D-Link DGS-3200-10 Product Manual - Page 110

xStack® DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch MLD Control Messages Three t ypes of m essages are t ransferred be tween de vices usi ng M LD snooping. T hese t hree m essages are al l de fined by f our ICMPv6 packet headers, labeled 130, 131, 132, and 143. 1. Multicast Listener Query - Sim ilar to th e IGMPv 2 Host Mem bership Query fo r IPv4, an d labeled as 130 in th e ICMPv6 packet header, this message is sent by the router to ask if an y link is requ esting multicast data. There are two types of MLD query messages emitted by the router. The General Query is used to advertise all multicast addresses that are read y to send m ulticast data to all listen ing ports, and the M ulticast Specific query, which a dvertises a s pecific multicast ad dress th at is also read y. Th ese two typ es of messages are distinguished by a m ulticast d estination add ress located in the IPv6 header and a multicast address in the Multicast Listener Query Message. 2. Multicast Listener Report, Version 1 - Comparable to the Host Membership Report in IGMPv2, and labeled as 131 in the ICMP packet header, this message is s ent by the listening port to the Switc h stating that it is inte rested in receiving multicast data from a multicast address in response to the Multicast Listener Query message. 3. Multicast Listener Done - Akin to th e Leav e Group Messag e in IGMPv2, and lab eled as 132 in the ICMPv6 p acket header, this message is sent by the multicast listening port stating that it is no longer interested in receiving multicast data from a specific multicast group address, therefore stating that it is "done" with the multicast data from this address. Once this message is received by the Switch, it will no longer forward multicast traffic from a specific multicast group address to this listening port. 4. Multicast Listener Report, Version 2 - Comparable to the Host Membership Report in IGMPv3, and labeled as 143 in the ICMP packet header, this message is s ent by the listening port to the Switc h stating that it is inte rested in receiving multicast data from a multicast address in response to the Multicast Listener Query message. Users can configure the settings for MLD snooping. To view the following window, click L2 Features > MLD Snooping Settings: Figure 3 - 37. MLD Snooping Settings window This window displays the current MLD Snooping settings set on the Switch, defined by VLAN. The following parameters may be viewed: Parameter Description VID This is the VLAN ID that, along with the VLAN Name, identifies the VLAN for which to modify the MLD Snooping Settings. VLAN Name This is the VLAN Name that, along with the VLAN ID, identifies the VLAN for which to modify the MLD Snooping Settings. Done Timer Specifies the maximum amount of time a group will remain in the Switch after receiving a 'Done' message from the group, without receiving a 'node listener' report. The user may specify a time between 1 and 16711450 with a default setting of 2 seconds. Node Timeout Specifies the link node timeout, in seconds. After this timer expires, this node will no longer be considered as listening node. The user may specify a time between 1 and 16711450 with a default setting of 260 seconds. Router Timeout Specifies the maximum amount of time a dynamically learned router port will remain in the Switch's routing table, before it times out. The user may specify a time between 1 and 16711450 with a default setting of 260 seconds. 97