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Home › Networking Technologies › Networking TCP/IP › An IPv6 Deployment Guide › Chapter 8: The differences between IPv4 and IPv6 multicast

8.4.1.1 Recall of the IPv4 Model

Here we will describe how inter-domain any-source multicast is done with IPv4. This differs quite a bit from how it is done with IPv6. For source-specific multicast there is no difference.

For both IPv4 and IPv6, PIM-SM is the most common multicast routing protocol. PIM-SM ensures that when a host in a domain joins a group, a shared tree is built from the RP in that domain, and also when a host in the domain is sending, the RP in that domain receives the data and is aware of the source. Doing this, PIM-SM can provide connectivity between sources and listeners when they are using the same RP. So by only using PIM-SM, it is necessary that all sources and receivers use the same RP.

For IPv6 this is basically how inter-domain ASM multicast is done with the Embedded-RP solution. For IPv4 however, there is a protocol called MSDP [RFC3618] that provides for communication between RPs in different domains. Using MSDP each multicast domain can have its own RP for groups of global scope, and a listener in one domain is able to receive from a source in another.

Here we will describe how inter-domain any-source multicast is done with IPv4. This differs quite a bit from how it is done with IPv6. For source-specific multicast there is no difference. For both IPv4 and IPv6, PIM-SM is the most common multicast routing protocol. PIM-SM ensures that when a host in a domain joins a group, a shared tree is built from the RP in that domain, and also when a host in the domain is sending, the RP in that domain receives the data and is aware of the source. Doing this, PIM-SM can provide connectivity between sources and listeners when they are using the same RP. So by only using PIM-SM, it is necessary that all sources and receivers use the same RP.

For IPv6 this is basically how inter-domain ASM multicast is done with the Embedded-RP solution. For IPv4 however, there is a protocol called MSDP [RFC3618] that provides for communication between RPs in different domains. Using MSDP each multicast domain can have its own RP for groups of global scope, and a listener in one domain is able to receive from a source in another.
‹ 8.4.1 The ASM Caseup8.4.1.2 The Embedded RP Solution for IPv6 ›