ZyXEL Communications XGS-4528F, Руководство пользователя, Страница: 231 / 491

Chapter 24 Multicast
XGS-4526/4528F/4728F User’s Guide
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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.
Group Limited Select this option to limit the number of multicast groups this port is
allowed to join.
Max Group
Num. Enter the number of multicast groups this port is allowed to join. Once a
port is registered in the specified number of multicast groups, any new
IGMP join report frame(s) is dropped on this port.
Throttling IGMP throttling controls how the Switch deals with the IGMP reports
when the maximum number of the IGMP groups a port can join is
reached.
Select Deny to drop any new IGMP join report received on this port
until an existing multicast forwarding table entry is aged out.
Select Replace to replace an existing entry in the multicast forwarding
table with the new IGMP report(s) received on this port.
IGMP Filtering
Profile Select the name of the IGMP filtering profile to use for this port.
Otherwise, select Default to prohibit the port from joining any
multicast group.
You can create IGMP filtering profiles in the Multicast > Multicast
Setting > IGMP Filtering Profile screen.
IGMP Querier
Mode The Switch treats an IGMP query port as being connected to an IGMP
multicast router (or server). The Switch forwards IGMP join or leave
packets to an IGMP query port.
Select Auto to have the Switch use the port as an IGMP query port if
the port receives IGMP query packets.
Select Fixed to have the Switch always use the port as an IGMP query
port. Select this when you connect an IGMP multicast server to the
port.
Select Edge to stop the Switch from using the port as an IGMP query
port. The Switch will not keep any record of an IGMP router being
connected to this port. The Switch does not forward IGMP join or leave
packets to this port.
Apply Click Apply to save your changes to the Switch’s run-time memory. The
Switch loses these changes if it is turned off or loses power, so use the
Save link on the top navigation panel to save your changes to the non-
volatile memory when you are done configuring.
Cancel Click Cancel to begin configuring this screen afresh.
Table 63 Advanced Application > Multicast > Multicast Setting (continued)
LABEL DESCRIPTION