3Com S7902E, Configuration Manual

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1-7
Configuring the Maximum Number of Forwarding Entries in a
Multicast VLAN
You can configure the maximum number of entries in the IGMP Snooping forwarding table of a multicast
VLAN. When the number of forwarding entries maintained for a multicast VLAN reaches the threshold,
the device creates no more forwarding entries until some entries time out or get manually removed.
Follow these steps to configure the maximum number of entries in the forwarding table
To do... Use the command... Remarks
Enter system view
system-view
—
Configure the maximum
number of forwarding entries in
a multicast VLAN
multicast-vlan entry-limit limit
Required
1000 by default.
If the number of existing entries in the IGMP Snooping forwarding table of a multicast VLAN is larger
than the limit when you configure it, the system informs you to remove excessive entries. In this case,
the system does not automatically remove any existing entries or create new entries.
Displaying and Maintaining Multicast VLAN
To do… Use the command… Remarks
Display information about a
multicast VLAN display multicast-vlan
[ vlan-id ]
Available in any view
Multicast VLAN Configuration Examples
Sub-VLAN-Based Multicast VLAN Configuration
Network requirements
z
Router A connects to a multicast source through GigabitEthernet2/0/1 and to Switch A, through
GigabitEthernet 2/0/2.
z
IGMPv2 is required on Router A, and IGMPv2 Snooping is required on Switch A. Router A is the
IGMP querier.
z
Switch A’s GigabitEthernet 2/0/1 belongs to VLAN 10, GigabitEthernet 2/0/2 through
GigabitEthernet2/0/4 belong to VLAN 2 through VLAN 4 respectively, and Host A through Host C
are attached to GigabitEthernet 2/0/2 through GigabitEthernet 2/0/4 of Switch A respectively.
z
The multicast source sends multicast data to multicast group 224.1.1.1. Host A, Host B, and Host C
are receivers of the multicast group.