HP HP 830 Series, Configuration Manual

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Table 81 Configuration items
Item Description
Port
Select the port on which advanced IGMP snooping features will be configured. The port
can be an Ethernet port or Layer-2 aggregate port.
After a port is selected, advanced features configured on this port are displayed at the
lower part of this page.
TIP:
The advanced IGMP snooping configurations on a Layer 2 aggregate port do not interfere
with those configured on its member ports, nor do they participate in aggregation
calculations. The configuration on a member port of the aggregate group does not take effect
until the port leaves the aggregate group.
VLAN ID
Specify a VLAN in which you can configure the fast-leave function for the port or the
maximum number of multicast groups allowed on the port.
The configurations made in a VLAN take effect for the ports only in this VLAN.
Group Limit
Configure the maximum number of multicast groups that the port can join.
With this feature, you can limit multicast traffic on the port.
IMPORTANT:
You can enable IGMP snooping fast-leave processing on a port that has only one receiver
host attached to save bandwidth and resources. If a port has multiple hosts attached and the
function of dropping unknown multicast packets has been enabled on the switch or in the
VLAN where the port resides, you should not enable IGMP snooping fast-leave processing
on this port because other hosts attached to this port in the same multicast group cannot
receive the multicast data for the group.
Fast Leave
Enable or disable the fast-leave function for the port.
With the fast-leave function enabled on a port, the switch immediately deletes that port
from the corresponding forwarding entry after receiving an IGMP leave message on the
port. Then, when receiving IGMP group-specific queries for that multicast group, the
switch will not forward them to that port. In a VLAN where only one host is attached to
each port, the fast-leave function helps improve bandwidth and resource usage.
IMPORTANT:
If fast-leave is enabled for a port to which more than one host is attached, when one host
leaves a multicast group, the other hosts listening to the same multicast group cannot receive
the multicast data destined for the multicast group.
Displaying IGMP snooping multicast table entries
1. Select Network > IGMP snooping from the navigation tree.
2. Click Show Entries to display information about IGMP snooping multicast table entries.