Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) Instrukcja Użytkownika Pobierz pdf (Strona 70)

CHAPTER 7  MULTICAST FILTERING 69

General Multicast Conﬁguration Website

e General Multicast Conguration website provides global settings for multicast support.

Here, IGMP snooping can be enabled and an aging time can be specied for IGMP snoop-

ing information (see Figure 7.1).

Figure 7.1 – General Multicast Conﬁguration Website

Note

The switch supports 50 multicast groups at the same time.

 IGMP snooping – In IGMP snooping, the switch passively listens in on the IGMP mes-

sages that are sent over the network and dynamically creates the appropriate groups.

ese groups are not stored and will be lost with every power-down or when switching

o the snooping function.

 IGMP Query – A managed switch with activated query function actively transmits que-

ries at intervals and evaluates the received reports. e switch only sends IGMP query

reports if IGMP snooping is enabled.

GMRP (GARP Multicast Registration Protocol) is a GARP (Generic Attribute Registration

Protocol) application that allows the distribution of multicast group destination addresses

to layer two devices that don’t support IGMP snooping. Aer a multicast participant has

registered with the switch (e.g. through an IGMP report), the switch sends a GMRP broad-

cast packet to all GARP participating switches with the Multicast Group Destination Ad-

dress and whether the switch is joining or leaving. is allows the other switches to create

their own multicast groups and add the receiving port to the group. By default GMRP is

enabled when IGMP snooping is enabled. e receiving switches do not need to support

IGMP snooping to receive and understand the GMRP packets they receive.

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Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) Instrukcja Użytkownika Strona 70