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SETUP
Page 40
DOC_DEV_XS_Setup guide_C
10
IGMP snooping
10.1
Overview
By default, a switch floods all multicast frames to all is ports. In heavy traffic scenarios, this can cause
saturation of the links, especially on slower SHDSL connections. To avoid this and take informed bridging
decisions, a switch can inspect the IGMP traffic that peers doing multicast exchange.
In a typical multicast enabled network, there is a multicast router. This device queries periodically using IGMP
the other hosts to know which peers want to receive what multicast traffic.
The switch, when forwarding the frames, will check whether or not it should forward or block a given traffic on
a given port.
When there is no multicast router to query the network, one of the IGMP snooping enabled switch can do the
queries. The device with the lowest IP address is elected as the querier for the network.
10.2
Setting up the IGMP snooping function
•
In the menu, choose
Setup > Ethernet and switching > IGMP snooping
.
•
Tick the
Enable IGMP snooping
checkbox.
Enable IGMP snooping
Enable the filtering/forwarding of IP multicast packets based on IGMP traffic.
Enable IGMP snooping querier mode
Enable the XS to be elected querier if there is no router on the network.
Router mode for LAN1
Router mode for LAN2
Router mode for SH1
Router mode for SH2
Router mode for SH3
Router mode for SH4
Accept all multicast traffic from this port.
Summary of Contents for XLAN+ Series
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