Siemens S223 - Manual (Page 290)

UMN:CLI User Manual
SURPASS hiD 6615 S223/S323 R1.5
290 A50010-Y3-C150-2-7619
Multicast Packet
Multicast Router
hiX 5430
1. Request the
Multicast Packet
2. Transmit the Multicast packet to
the port that send join massage
Multicast Join request
Multicast Packet
Fig. 9.4 IP Multicasting
IGMP Snooping is a function that finds port, which sends「Join message」to join in
specific multicast group to receive multicast packet or「Leave message」to get out of
the multicast group because it does not need packets.
Only when the switch is connected to multicast router, IGMP Snooping can be enabled.
9.2.5.1 IGMP v2 Snooping Fast Leave
If the Multicast client sends the leave massage to leave out Multicast group, Multicast
router sends IGMP Query massage to the client again, and when the client does not re-
spond, delete the client from the Multicast group.
In IGMP v2, even after Host sent Leave Message, it receives Multicast Traffic until send-
ing Specific Query. In Snooping Fast-Leave Enable mode, it sends no more Multicast
Traffic immediately by deleting from Membership Table when receive Leave Message
without sending Specific Query.
Command Mode Description
ip igmp snooping immediate-
leave
Configures the fast-leave on the system.
ip igmp snooping vlan VLANS
immediate-leave
Global
Configures the fast-leave on a VLAN interface.