D-Link DES 6000 Product Manual - Page 57

IP Multicast Filtering Age-out Timer 30-9999, IP Multicast Filtering IGMP Snooping

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Modular Ethernet Switch User's Guide To add or remove Static Multicast Filters, choose Add or Remove in the Action field. Then enter the multicast MAC Address and VID (if Port-based or 802.1Q VLANs are enabled). Next, choose which ports can receive packets from the multicast group by positioning the cursor over the appropriate port and hitting to change the dash (-) to a V. Press APPLY to put the changes into effect. Toggle the Allow dynamic updates via IGMP? field between Enabled and Disabled to either allow or not allow IGMP Snooping and dynamic multicast table updates. Configure IGMP Internet Group Management Protocol (IGMP) allows multicasting on your network. When IP Multicast Filtering is enabled, the Switch can intelligently forward (rather that broadcast) IGMP queries and reports sent between devices connected to the Switch and an IGMP-enabled device hosting IGMP on your network. Enabling IP Multicast Filtering automatically enables IGMP snooping, which enables the switch to read IGMP packets being forwarded through the switch in order to obtain forwarding information from them (dynamically learn which ports contain Multicast members), and forward multicast packets only to the members. Basically, in these submenus you define whether the Switch can intelligently forward IGMP packets, and you must also define which 802.1Q VLANs (if present) can send and receive IGMP and Multicast packets. To access the IGMP Configuration screen, select Configure Filtering and Forwarding Table from the System Configuration menu. Then select Configure IGMP from the bottom of the Configure Filtering and Forwarding table screen. The following screen appears: Figure 6-26. IGMP Configuration screen Items in the above window are defined as follows: ♦ IP Multicast Filtering Age-out Timer (30-9999) When this timer expires and the Switch has not observed (snooped) any IGMP query packets asking whether any stations belong to any Multicast groups, the switch itself will send out queries and become the IGMP host on your network. ♦ IP Multicast Filtering (IGMP Snooping) This enables/disables the Switch to intelligently forward IGMP and Multicast packets instead of broadcasting (flooding) them on all ports. This setting also enables IGMP Snooping, which enables the switch to read IGMP packets being forwarded through the switch in order to obtain forwarding information from them (learn which ports contain Multicast members). The bottom of this screen allows you to configure IGMP for individual VLANs. If 802.1Q or port-based VLANs are enabled on your network, you must specify which VLANs can support multicast traffic. Choose Configure 802.1Q IGMP or Configure Port-based IGMP depending on the type of VLANs you are using. 52 Using the Console Interface

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Modular Ethernet Switch User’s Guide
52
Using the Console Interface
To add or remove Static Multicast Filters, choose
Add
or
Remove
in the Action field. Then enter the multicast
MAC Address
and VID (if Port-based or 802.1Q VLANs are enabled). Next, choose which ports can receive
packets from the multicast group by positioning the cursor over the appropriate port and hitting <space bar>
to change the dash (-) to a
V
. Press APPLY to put the changes into effect.
Toggle the Allow dynamic updates via IGMP? field between Enabled and Disabled to either allow or not allow
IGMP Snooping and dynamic multicast table updates.
Configure IGMP
Internet Group Management Protocol (IGMP) allows multicasting on your network. When IP Multicast
Filtering is enabled, the Switch can intelligently forward (rather that broadcast) IGMP queries and reports
sent between devices connected to the Switch and an IGMP-enabled device hosting IGMP on your network.
Enabling IP Multicast Filtering automatically enables IGMP snooping, which enables the switch to read
IGMP packets being forwarded through the switch in order to obtain forwarding information from them
(dynamically learn which ports contain Multicast members), and forward multicast packets only to the
members.
Basically, in these submenus you define whether the Switch can intelligently forward IGMP packets, and you
must also define which 802.1Q VLANs (if present) can send and receive IGMP and Multicast packets.
To access the
IGMP Configuration
screen, select
Configure Filtering and Forwarding Table
from the
System Configuration
menu. Then select
Configure IGMP
from the bottom of the
Configure Filtering
and Forwarding table
screen. The following screen appears:
Figure 6-26.
IGMP Configuration screen
Items in the above window are defined as follows:
♦
IP Multicast Filtering Age-out Timer (30-9999)
When this timer expires and the Switch has not
observed (snooped) any IGMP query packets asking whether any stations belong to any Multicast groups,
the switch itself will send out queries and become the IGMP host on your network.
♦
IP Multicast Filtering (IGMP Snooping)
This enables/disables the Switch to intelligently forward
IGMP and Multicast packets instead of broadcasting (flooding) them on all ports. This setting also
enables IGMP Snooping, which enables the switch to read IGMP packets being forwarded through the
switch in order to obtain forwarding information from them (learn which ports contain Multicast
members).
The bottom of this screen allows you to configure IGMP for individual VLANs. If 802.1Q or port-based VLANs
are enabled on your network, you must specify which VLANs can support multicast traffic. Choose
Configure 802.1Q
IGMP
or
Configure Port-based IGMP
depending on the type of VLANs you are using.