SWT
GIGABIT/FAST ETHERNET SWITCH TYPE SWT 72/137
USER GUIDE - M0SWTA1903Iv09 - V09 March 2019
5.13 MULTICAST CONFIGURATION
Under normal conditions, multicast traffic propagates automatically on all interfaces
belonging to each VLAN, with client equipment that selectively enable the reception of
specific multicast addresses in which they are interested.
The switch has mechanisms to control the spread of multicast traffic, so not to spread on all
ports. One mechanism is by explicit and manual configuration, that is, by configuring static
entries with the multicast address of interest and the ports to which the corresponding traffic
must be transmitted.
There are other mechanisms different from manual configuration. These use standard
protocols to obtain the identification of the desired ports by each of the possible multicast
flows. The protocols are GARP/GMRP and IGMP.
The GARP/GMRP is a layer 2 protocol, and operates by explicit register of the client
equipment in the network switches.
GARP is a base protocol on which GMRP operates. GARP requires the configuration of
timers by accessing the screen shown in Figure 39.
FIGURE 39 GARP Timers menu configuration page
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