3com S7906E 설치 설명서

 

1-4 

1)  This host sends an MLD done message to all IPv6 multicast routers (the destination address is 

FF02::2) on the local subnet.  

2)  Upon receiving the MLD done message, the querier sends a configurable number of 

multicast-address-specific queries to the group being left. The destination address field and group 

address field of the message are both filled with the address of the IPv6 multicast group being 

queried.  

3)  One of the remaining members, if any on the subnet, of the group being queried should send a 

report within the time of the maximum response delay set in the query messages.  

4)  If the querier receives a report for the group within the maximum response delay time, it will 

maintain the memberships of the IPv6 multicast group; otherwise, the querier will assume that no 

hosts on the subnet are still interested in IPv6 multicast traffic addressed to that group and will stop 

maintaining the memberships of the group.  

Compared with MLDv1, MLDv2 provides the following new features:  

MLDv2 has introduced IPv6 multicast source filtering modes (Include and Exclude), so that a host can 

specify a list of IPv6 multicast sources it expect or does not expect IPv6 multicast data from when it joins 

an IPv6 multicast group:  

z 

If it expects IPv6 multicast data from specific IPv6 multicast sources like S1, S2, …, it sends a 

report with the Filter-Mode denoted as “Include Sources (S1, S2, …).  

z 

If it does not expect IPv6 multicast data from specific IPv6 multicast sources like S1, S2, …, it 

sends a report with the Filter-Mode denoted as “Exclude Sources (S1, S2, …).  

As shown in 

, the network comprises two IPv6 multicast sources, Source 1 (S1) and Source 2 

(S2), both of which can send IPv6 multicast data to IPv6 multicast group G. Host B is interested only in 

the IPv6 multicast data that Source 1 sends to G but not in the data from Source 2.  

Figure 1-2 Flow paths of multicast-address-and-source-specific multicast traffic 

Host A

Host B

Host C

Packets (S1,G)

Packets (S2,G)

 

 

In the case of MLDv1, Host B cannot select IPv6 multicast sources when it joins IPv6 multicast group G. 

Therefore, IPv6 multicast streams from both Source 1 and Source 2 will flow to Host B whether it needs 

them or not.