Method and device for registering multicast source and establishing multicast path

A method for forwarding a multicast message, wherein the method comprises:

• after receiving a multicast message sent by a rendezvous point, a designated router DR to which a multicast listener belongs removing a multicast header of the multicast message to obtain an original multi cast message, and sending the original multicast message to the multicast listener, wherein, a target address of the removed multicast header is a multicast address, and a source address of the removed multicast header is a proxy care-of address of a multicast source;
• wherein a target address in the header of the original multicast message is the multicast address, and a source address in the header of the original multicast message is a home address of the multicast source;
• or,
• wherein the method comprises:
• after receiving an original multicast message sent by a multicast source, a designated router DR to which the multicast source belongs encapsulating another multicast header for the original multicast message, wherein a target address of the another multicast header is a multicast address G, and a source address of the another multicast header is a proxy care-of address S-pCoA of the multicast source;
• and forwarding a multicast message for which the another multicast header is encapsulated according to a generated (S-pCoA, G) multicast forwarding table entry, wherein, the multicast message reaches a rendezvous point along a shortest path tree SPT branch, and all routers passed along the SPT branch forward the multicast message for which the another multicast header is encapsulated according to the generated (S-pCoA, G) multicast forwarding table entry;
• or,
• wherein the method comprises:
• after receiving an original multicast message of a multicast source, a designated router DR to which the multicast source belongs encapsulating another multicast header for the multicast message, wherein a target address of the another multicast header is a multicast address G, and a source address of the another multicast header is a proxy care-of address S-pCoA of the multicast source;
• and
• according to a generated (S-pCoA, G) multicast forwarding table entry, through a shortest path tree SPT branch between the DR to which the multicast source belongs and a DR to which a multicast listener belongs, the DR to which the multicast source belongs forwarding a multicast message for which the another multicast header is encapsulated to the DR to which the multicast listener belongs;
• wherein, after receiving the multicast message, the DR to which the multicast listener belongs queries the generated (S-pCoA, G) multicast forwarding table entry to perform reverse path forwarding RPF check, after the check is passed, removes the another multicast header of the multicast message to obtain an original multicast message, and according to the generated (home address S-HoA of multicast source, G) forwarding table entry, sends the original multicast message to the multicast listener;
• or,
• wherein the method comprises:
• a border multicast router BMR receiving a multicast message for which another multicast header is encapsulated sent by a rendezvous point RP, wherein a target address of the another multicast header is a multicast address, and a source address of the another multicast header is a proxy care-of address of a multicast source;
• and
• the BMR looking up a binding relationship between a home address of the multicast source and the proxy care-of address of the multicast source according to the proxy care-of address of the multicast source, looking up a multicast forwarding table entry according to the home address of the multicast source, when outgoing interface information corresponding to the multicast forwarding table entry indicates that it is required to forward towards outward of a domain, decapsulating the another multicast header of an outer layer of the multicast message to obtain an original multicast message, and according to the outgoing interface information corresponding to the multicast forwarding table entry, sending the original multicast message to a designated router DR to which a multicast listener outside a domain belongs;
• or,
• wherein the method comprises:
• a border multicast router BMR receiving a multicast message for which another multicast header is encapsulated sent by a designated router DR to which a multicast source belongs, wherein a target address of the another multicast header is a multicast address G, and a source address of the another multicast header is a proxy care-of address S-pCoA of the multicast source;
• and
• the BMR decapsulating the another multicast header of an outer layer of the multicast message to obtain an original multicast message, querying a generated (S-pCoA, G) multicast forwarding table entry, and sending the original multicast message to a DR to which a multicast listener outside a domain belongs,
• wherein, before decapsulating the another multicast header of the outer layer of the multicast message, the BMR queries the (S-pCoA, G) multicast forwarding table entry, performs reverse path forwarding RPF check, and after the check is passed, decapsulates the another multicast header of the outer layer of the multicast message;
• or,
• wherein, the BMR receiving a multicast message for which another multicast header is encapsulated sent by an MAG to which a multicast source belongs comprises:
• after receiving the original multicast message sent by the multicast source, the DR to which the multicast source belongs encapsulating the another multicast header for the multicast message, and according to the generated (S-pCoA, G) multicast forwarding table entry, through a shortest path tree SPT branch between the DR to which the multicast source belongs and the BMR, sending the multicast message for which the another multicast header is encapsulated to the BMR.

A method for establishing a multicast path, wherein the method comprises:

• after receiving a registration message sent by a designated router DR to which a multicast source belongs, a rendezvous point removing an outer-layer encapsulation of the registration message to obtain a multicast message, and obtaining a multicast header of the multicast message, wherein a source address of the multicast header is a proxy care-of address S-pCoA of the multicast source, and a target address of the multicast header is a multicast address G, and the multicast message comprises an original multicast message, wherein a target address in the header of the original multicast message is the multicast address, and a source address in the header of the original multicast message is a home address of the multicast source;
• and
• the rendezvous point sending a join message to the DR to which the multicast source belongs, and establishing a shortest path tree SPT branch between the rendezvous point and the DR to which the multicast source belongs, wherein, routers passed along the SPT branch generate a (S-pCoA, G) multicast forwarding table entry,
• wherein, the DR to which the multicast source belongs is a mobile access gateway MAG to which the multicast source belongs, and the proxy care-of address of the multicast source is an address of the MAG to which the multicast source belongs;
• or,
• wherein the method comprises:
• after receiving a message of applying for joining a channel sent by a multicast listener, a designated router DR to which the multicast listener belongs querying a local mobility anchor LMA to obtain a proxy care-of address S-pCoA of a multicast source, and generating a (S-pCoA, multicast address G) multicast forwarding table entry;
• and
• the DR to which the multicast listener belongs sending a channel subscribe message hop by hop in a multicast source direction corresponding to a channel (S-pCoA, G), and establishing a shortest path tree SPT branch between the DR to which the multicast listener belongs and a DR to which the multicast source belongs, wherein, routers passed along the SPT branch and the DR to which the multicast source belongs generate a (S-pCoA, G) multicast forwarding table entry;
• or,
• wherein the method comprises:
• after receiving a subscribe message sent by a multicast listener outside a domain of a multicast source, a border multicast router BMR looking up a binding relationship between a home address of the multicast source and a proxy care-of address S-pCoA of the multicast source according to the home address of the multicast source in the subscribe message, obtaining the S-pCoA of the multicast source, and generating a (S-pCoA, multicast group address G) multicast forwarding table entry;
• and
• the BMR sending a channel subscribe message hop by hop in a multicast source direction corresponding to a channel (S-pCoA, G), and establishing a shortest path tree SPT branch between the BMR and a designated router DR to which the multicast source belongs, wherein, routers passed along the SPT branch and the DR to which the multicast source belongs generate a (S-pCoA, G) multicast forwarding table entry;
• wherein, an outgoing interface list corresponding to the (S-pCoA, G) multicast forwarding table entry generated by the BMR is for interfaces for the BMR receiving the channel subscribe message;
• or,
• wherein the method comprises:
• after receiving a registration message of a multicast listener, a rendezvous point RP sending a join message with a protocol independent multicast PIM join attribute hop by hop in a multicast source direction, wherein a proxy care-of address of a multicast source is carried in the PIM join attribute;
• triggering a designated router DR to which the multicast source belongs and routers passed by the join message to perform reverse path forwarding RPF check according to the proxy care-of address of the multicast source carried in the PIM join attribute, and completing an establishment of a shortest path tree SPT branch between the RP and the DR to which the multicast source belongs;
• or,
• wherein the method comprises:
• after receiving a message of applying for joining a channel sent by a multicast listener, a designated router DR to which the multicast listener belongs sending a join message with a protocol independent multicast PIM join attribute hop by hop in a multicast source direction, wherein a proxy care-of address of a multicast source is carried in the PIM join attribute;
• triggering a DR to which the multicast source belongs and routers passed by the join message to perform reverse path forwarding RPF check according to the proxy care-of address of the multicast source carried in the PIM join attribute, and completing an establishment of a shortest path tree SPT branch between the DR to which the multicast listener belongs and the DR to which the multicast source belongs;
• wherein, after receiving a multicast message sent by the multicast source, through the SPT branch between the DR to which the multicast source belongs and the DR to which the multicast listener belongs, the DR to which the multicast source belongs forwards the multicast message to the DR to which the multicast listener belongs, wherein, all routers along the SPT branch perform reverse path forwarding RPF check according to the proxy care-of address of the multicast source;
• or,
• wherein the method comprises:
• after receiving a channel subscribe message sent by a multicast listener outside a domain of a multicast source, according to a home address of the multicast source, a local mobility anchor LMA looking up a local binding cache table entry to obtain a proxy care-of address corresponding to the home address of the multicast source;
• and
• the LMA adding a protocol independent multicast PIM join attribute into the channel subscribe message, wherein the proxy care-of address of the multicast source is carried in the PIM join attribute;
• sending a channel subscribe message in which the PIM join attribute is added hop by hop in a multicast source direction, triggering a designated router DR to which the multicast source belongs and routers passed by the channel subscribe message to perform RPF check according to the proxy care-of address of the multicast source, and completing an establishment of a shortest path tree SPT branch between the LMA and the DR to which the multicast source belongs;
• wherein,
• after receiving an original multicast message sent by the multicast source, the DR to which the multicast source belongs forwards the original multicast message to the LMA through the SPT branch between the DR to which the multicast source belongs and the LMA, wherein, all routers along the SPT branch perform RPF check according to the proxy care-of address of the original multicast source and forward the original multicast message;
• and
• after receiving the original multicast message, the LMA forwards the original multicast message to a DR to which the multicast listener belongs.

A device for registering a multicast source, wherein the device comprises:

• a receiving unit, an encapsulating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive an original multicast message of the multicast source;
• the encapsulating unit is configured to:
• encapsulate another multicast header for the original multicast message, wherein a target address of the another multicast header is a multicast address, and a source address of the another multicast header is a proxy care-of address of the multicast source;
• and encapsulate the re-encapsulated multicast message into a registration message;
• and
• the sending unit is configured to:
• send the registration message to a rendezvous point,
• wherein, a target address in the header of the original multicast message is the multicast address, and a source address in the header of the original multicast message is a home address of the multicast source;
• the proxy care-of address of the multicast source is an address of a mobile access gateway MAG to which the multicast source belongs;
• or,
• wherein the device comprises:
• a registration unit, wherein, the registration unit is configured to:
• register a binding relationship between a home address of the multicast source and a proxy care-of address of the multicast source to a border multicast router BMR, and complete a registration of the binding relationship between the home address of the multicast source and the proxy care-of address of the multicast source;
• or,
• wherein the device comprises:
• a receiving unit, an encapsulating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive an original multicast message of a multicast source;
• the encapsulating unit is configured to:
• encapsulate the original multicast message as a registration message;
• and
• the sending unit is configured to:
• send the registration message to a rendezvous point RP, wherein a proxy care-of address of the multicast source and a path establishment flag bit are carried in the registration message, the path establishment flag bit is used for indicating the RP to establish a shortest path tree SPT branch between the RP and a designated router DR to which the multicast source belongs according to the proxy care-of address of the multicast source.

A device for forwarding a multicast message, wherein the device comprises:

• a receiving unit, a decapsulating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a multicast message sent by a rendezvous point;
• the decapsulating unit is configured to:
• remove a multicast header of the multicast message to obtain an original multicast message, wherein, a target address of the removed multicast header is a multicast address, and a source address of the removed multicast header is a proxy care-of address of a multicast source;
• and
• the sending unit is configured to:
• send the original multicast message to a multicast listener,
• wherein a target address in the header of the original multicast message is the multicast address, and a source address in the header of the original multicast message is a home address of the multicast source;
• or,
• wherein the device comprises:
• a receiving unit, an encapsulating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive an original multicast message sent by a multicast source;
• the encapsulating unit is configured to:
• encapsulate another multicast header for the multicast message, wherein a target address of the another multicast header is a multicast address G, and a source address of the another multicast header is a proxy care-of address S-pCoA of the multicast source;
• and
• the sending unit is configured to:
• forward a multicast message for which the another multicast header is encapsulated according to a generated (S-pCoA, G) multicast forwarding table entry, wherein, the multicast message reaches a rendezvous point along a shortest path tree SPT branch, and all routers passed along the SPT branch forward the multicast message for which the another multicast header is encapsulated according to the generated (S-pCoA, G) multicast forwarding table entry,
• or,
• wherein the device comprises:
• a receiving unit, an encapsulating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive an original multicast message of a multicast source;
• the encapsulating unit is configured to:
• encapsulate another multicast header for the multicast message, wherein a target address of the another multicast header is a multicast address G, and a source address of the another multicast header is a proxy care-of address S-pCoA of the multicast source;
• and
• the sending unit is configured to:
• according to a generated (S-pCoA, G) multicast forwarding table entry, through a shortest path tree SPT branch between with a designated router DR to which a multicast listener belongs, forward a multicast message for which the another multicast header is encapsulated to the DR to which the multicast listener belongs,
• or,
• wherein the device comprises:
• a receiving unit, a decapsulating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a multicast message;
• the decapsulating unit is configured to:
• query a generated (S-pCoA, G) multicast forwarding table entry to perform reverse path forwarding RPF check, after the check is passed, remove a multicast header of the multicast message to obtain an original multicast message;
• and
• the sending unit is configured to:
• according to the generated (home address S-HoA of multicast source, G) forwarding table entry, send the original multicast message to a multicast listener,
• or,
• wherein the device comprises:
• a receiving unit, a decapsulating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a multicast message for which another multicast header is encapsulated sent by a rendezvous point RP, wherein a target address of the another multicast header is a multicast address, and a source address of the another multicast header is a proxy care-of address of a multicast source;
• and
• the decapsulating unit is configured to:
• look up a binding relationship between a home address of the multicast source and the proxy care-of address of the multicast source according to the proxy care-of address of the multicast source, looking up a multicast forwarding table entry according to the home address of the multicast source, and when outgoing interface information corresponding to the multicast forwarding table entry indicates that it is required to forward towards outward of a domain, decapsulate the another multicast header of an outer layer of the multicast message to obtain an original multicast message;
• and
• the sending unit is configured to:
• according to the outgoing interface information corresponding to the multicast forwarding table entry, send the original multicast message to a designated router DR to which a multicast listener outside a domain belongs,
• or,
• wherein the device comprises:
• a receiving unit, a decapsulating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a multicast message for which another multicast header is encapsulated sent by a designated router DR to which a multicast source belongs, wherein a target address of the another multicast header is a multicast address G, and a source address of the another multicast header is a proxy care-of address S-pCoA of the multicast source;
• the decapsulating unit is configured to:
• decapsulate the another multicast header of an outer layer of the multicast message to obtain an original multicast message;
• and
• the sending unit is configured to:
• query a generated (S-pCoA, G) multicast forwarding table entry, and send the original multicast message to a DR to which a multicast listener outside a domain belongs.

A device for establishing a multicast path, wherein the device comprises:

• a receiving unit, a decapsulating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a registration message sent by a designated router DR to which a multicast source belongs;
• the decapsulating unit is configured to:
• remove an outer-layer encapsulation of the registration message to obtain a multicast message, and obtain a multicast header of the multicast message, wherein a source address of the multicast header is a proxy care-of address S-pCoA of the multicast source, and a target address of the multicast header is a multicast address G, and the multicast message comprises an original multicast message, wherein a target address in the header of the original multicast message is the multicast address, and a source address in the header of the original multicast message is a home address of the multicast source;
• and
• the sending unit is configured to:
• send a join message to the DR to which the multicast source belongs, and establish a shortest path tree SPT branch between with the DR to which the multicast source belongs, wherein, routers passed along the SPT branch generate a (S-pCoA, G) multicast forwarding table entry,
• or,
• wherein the device comprises:
• a receiving unit, a table entry generating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a message of applying for joining a channel sent by a multicast listener;
• the table entry generating unit is configured to:
• query a local mobility anchor LMA to obtain a proxy care-of address S-pCoA of a multicast source, and generate a (S-pCoA, multicast address G) multicast forwarding table entry;
• and
• the sending unit is configured to:
• send a channel subscribe message hop by hop in a multicast source direction corresponding to a channel (S-pCoA, G), and establish a shortest path tree SPT branch between with a designated router DR to which the multicast source belongs, wherein, routers passed along the SPT branch and the DR to which the multicast source belongs generate a (S-pCoA, G) multicast forwarding table entry,
• or,
• wherein the device comprises:
• a receiving unit, a table entry generating unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a subscribe message sent by a multicast listener outside a domain of a multicast source;
• the table entry generating unit is configured to:
• look up a binding relationship between a home address of the multicast source and a proxy care-of address S-pCoA of the multicast source according to the home address of the multicast source in the subscribe message, obtain the S-pCoA of the multicast source, and generate a (S-pCoA, multicast group address G) multicast forwarding table entry;
• and
• the sending unit is configured to:
• send a channel subscribe message hop by hop in a multicast source direction corresponding to a channel (S-pCoA, G), and establish a shortest path tree SPT branch between with a designated router DR to which the multicast source belongs, wherein, routers passed along the SPT branch and the DR to which the multicast source belongs generate a (S-pCoA, G) multicast forwarding table entry,
• or,
• wherein the device comprises:
• a receiving unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a registration message of a multicast listener;
• and
• the sending unit is configured to:
• send a join message with a protocol independent multicast PIM join attribute hop by hop in a multicast source direction, wherein a proxy care-of address of a multicast source is carried in the PIM join attribute;
• trigger a designated router DR to which the multicast source belongs and routers passed by the join message to perform reverse path forwarding RPF check according to the proxy care-of address of the multicast source carried in the PIM join attribute, and complete an establishment of a shortest path tree SPT branch between with the DR to which the multicast source belongs,
• or,
• wherein the device comprises:
• a receiving unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a message of applying for joining a channel sent by a multicast listener;
• and
• the sending unit is configured to:
• send a join message with a protocol independent multicast PIM join attribute hop by hop in a multicast source direction, wherein a proxy care-of address of a multicast source is carried in the PIM join attribute;
• trigger a designated router DR to which the multicast source belongs and routers passed by the join message to perform reverse path forwarding RPF check according to the proxy care-of address of the multicast source carried in the PIM join attribute, and complete an establishment of a shortest path tree SPT branch between with the DR to which the multicast source belongs,
• or,
• wherein the device comprises:
• a receiving unit, a querying unit and a sending unit, wherein:
• the receiving unit is configured to:
• receive a channel subscribe message sent by a multicast listener outside a domain of a multicast source;
• the querying unit is configured to:
• according to a home address of the multicast source, look up a local binding cache table entry to obtain a proxy care-of address corresponding to the home address of the multicast source, and add a protocol independent multicast PIM join attribute into the channel subscribe message, wherein the proxy care-of address of the multicast source is carried in the PIM join attribute;
• and
• the sending unit is configured to:
• send a channel subscribe message in which the PIM join attribute is added hop by hop in a multicast source direction, trigger a designated router DR to which the multicast source belongs and routers passed by the channel subscribe message to perform RPF check according to the proxy care-of address of the multicast source, and complete an establishment of a shortest path tree SPT branch between with the DR to which the multicast source belongs.