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With the MLD SSM mapping feature configured, when Router A receives an MLDv1 report, it checks the
IPv6 multicast group address G carried in the message.
• If G is not in the IPv6 SSM group range, Router A cannot provide the SSM service but can provide
the ASM service.
• If G is in the IPv6 SSM group range but no MLD SSM mappings have been configured for the IPv6
multicast group G on Router A, Router A cannot provide SSM service and drops the packet.
• If G is in the IPv6 SSM group range, and the MLD SSM mappings have been configured on Router
A for multicast group G, Router A translates the (*, G) information in the MLD report into (G,
INCLUDE, (S1, S2...)) information based on the configured MLD SSM mappings and provides SSM
service accordingly.
NOTE:
The MLD SSM mapping feature does not process MLDv2 reports.
For more information about the IPv6 SSM group range, see "Configuring IPv6 PIM (available only on the
S5500-EI)."
MLD proxying
In some simple tree-shaped topologies, you do not need to configure complex IPv6 multicast routing
protocols, such as IPv6 PIM, on the boundary devices. Instead, you can configure MLD proxying on these
devices. With MLD proxying configured, the device serves as a proxy for the downstream hosts to send
MLD messages, maintain group memberships, and implement IPv6 multicast forwarding based on the
memberships. In this case, the MLD proxy device is a host but no longer an IPv6 PIM neighbor to the
upstream device.
Figure 88 Network diagram
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