4-3z Whenever mentioned in this document, a router port is a router-connecting port on the switch,rather than a port on a router.z Unless otherwise specified, router/member ports mentioned in this document include static anddynamic ports.z On an MLD Snooping-enabled switch, the ports that received MLD general queries with thesource address other than 0::0 or IPv6 PIM hello messages are dynamic router ports.Aging timers for dynamic ports in MLD SnoopingTable 4-1 Aging timers for dynamic ports in MLD Snooping and related messages and actionsTimer Description Message beforeexpiry Action after expiryDynamic routerport aging timerFor each dynamic routerport, the switch sets a timerinitialized to the dynamicrouter port aging time.MLD general query ofwhich the sourceaddress is not 0::0 orIPv6 PIM hello.The switch removesthis port from its routerport list.Dynamicmember portaging timerWhen a port dynamicallyjoins an IPv6 multicastgroup, the switch sets atimer for the port, which isinitialized to the dynamicmember port aging time.MLD report message.The switch removesthis port from the MLDSnooping forwardingtable.The port aging mechanism of MLD Snooping works only for dynamic ports; a static port will never ageout.How MLD Snooping WorksA switch running MLD Snooping performs different actions when it receives different MLD messages,as follows:The description about adding or deleting a port in this section is only for a dynamic port. Static portscan be added or deleted only through the corresponding configurations. For details, see ConfiguringStatic Ports.
