring multicast
VLAN copy, when users belonging to different VLAN demand for the same
multicast source, Switch will configure one multicast VLAN for all these VLANs.
In this way, the upper router only needs transmit one set of data to this multicast
VLAN but does not need to copy a set of multicast data for each VLAN.
It can facilitate managing and controlling the multicast source and multicast group
member and also can reduce the waste of bandwidth and network extra burden.
Support IGMP Snooping Based on VLAN
IGMP version can be configured to be V1/V2/V3.
Multicast Forwarding Mode can be configured.
Support static routing interface.

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