ZyXEL Communications GS1920v2 Series User Manual page 207

Table 82 Advanced Application > Multicast > IPv4 Multicast > IGMP Snooping (continued) (continued)
L ABEL DESC RIPT IO N
Host Timeout Specify the time (from 1 to 16 711 450) in seconds that elapses before the Switch removes an
IGMP group membership entry if it does not receive report messages from the port.
802.1p Priority Select a priority level (0-7) to which the Switch changes the priority in outgoing IGMP control
packets. Otherwise, select
IGMP Filtering Select
can join.
If you enable IGMP filtering, you must create and assign IGMP filtering profiles for the ports that
you want to allow to join multicast groups.
Unknown Multicast Specify the action to perform when the Switch receives an unknown multicast frame. Select
Frame to discard the frame(s). Select
Dro p
Reserved Multicast The IP address range of 224.0.0.0 to 224.0.0.255 are reserved for multicasting on the local
Group network only. For example, 224.0.0.1 is for all hosts on a local network segment and 224.0.0.9 is
used to send RIP routing information to all RIP v2 routers on the same network segment. A
multicast router will not forward a packet with the destination IP address within this range to
other networks. See the IANA web site for more information.
The layer-2 multicast MAC addresses used by Cisco layer-2 protocols, 01:00:0C:CC:CC:CC
and 01:00:0C:CC:CC:CD, are also included in this group.
Specify the action to perform when the Switch receives a frame with a reserved multicast
address. Select
Port This field displays the port number.
* Settings in this row apply to all ports.
Use this row only if you want to make some settings the same for all ports. Use this row first to set
the common settings and then make adjustments on a port-by-port basis.
Changes in this row are copied to all the ports as soon as you make them.
Immed. Leave Select this option to set the Switch to remove this port from the multicast tree when an IGMP
version 2 leave message is received on this port.
Select this option if there is only one host connected to this port.
Normal Leave Enter an IGMP normal leave timeout value (from 200 to 6,348,800) in miliseconds. Select this
option to have the Switch use this timeout to update the forwarding table for the port.
In normal leave mode, when the Switch receives an IGMP leave message from a host on a
port, it forwards the message to the multicast router. The multicast router then sends out an
IGMP Group-Specific Query (GSQ) message to determine whether other hosts connected to
the port should remain in the specific multicast group. The Switch forwards the query message
to all hosts connected to the port and waits for IGMP reports from hosts to update the
forwarding table.
This defines how many seconds the Switch waits for an IGMP report before removing an IGMP
snooping membership entry when an IGMP leave message is received on this port from a
host.
Fast Leave Enter an IGMP fast leave timeout value (from 200 to 6,348,800) in miliseconds. Select this
option to have the Switch use this timeout to update the forwarding table for the port.
In fast leave mode, right after receiving an IGMP leave message from a host on a port, the
Switch itself sends out an IGMP Group-Specific Query (GSQ) message to determine whether
other hosts connected to the port should remain in the specific multicast group. This helps
speed up the leave process.
This defines how many seconds the Switch waits for an IGMP report before removing an IGMP
snooping membership entry when an IGMP leave message is received on this port from a
host.
Group Limited Select this option to limit the number of multicast groups this port is allowed to join.
Chapter 24 Multicast
No - C ha ng e
to enable IGMP filtering to control which IGMP groups a subscriber on a port
Ac tive
to discard the frame(s). Select
Dro p
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to not replace the priority.
to send the frame(s) to all ports.
Flo o ding
to send the frame(s) to all ports.
Flo o ding