R3303-HP HSR6800 Routers IP Multicast Configuration Guide

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Setting 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 age out or are manually removed.
When you are setting this upper limit, if the total number of the entries exceeds the value that you set, the
system informs you to remove excessive entries. In this case, the system does not automatically remove
any existing entries or create new entries.
To set the maximum number of entries in the forwarding table:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Set the maximum number of
forwarding entries in a
multicast VLAN.
multicast-vlan entry-limit limit The default upper limit is 1000.
Displaying and maintaining a multicast VLAN
Task Command Remarks
Display information about a
multicast VLAN.
display multicast-vlan [ vlan-id ] [ |
{ begin | exclude | include }
regular-expression ]
Available in any view.
Multicast VLAN configuration examples
This section provides examples of configuring multicast VLANs.
Sub-VLAN-based multicast VLAN configuration example
Network requirements
As shown in Figure 111, Router A and Router B are routers installed with the SAP modules. IGMPv2 runs
on Layer 3 device Router A, and IGMPv2 snooping runs on Layer 2 device Router B. Router A acts as the
IGMP querier.
The multicast source sends multicast data to the multicast group 224.1.1.1. Host A, Host B, and Host C are
receivers. They belong to VLAN 2 through VLAN 4, respectively.
Configure the sub-VLAN-based multicast VLAN feature on Router B so that Router A just sends the
multicast data to Router B through the multicast VLAN and Router B forwards the multicast data to the
receivers in different VLANs.