H3C S5500-EI User Manual

284
NOTE:
Some models of devices, when enabled to filter IPv6 multicast data based on the source ports, are
automatically enabled to filter IPv4 multicast data based on the source ports.
Enabling dropping unknown IPv6 multicast data
Unknown IPv6 multicast data refers to IPv6 multicast data for which no entries exist in the MLD snooping
forwarding table. When the switch receives such IPv6 multicast traffic, 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.
Configuration procedure
To enable dropping unknown IPv6 multicast data in 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.
mld-snooping drop-unknown Disabled by default
Configuring MLD report suppression
When a Layer 2 switch receives an MLD report from an IPv6 multicast group member, the Layer 2 switch
forwards the message to the Layer 3 device that directly connects to the Layer 2 switch. When multiple
members of an IPv6 multicast group are attached to the Layer 2 switch, the Layer 3 device might receive
duplicate MLD reports for the IPv6 multicast group from these members.
With the MLD report suppression function enabled, within a query interval, the Layer 2 switch forwards
only the first MLD report for the IPv6 multicast group to the Layer 3 device. It does not forward subsequent
MLD reports for the same IPv6 multicast group to the Layer 3 device. This helps reduce the number of
packets being transmitted over the network.
On an MLD snooping proxy, MLD reports for an IPv6 multicast group from downstream hosts are
suppressed if the forwarding entry for the multicast group exists on the proxy, whether the suppression
function is enabled or not.
To configure MLD report suppression:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A

H3C S5500-EI Specifications

General

Brand	H3C
Model	S5500-EI
Category	Switch
Language	English