Facilitating accelerated processing of internet group management protocol messages

• US 7,272,652 B1
• Filed: 04/30/2002
• Issued: 09/18/2007
• Est. Priority Date: 04/30/2002
• Status: Active Grant

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Keller-Tuberg, Stefan
• Primary Examiner(s): Burgess; Glenton B.
• Assistant Examiner(s): REILLY, SEAN M
• Application Number:
  US10/136,581
• Time in Patent Office: 1,967 Days
• Field of Search: 709223-232, 370/390, 370/396
• US Class Current: 709/227
• CPC Class Codes: H04L 12/185 with management of multicast group membership

Abstract

Processing Internet Group Management Protocol (IGMP) messages in which a response-mode determination process is facilitated after receiving an IGMP Membership Report designating a requested multipoint leaf connection, where in a proactive expedited leave process is performed in response to determining that implementation of the requested multipoint leaf connection is required and that required network resources are unavailable. A multicast leaf connection implementation process for implementing the requested multipoint leaf connection is performed in response to determining that required network resources are available.

Claims

1. A method for processing Internet Group Management Protocol (IGMP) messages, comprising:

facilitating a response-mode determination process after receiving an IGMP Membership Report designating a requested multipoint leaf connection, comprising;

determining whether a multicast stream designated in the IGMP Membership Report is already active;

disregarding the IGMP Membership Report in response to determining that the multicast stream is active via a host designated in the IGMP Membership Report; and

identifying the host designated in the IGMP Membership Report as an alternate host for the multicast stream designated in the IGMP Membership Report in response to determining that the multicast stream is active via a different host than the host designated in the IGMP Membership Report;

performing a proactive expedited leave process in response to determining that implementation of the requested multipoint leaf connection is required and that required network resources are unavailable; and

performing a multicast leaf connection implementation process for implementing the requested multipoint leaf connection in response to determining that required network resources are available.

2. The method of claim 1 wherein determining whether the multicast stream designated in the IGMP Membership Report is already active includes assessing entries in a reference table identifying active multicast sessions.

3. The method of claim 2 wherein assessing entries includes assessing a host address, a particular class D address and a multicast subscriber identity.

4. The method of claim 3 wherein facilitating the response-mode determination process further includes canceling any active membership query timers associated with the particular class D address and multicast subscriber identity.

5. The method of claim 1 wherein identifying the host includes creating an entry in a reference table identifying active multicast sessions.

6. The method of claim 5 wherein creating the entry includes designating a host address, a particular class D address and a multicast subscriber identity.

7. The method of claim 1 wherein performing the proactive expedited leave process includes:

determining whether a host designated in the IGMP Membership Report is a sole member of at least one other multicast session;

terminating a chosen active leaf connection associated with said at least one other multicast session in response to determining that the host designated in the IGMP Membership Report is the sole member of said at least one other multicast session; and

removing an entry associated with the chosen active leaf connection from a reference table identifying active multicast sessions.

8. The method of claim 7, further comprising:

determining whether requested multipoint leaf connection is capable of being implemented after performing the proactive expedited leave process.

9. The method of claim 7 wherein the chosen active leaf connection is a highest bit rate active leaf connection.

10. The method of claim 1, further comprising:

performing a passive expedited leave process for leaving a multicast group corresponding to the requested multipoint leaf connection in response to implementing the requested multipoint leaf connection.

11. A method for processing Internet Group Management Protocol (IGMP) messages, comprising:

receiving an IGMP Membership Report designating a requested multipoint leaf connection;

assessing entries in a reference table identifying active multicast sessions for determining whether a multicast stream designated in the IGMP Membership Report is already active;

creating an entry in a reference table identifying active multicast sessions for identifying the host designated in the IGMP Membership Report as an alternate host for the multicast stream designated in the IGMP Membership Report in response to determining that the multicast stream is active via a different host than the host designated in the IGMP Membership Report;

determining whether a host designated in the IGMP Membership Report is a sole member of at least one other multicast session in response to determining that implementation of the requested multipoint leaf connection is required and that required network resources are unavailable;

terminating a highest bit rate active leaf connection associated with said at least one other multicast session in response to determining that the host designated in the IGMP Membership Report is the sole member of said at least one other multicast session;

removing an entry associated with the highest bit rate active leaf connection from a reference table identifying active multicast sessions; and

facilitating a multicast leaf connection implementation process for implementing the requested multipoint leaf connection in response to determining that required network resources are available.

12. A method for facilitating a proactive group membership leave process, comprising:

determining whether a host designated in the IGMP Membership Report is a sole member of at least one other multicast session after performing a first process for assessing connection admission;

terminating a chosen active leaf connection associated with said at least one other multicast session in response to determining that the host designated in the IGMP Membership Report is the sole member of said at least one other multicast session;

removing an entry associated with the highest bit rate active leaf connection from a reference table identifying active multicast sessions; and

performing a second process for assessing connection admission of the requested multipoint leaf connection after terminating the highest bit rate active leaf connection.

13. A computer-readable medium encoded with a data processor program for processing Internet Group Management Protocol (IGMP) messages, the data processor program enabling functionality comprising:

facilitating a response-mode determination process after receiving an IGMP Membership Report designating a requested multipoint leaf connection comprising;

determining whether a multicast stream designated in the IGMP Membership Report is already active;

disregarding the IGMP Membership Report in response to determining that the multicast stream is active via a host designated in the IGMP Membership Report; and

identifying the host designated in the IGMP Membership Report as an alternate host for the multicast stream designated in the IGMP Membership Report in response to determining that the multicast stream is active via a different host than the host designated in the IGMP Membership Report;

facilitating a proactive expedited leave process in response to determining that implementation of the requested multipoint leaf connection is required and that required network resources are unavailable; and

facilitating a multicast leaf connection implementation process for implementing the requested multipoint leaf connection in response to determining that required network resources are available.

14. The computer-readable medium of claim 13 wherein the data processor program further enabling functionality comprising assessing entries in a reference table identifying active multicast sessions.

15. The computer-readable medium of claim 14 wherein the data processor program further enabling functionality comprising assessing a host address, a particular class D address and a multicast subscriber identity.

16. The computer-readable medium of claim 14 wherein the data processor program further enabling functionality comprising canceling any active membership query timers associated with the particular class D address and the multicast subscriber identity.

17. The computer-readable medium of claim 13 wherein the data processor program further enabling functionality comprising creating an entry in a reference table identifying active multicast sessions.

18. The computer-readable medium of claim 17 wherein the data processor program further enabling functionality comprising designating a host address, a particular class D address and a multicast subscriber identity.

19. The computer-readable medium of claim 13 wherein the data processor program further enabling functionality comprising:

determining whether a host designated in the IGMP Membership Report is a sole member of at least one other multicast session;

terminating a chosen active leaf connection associated with said at least one other multicast session in response to determining that the host designated in the IGMP Membership Report is the sole member of said at least one other multicast session; and

removing an entry associated with the chosen active leaf connection from a reference table identifying active multicast sessions.

20. The computer-readable medium of claim 19 wherein the data processor program further enabling functionality comprising:

determining whether requested multipoint leaf connection is capable of being implemented after performing the proactive expedited leave process.

21. The computer-readable medium of claim 19 wherein the chosen active leaf connection is a highest bit rate active leaf connection.

22. The computer-readable medium of claim 13 wherein the data processor program further enabling functionality comprising:

facilitating a passive expedited leave process for leaving a multicast group corresponding to the requested multipoint leaf connection after implementing the requested multipoint leaf connection.