Mld Snooping Introduction - Edge-Core ES4626 User Manual

Function: Display the relevant MLD information of an interface
Parameter: <ifname> is the name of the interface . Display the MLD information of a
specific interface.
Default: Do not display
Command Mode: Admin Mode
Example: Display the MLD information of the Ethernet Interface vlan1
Switch#show ipv6 mld interface Vlan1
Interface Vlan1(2003)
Index 2003
Internet address is fe80::203:fff:fe01:e4a
MLD querier
MLD query interval is 100 seconds
MLD querier timeout is 205 seconds
MLD max query response time is 10 seconds
Last member query response interval is 1000 ms
Group membership interval is 210 seconds
MLD is enabled on interface
21.4 MLD Snooping

21.4.1 MLD Snooping Introduction

MLD, the Multicast Listener Discovery Protocol, is used to realize multicasting in the
IPv6. MLD is used by the network equipments such as routers which supports multicast
for multicast listener discovery, also used by listeners looking forward to join certain
multicast group informing the router to receive data packets from certain multicast
address, all of which are done through MLD message exchange. First the router send an
MLD Multicast listener Query message through a multicast address which can address
all the listeners (namely ff02::1). Once there is a listener who wishes to join the multicast
address, it will send a MLD Multicast listener Report back through the multicast address.
MLD Snooping is namely the MLD listening. The switch restricts the multicast traffic
from flooding through MLD Snooping, and forward the multicast traffic to ports associated
to multicast devices only. The switch listens to the MLD messages between multicast
routers and listeners, and maintains the multicast group forwarding list based on the
listening result. The switches forwards multicast packets according to the multicast
forwarding list
The switch realizes the MLD Snooping function while supporting MLD v2. This way,
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