Displaying And Maintaining Igmp Snooping - 3Com 7757 Configuration Manual

Configuring Multicast
VLAN
Displaying and
Maintaining IGMP
Snooping
If you configure IGMP Snooping simulated joining in Ethernet port view, the
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Ethernet port must belong to the specified VLAN; otherwise the configuration
does not take effect.
You can use the source-ip source-address command to specify a multicast
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source address that the port will join as a simulated host. This configuration
takes effect only when IMGPv3 Snooping is enabled in the VLAN.
In the current multicast mode, when users in different VLANs order the same
multicast packet, the multicast stream is copied to each of the VLANs. This mode
wastes a lot of bandwidth.
By configuring a multicast VLAN, adding switch ports to the multicast VLAN and
enabling IGMP Snooping, you can make users in different VLANs share the same
multicast VLAN. This saves bandwidth because multicast streams are transmitted
only within the multicast VLAN and also guarantees security because the multicast
VLAN is isolated from user VLANs completely. Therefore, multicast information
streams can be transmitted to users continuously if multicast VLAN is configured.
Perform the following configuration to configure multicast VLAN.
Table 349 Configure multicast VLAN
Operation
Enter system view
Enable the IGMP snooping function
globally
Enter VLAN view
Enable the IGMP snooping function
Enable the multicast VLAN function
Configure the mapping relationship
between multicast VLAN and multicast
sub-VLANs
c
CAUTION:
You can configure up to 5 multicast VLANs for the device.
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A multicast VLAN cannot be configured as a multicast sub-VLAN.
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A multicast sub-VLAN cannot be configured as a multicast VLAN.
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A multicast sub-VLAN cannot be configured as the sub-VLAN of another
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multicast VLAN.
A multicast sub-VLAN is corresponding to a multicast VLAN only.
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If multicast routing is enabled on a VLAN interface, the corresponding VLAN
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cannot be configured as a multicast VLAN.
After the configuration above, you can execute the display command to verify
the configuration by checking the displayed information.
You can execute the reset command to clear the statistics information about
IGMP Snooping.

Displaying and Maintaining IGMP Snooping

Command
system-view
igmp-snooping enable
vlan vlan-id
igmp-snooping enable
multicast-vlan enable
multicast-vlan vlan-id subvlan
vlan-list
437
Description
-
Required
-
Required
Required
Required