Granted Patent B2

US 12,549,402 · App. 18/754,568 · Granted Feb 10, 2026

Inventors: Tathagata Nandy (Bangalore, IN); Thomas Samuel (Bangalore, IN)

Assignee: Hewlett Packard Enterprise Development LP

H04L12/185H04L12/1881H04L12/4633

Abstract

Claims (65)

1 . A method, comprising:

sending, from a first border virtual tunneling endpoint (VTEP) device in a first fabric included in a virtual extensible local area network (VxLAN), a first protocol independent multicast sparse mode (PIM-SM) hello message to a second border VTEP device in a second fabric included in the VxLAN, the first PIM-SM hello message indicating that the first border VTEP device is a first rendezvous point (RP) for the first fabric;

receiving, by the first border VTEP device from the second border VTEP device, a second PIM-SM hello message indicating that the second border VTEP device is a second RP for the second fabric;

sending, from the first border VTEP device to the second border VTEP device, a first PIM-SM control message indicative of local PIM-SM sources in the first fabric, including a first PIM-SM source;

receiving, by the first border VTEP device from the second border VTEP device, a second PIM-SM control message indicative of remote PIM-SM sources in the second fabric;

receiving, by the first border VTEP device from a receiver designated router (DR) located in the first fabric and associated with a first PIM-SM receiver, a first PIM-SM join message indicating a PIM-SM group associated with the first PIM-SM source; and

forwarding, by the first border VTEP device to the receiver DR, a PIM-SM data stream from a source DR in the first fabric associated with the first PIM-SM source.

2 . The method of claim 1 , wherein, in response to receiving the first PIM-SM join message from the receiver DR, the method further comprises:

creating a rendezvous point tree (RPT) between the first border VTEP device and the receiver DR; and

forwarding the PIM-SM data stream to the receiver DR using the RPT.

3 . The method of claim 1 , further comprising:

receiving, by the first border VTEP device from the source DR, a PIM-SM register message indicating source information and group information for the first PIM-SM source.

4 . The method of claim 3 , wherein receiving the PIM-SM register message further comprises:

periodically receiving the PIM-SM register message while the PIM-SM data stream is forwarded to the receiver DR.

5 . The method of claim 4 , further comprising:

periodically resending the first PIM-SM hello message to the second border VTEP device; and

periodically receiving the second PIM-SM hello messages from the second border VTEP device.

6 . The method of claim 5 , further comprising:

after a timeout period expires without receiving the PIM-SM register message from the source DR, removing the source information and the group information for the first PIM-SM source from the first PIM-SM hello message.

7 . The method of claim 1 , further comprising:

sending, from the first border VTEP device to at least one network device at the first fabric, a third PIM-SM hello message indicating that the first border VTEP device is the first RP for the first fabric.

8 . A border network device, comprising:

a first network port for respectively establishing a virtual tunneling endpoint (VTEP) connection in a virtual extensible local area network (VxLAN);

a second network port for connecting to a first fabric of the VxLAN;

a memory; and

a controller having access to the first network port and the second network port and to the memory, the memory storing instructions executable by the controller to:

send, using the first network port to a second border network device at a second fabric of the VxLAN using the VTEP connection, a first protocol independent multicast sparse mode (PIM-SM) hello message indicating that the border network device is a first local rendezvous point (RP) in the first fabric;

receive, using the first network port from the second border network device using the VTEP connection, a second PIM-SM hello message indicating that the second border network device is a second local RP in the second fabric;

send, using the first network port to the second border network device using the VTEP connection, a first PIM-SM control message indicative of PIM-SM sources in the first fabric, including a first PIM-SM source;

receive, using the first network port from the second border network device using the VTEP connection, a second PIM control message indicative of remote PIM-SM sources in the second fabric;

receive, using the second network port from a receiver designated router (DR) located in the first fabric and associated with a first PIM-SM receiver, a PIM-SM join message indicating a PIM-SM group associated with the first PIM-SM source; and

forward, using the second network port to the receiver DR, a PIM-SM data stream received from a source DR in the first fabric associated with the first PIM-SM source.

9 . The border network device of claim 8 , further comprising instructions to:

in response to the PIM-SM join message from the receiver DR, create a rendezvous point tree (RPT) between the border network device and the receiver DR; and

forward the PIM-SM data stream using the RPT.

10 . The border network device of claim 8 , further comprising instructions to:

receive, using the second network port from the source DR, a PIM-SM register message indicating source information and group information for the first PIM-SM source.

11 . The border network device of claim 10 , wherein the instructions to receive the PIM-SM register message further comprise instructions to:

periodically receive the PIM-SM register message while the PIM-SM data stream is forwarded to the receiver DR.

12 . The border network device of claim 11 , further comprising instructions to:

periodically resend the first PIM-SM hello message to the second border network device; and

periodically receive the second PIM-SM hello message from the second border network device.

13 . The border network device of claim 12 , further comprising instructions to:

after a timeout period expires without receiving the PIM-SM register message from the source DR, remove an indication of the first PIM-SM source from the first PIM-SM hello message.

14 . The border network device of claim 8 , further comprising instructions to:

sending, to at least one network device at the first fabric, a third PIM-SM hello message indicating that the first border network device is the first RP for the first fabric.

15 . Non-transitory computer-readable media storing programming for execution by one or more processors, the programming comprising instructions to:

send, from a first border virtual tunneling endpoint (VTEP) device in a first fabric included in a virtual extensible local area network (VxLAN), to a second border VTEP device in a second fabric in the VxLAN, a first protocol independent multicast sparse mode (PIM-SM) hello message indicating that the first border VTEP device is a first rendezvous point (RP) for the first fabric;

receive, by the first border VTEP device from the second border VTEP device, a second PIM-SM hello message indicating that the second border VTEP devices is a second RP for the second fabric;

send, from the first border VTEP device to the second border VTEP device, a first PIM-SM control message indicative of PIM-SM sources in the first fabric, including a first PIM-SM source;

receive, by the first border VTEP device from the second border VTEP device, a second PIM-SM control message indicative of PIM-SM sources in the second fabric;

receive, by the first border VTEP device from a receiver designated router (DR) in the first fabric and associated with a first PIM-SM receiver, a PIM-SM join message indicating a PIM-SM group associated with the first PIM-SM source; and

forward, by the first border VTEP device from a source DR associated with the first PIM-SM source, a PIM-SM data stream to the receiver DR.

16 . The non-transitory computer-readable media of claim 15 , further comprising instructions to:

in response to the PIM-SM join message from the receiver DR, create a rendezvous point tree (RPT) between the first border VTEP device and the receiver DR; and

forward the PIM-SM data stream using the RPT.

17 . The non-transitory computer-readable media of claim 15 , further comprising instructions to:

receive, from the source DR, a PIM-SM register message indicating source information and group information for the first PIM-SM source.

18 . The non-transitory computer-readable media of claim 17 , wherein the instructions to receive the PIM-SM register message further comprise instructions to:

periodically receive the PIM-SM register message while the PIM-SM data stream is forwarded to the receiver DR.

19 . The non-transitory computer-readable media of claim 18 , further comprising instructions to:

periodically resend the first PIM-SM hello message to the second border VTEP device; and

periodically receive the second PIM-SM hello message from the second border VTEP device.

20 . The non-transitory computer-readable media of claim 19 , further comprising instructions to:

after a timeout period expires without receiving the PIM-SM register message from the source DR, remove an indication of the first PIM-SM source from the first PIM-SM hello message.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (15)