User's Manual

Table Of Contents
327
Users Manual of CS-6306R
Chapter 32. MLD-Snooping Configuration
MLD-Snooping Configuration 32.1
32.1.1 IPv6 Multicast Overview
The task of MLD snooping is to maintain the forwarding relationship of IPv6 group addresses in VLAN and
synchronize with the change of the multicast group, enabling the data to be forwarded according to the
topology of the multicast group. Its functions include monitoring MLD-snooping packets, maintaining the table
between group address and VLAN, keep the MLD-snooping host the same with the MLD-snooping router and
solve the flooding problems.
When a L2 device has not got MLD snooping run, the multicast data will be broadcast at the second layer;
when the L2 device gets MLD snooping run, the multicast data of the known multicast group will not be
broadcast at the second layer but be sent to the designated receiver, and the unknown multicast data will be
dropped.
Because MLD-snooping solves the above-mentioned problems by monitoring the
Query or Report packets of MLD-Snooping, MLD snooping can work normally only
when there exists the multicast router.
32.1.2 MLD-Snooping Multicast Configuration Tasks
Enabling/Disabling MLD-Snooping
Enabling/Disabling the Solicitation of Hardware Forward of Multicast Group
Adding/Deleting the Static Multicast Address of VLAN
Setting Router Age Timer of MLD-Snooping
Setting Response Time Timer of MLD-Snooping
Setting the Port of the Static Multicast Router
Setting the Immediate Leave Function
Monitoring and Maintaining MLD-Snooping
32.1.2.1 Enabling/Disabling MLD-Snooping Multicast
Run the following commands in global configuration mode.
Command Purpose
ipv6 mld-snooping-snooping
Enables MLD snooping multicast.
no ipv6
mld-snooping-snooping
Disables MLD snooping.
After MLD-Snooping is enabled and the multicast packets fail to be found, the multicast packets whose
destination addresses are not registered are dropped.