R21xx-HP FlexFabric 11900 IP Multicast Configuration Guide

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Enabling dropping unknown IPv6 multicast data
Unknown IPv6 multicast data refers to IPv6 multicast data for which no forwarding entries exist in the
MLD snooping forwarding table. When the switch receives such multicast data, one of the following
occurs:
• When the function of dropping unknown IPv6 multicast data is disabled, the switch floods unknown
IPv6 multicast data in the VLAN to which the unknown IPv6 multicast data belongs.
• When the function of dropping unknown IPv6 multicast data is enabled, the switch forwards
unknown multicast data to its router ports instead of flooding it in the VLAN. If no router ports exist,
the switch drops the unknown multicast data.
To enable dropping unknown IPv6 multicast data for a VLAN:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter VLAN view.
vlan vlan-id N/A
3. Enable dropping unknown
IPv6 multicast data for the
VLAN
mld-snooping drop-unknown
By default, this function is disabled.
Unknown IPv6 multicast data is
flooded.
Setting the maximum number of IPv6 multicast groups on a port
You can set the maximum number of IPv6 multicast groups on a port to regulate the port traffic.
When you set the maximum number of IPv6 multicast groups on a port, follow these guidelines:
• This configuration is effective for the IPv6 multicast groups that the port dynamically joins. If you
configure the port as a static member port for an IPv6 multicast group, this configuration is not
effective for the multicast group.
• If the number of IPv6 multicast groups on a port exceeds the limit, the system removes all the
forwarding entries related to that port from the MLD snooping forwarding table. In this case, the
receiver hosts attached to that port can join IPv6 multicast groups again before the number of IPv6
multicast groups on the port reaches the limit.
To set the maximum number of IPv6 multicast groups on a port:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view.
interface interface-type
interface-number
N/A
3. Set the maximum number of
IPv6 multicast groups on a
port.
mld-snooping group-limit limit
[ vlan vlan-list ]
The default setting is
4294967295.