3com S7906E Instruccion De Instalación

 

1-15 

Before configuring MLD snooping querier, complete the following task:  

z 

Enable MLD snooping in the VLAN.  

Before configuring MLD snooping querier, prepare the following data:  

z 

MLD general query interval,  

z 

MLD last-member query interval,  

z 

Maximum response time for MLD general queries, 

z 

Source IPv6 address of MLD general queries, and  

z 

Source IPv6 address of MLD multicast-address-specific queries.  

In an IPv6 multicast network running MLD, a multicast router or Layer 3 multicast switch is responsible 

for sending periodic MLD general queries, so that all Layer 3 multicast devices can establish and 

maintain multicast forwarding entries, thus to forward multicast traffic correctly at the network layer. This 

router or Layer 3 switch is called MLD querier.  

However, a Layer 2 multicast switch does not support MLD, and therefore cannot send MLD general 

queries by default. By enabling MLD snooping querier on a Layer 2 switch in a VLAN where multicast 

traffic needs to be Layer-2 switched only and no Layer 3 multicast devices are present, the Layer 2 

switch will act as the MLD querier to send periodic MLD queries, thus allowing multicast forwarding 

entries to be established and maintained at the data link layer.  

Follow these steps to enable the MLD snooping querier:  

Enter system view 

— 

Enter VLAN view 

vlan vlan-id 

— 

Enable the MLD snooping 
querier 

Required 

Disabled by default 

 

It is meaningless to configure an MLD snooping querier in an IPv6 multicast network running MLD. 

Although an MLD snooping querier does not take part in MLD querier elections, it may affect MLD 

querier elections because it sends MLD general queries with a low source IPv6 address.  

For details about MLD querier, see MLD Configuration of the IP Multicast Volume. 

 

You can tune the MLD general query interval based on actual condition of the network.  

Upon receiving an MLD query (general query or multicast-address-specific query), a host starts a timer 

for each IPv6 multicast group it has joined. This timer is initialized to a random value in the range of 0 to