ZyXEL Communications MES3500 series User Manual page 192

Table 73 Advanced Application > Multicast > Multicast Setting (continued)
LABEL DESCRIPTION
IGMP Filtering Select Active to enable IGMP filtering to control which IGMP groups a subscriber on a
port can join.
Note: If you enable IGMP filtering, you must create and assign IGMP filtering profiles for the
Unknown Specify the action to perform when the Switch receives an unknown multicast frame.
Multicast Frame Select Drop to discard the frame(s). Select Flooding to send the frame(s) to all ports.
Reserved The IP address range of 224.0.0.0 to 224.0.0.255 are reserved for multicasting on the
Multicast Group local 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 Drop to discard the frame(s). Select Flooding to send the frame(s) to all
ports.
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.
Note: 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, the Switch waits for IGMP reports after the multicast router 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 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.
Note: The timeout value for each IGMP report will be halved automatically by the Switch
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 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.
Chapter 25 Multicast
ports that you want to allow to join multicast groups.
because the robustness variable value (the number of query messages) is set to two
by default to cover the possibility of an IGMP GSQ being missed by IGMP host(s) or
an IGMP report being missed by the multicast router(s) due to network congestion.
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