Advanced multicast support for cable

• US 7,701,938 B1
• Filed: 12/01/2005
• Issued: 04/20/2010
• Est. Priority Date: 12/13/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Eckert, Toerless, Bernstein, Alon Shlomo, Parandekar, Harsh
• Primary Examiner(s): HO, DUC CHI
• Application Number:
  US11/292,725
• Time in Patent Office: 1,601 Days
• Field of Search: None
• US Class Current: 370/390
• CPC Class Codes: H04L 12/185 with management of multicast group membership
• CPC Class Codes: H04L 47/10 Flow control; Congestion control

Abstract

Embodiments may comprise a cable network that shifts control plane functionality for multicast sessions to a cable modem termination system allowing multicast without a cable modem snooping messages from a coupled device. Another embodiment may comprise a network including a device to generate a request to join a multicast session over a cable network, a cable modem termination system in communication with the device, the cable modem termination system to receive the request from the device and to generate a flow identifier to associate with the multicast session, and a cable modem in communication with the cable modem termination system and the device, the cable modem to receive the flow identifier from the cable modem termination system and forward the multicast session to the device from the cable modem termination system based on the flow identifier. Other embodiments may comprise an apparatus that has a port to receive a request from a cable modem to join a multicast session, and circuitry to generate a flow identifier to associate with the multicast session and communicate the flow identifier to the cable modem to allow the cable modem to forward the multicast session to a device.

Claims

1. A network comprising:

a device to generate a request to join a multicast session over a cable network;

a cable modem termination system in communication with the device, the cable modem termination system to receive the request from the device and to generate a flow identifier to associate with the multicast session; and

a cable modem in communication with the cable modem termination system and the device, the cable modem to receive the flow identifier from the cable modem termination system and forward the multicast session to the device from the cable modem termination system based on the flow identifier, wherein the cable modem termination system generates an explicit label in a DOCSIS header to use as the flow identifier to associate with the multicast session.

2. The network of claim 1 wherein the device generates an Internet Group Management Protocol (IGMP) join message as the request to join a multicast session over a cable network.

3. The network of claim 1 wherein the flow identifier is either a multicast address or a group of multicast addresses.

4. The network of claim 1 wherein the cable modem termination system assigns a unique MAC address from a generic pool to each unique multicast session as the flow identifier to associate with the multicast session, wherein the MAC address is used only on an RFI link.

5. The network of claim 1 wherein the cable modem termination system assigns a unique BPI key as the flow identifier for each unique multicast session.

6. An apparatus comprising:

a port to receive a request from a cable modem to join a multicast session; and

circuitry to;

generate a flow identifier to associate with the multicast session;

communicate the flow identifier to the cable modem to allow the cable modem to forward the multicast session to a device, wherein the circuitry can generate an explicit label in a DOCSIS header to use as the flow identifier to associate with the multicast session.

7. The apparatus of claim 6 wherein the port can receive an Internet Group Management Protocol (IGMP) join message as the request to join a multicast session over a cable network.

8. The apparatus of claim 6 wherein the flow identifier is either a multicast address or a group of multicast addresses.

9. The apparatus of claim 6 wherein the circuitry is to assign a unique MAC address from a generic pool to each unique multicast session as the flow identifier to associate with the multicast session, wherein the MAC address is used only on an RFI link.

10. The apparatus of claim 6 wherein the circuitry is to assign a unique BPI key as the flow identifier for each unique multicast session.

11. A method comprising:

receiving a request from a cable modem to join a multicast session;

generating a flow identifier to associate with the multicast session;

using a control plane protocol to communicate the flow identifier to the cable modem; and

forwarding the multicast session through the cable modem to a device, wherein generating a flow identifier includes generating an explicit label in a DOCSIS header to use as the flow identifier to associate with the multicast session.

12. The method of claim 11 wherein receiving a request includes receiving an Internet Group Management Protocol (IGMP) join message.

13. The method of claim 11 wherein the flow identifier is either a multicast address or a group of multicast addresses.

14. The method of claim 11 wherein generating a flow identifier includes assigning a unique MAC address from a generic pool as the flow identifier to associate with the multicast session, wherein the MAC address is used only on an RFI link.

15. The method of claim 11 wherein generating a flow identifier includes assigning a unique BPI key as the flow identifier for each unique multicast session.

16. An apparatus comprising:

means for receiving a request from a cable modem to join a multicast session;

means for generating a flow identifier to associate with the multicast session;

means for using a control plane protocol to communicate the flow identifier to the cable modem; and

means for forwarding the multicast session through the cable modem to a device, wherein means for generating a flow identifier includes means for generating an explicit label in a DOCSIS header to use as the flow identifier to associate with the multicast session.

17. The apparatus of claim 16 wherein means for receiving a request includes means for receiving an Internet Group Management Protocol (IGMP) join message.

18. The apparatus of claim 16 wherein the flow identifier is either a multicast address or a group of multicast addresses.

19. The apparatus of claim 16 wherein means for generating a flow identifier includes means for assigning a unique MAC address from a generic pool as the flow identifier to associate with the multicast session and the MAC address is used only on an RFI link.

20. The apparatus of claim 16 wherein means for generating a flow identifier includes means for assigning a unique BPI key as the flow identifier for each unique multicast session.

21. A computer readable medium containing instructions that when executed cause a cable modem termination system to:

receive a request from a cable modem to join a multicast session;

generate a flow identifier to associate with the multicast session;

use a control plane protocol to communicate the flow identifier to the cable modem;

forward the multicast session through the cable modem to a device; and

cause the cable modem termination system to generate an explicit label in a DOCSIS header to use as the flow identifier to associate with the multicast session.

22. The computer readable medium of claim 21 further comprising instructions that when executed further cause the cable modem termination system to receive an Internet Group Management Protocol (IGMP) join message as a request to join a multicast session.

23. The computer readable medium of claim 21 wherein the flow identifier is either a multicast address or a group of multicast addresses.

24. The computer readable medium of claim 21 further comprising instructions that when executed further cause the cable modem termination system to assign a unique MAC address from a generic pool as the flow identifier to associate with the multicast session, wherein the MAC address is used only on an RFI link.

25. The computer readable medium of claim 21 further comprising instructions that when executed further cause the cable modem termination system to assign a unique BPI key as the flow identifier for each unique multicast session.