H3C S5500-EI - MLD SSM Mapping

342
Field Descri
p
tion
Reserved
The Reserved fields are set to 0 on transmission and ignored on
reception.
Checksum Standard IPv6 checksum.
Number of Multicast Address Records
This field indicates how many IPv6 multicast address records are
present in this report message.
Multicast Address Record(i)
This field represents information of each IPv6 multicast address
the host listens to on the interface from which the report message
is sent, including record type, IPv6 multicast address, and IPv6
multicast source address on the sender. (i= 1, 2, ... m, where m
represents the number of IPv6 multicast address records).
MLD SSM mapping
The MLD SSM mapping feature enables you to configure static MLD SSM mappings on the last hop router
to provide SSM support for receiver hosts that are running MLDv1. The SSM model assumes that the last
hop router has identified the desired IPv6 multicast sources when receivers join IPv6 multicast groups.
• When an MLDv2 enabled host joins a multicast group, it can explicitly specify one or more multicast
sources in its MLDv2 report.
• An MLDv1-enabled host, however, cannot specify multicast source addresses in its MLDv1 report.
You must configure the MLD SSM mapping feature to translate the (*, G) information in the MLDv1
report into (G, INCLUDE, (S1, S2...)) information.
Figure 87 Network diagram
On the IPv6 SSM network in Figure 87, Host A and Host B are running MLDv1 and Host C is running
MLDv2. To provide SSM service for Host A and Host B, you must configure the MLD SSM mapping
feature on Router A.
MLDv1 report
MLDv2 report
Router A
Querier
Host A (MLDv1)
IPv6 SSM
Receiver
Host B (MLDv1)
Receiver
Host C (MLDv2)
Receiver