ZyXEL Communications XS1930 Series User Manual page 198

Table 92 Advanced Application > Multicast > IPv4 Multicast > IGMP Snooping (continued) (continued)
LABEL DESCRIPTION
Querier Select this option to allow the Switch to send IGMP General Query messages to the VLANs with
the multicast hosts attached.
Report Proxy Select this option to allow the Switch to act as the IGMP report proxy and leave proxy. It will
report group changes to a connected multicast router.
The Switch not only checks IGMP packets between multicast routers/switches and multicast
hosts to learn the multicast group membership, but also replaces the source MAC address in
an IGMP v1/v2 report with its own MAC address before forwarding to the multicast router/
switch. When the Switch receives more than one IGMP v1/v2 join report that requests to join
the same multicast group, it only sends a new join report with its MAC address. This helps
reduce the number of multicast join reports passed to the multicast router/switch.
The Switch sends a leave message with its MAC address to the multicast router/switch only
when it receives the leave message from the last host in a multicast group.
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 No-Change to not replace the priority.
IGMP Filtering Select Active to enable IGMP filtering to control which IGMP groups a subscriber on a port
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.
Frame
• Select Drop to discard the frame(s).
• Select Flooding to send the frame(s) to all ports.
Unknown Multicast Specify the action to perform when Unknown Multicast Frame is set to Drop.
Frame to Querier
• Select Drop to discard the frame(s).
Port
• Select Forwarding to send the frame(s) to all querier ports.
• Select Forwarding on VLAN and enter the VLAN ID number(s) to send the frame(s) to the
ports which are used as an IGMP query port on the specified VLAN(s). Use a dash to
specify consecutive VLANs and a comma (no spaces) to specify non-consecutive VLANs.
For example, 51-53 includes 51, 52 and 53, but 51,53 does not include 52.
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 Drop to discard the frame(s).
• Select Flooding to send the frame(s) to all ports.
Port This field displays the port number. * means all ports.
* 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.
Chapter 24 Multicast
XS1930 Series User's Guide
198