Hardware based packet replication at tail end node

Patent metadata

Field	Value
Publication number	US-11218336-B2
Application number	US-202016842422-A
Country	US
Kind code	B2
Filing date	Apr 7, 2020
Priority date	Sep 25, 2017
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

Aspects of the disclosed technology address limitations relating to packet replication for multi-destination traffic, by providing methods for performing hardware-based replication in network infrastructure devices, such as switches. In some aspects, application specific integrated circuits (ASICs) resident in physical devices can be used to perform packet replication. Depending on implementation, a hardware-based replication process can include steps for receiving a first packet that includes a first outer header containing first address information, receiving a second packet including a second outer header containing a hardware replication flag, forwarding the first packet to all virtual tunnel endpoints (VTEPs) connected with the TOR switch, and performing hardware replication for the second packet based on the hardware replication flag to generate one or more unicast packets. Systems and machine readable media are also provided.

First claim

What is claimed is:

1. A computer-implemented method for improving traffic flow performance at a switch in a virtual network environment, the method comprising:
receiving a multicast packet at the switch;
receiving a unicast packet at the switch, the unicast packet containing a hardware replication flag;
determining whether to replicate the multicast packet at the switch based on both the multicast packet being destined to a multicast address and the multicast packet failing to include a multicast packet hardware replication flag;
forwarding, by the switch, the multicast packet to virtual tunnel endpoints connected with the switch while refraining from replicating the multicast packet at the switch based on both the multicast packet being destined to the multicast address and the multicast packet failing to include the multicast packet hardware replication flag;
performing hardware replication at the switch for the unicast packet based on the hardware replication flag to generate one or more unicast packets; and
forwarding, from the switch, the one or more unicast packets to one or more recipient switches in a network.

2. The method of claim 1 , wherein the switch is a top of rack switch.

3. The method of claim 1 , wherein performing hardware replication further comprises:
generating one unicast packet for each recipient switch in the network.

4. The method of claim 1 , wherein hardware replication is performed using one or more Application Specific Integrated Circuits.

5. The method of claim 1 , wherein the unicast packet includes packet replication information configured to cause a respective receiving switch to perform a unicast to multicast group translation.

6. The method of claim 5 , wherein the unicast to multicast group translation produces a translated packet, and the method further comprises:
delivering the translated packet using a Layer 2 multicast address.

7. The method of claim 1 , wherein the unicast packet includes unicast address information, and the multicast packet includes multicast address information.

8. A switch comprising:
a non-transitory computer-readable medium storing instructions;
a processor programmed to cooperate with the instructions to cause the switch to perform operations comprising:
receiving a multicast packet at the switch;
receiving a unicast packet at the switch, the unicast packet containing a hardware replication flag;
determining whether to replicate the multicast packet at the switch based on both the multicast packet being destined to a multicast address and the multicast packet failing to include a multicast packet hardware replication flag;
forwarding, by the switch, the multicast packet to virtual tunnel endpoints connected with the switch while refraining from replicating the multicast packet at the switch based on both the multicast packet being destined to the multicast address and the multicast packet failing to include the multicast packet hardware replication flag;
performing hardware replication at the switch for the unicast packet based on the hardware replication flag to generate one or more unicast packets; and
forwarding, from the switch, the one or more unicast packets to one or more recipient switches in a network.

9. The switch of claim 8 , wherein the switch is a top of rack switch.

10. The switch of claim 8 , wherein performing hardware replication further comprises:
generating one unicast packet for each recipient switch in the network.

11. The switch of claim 8 , wherein hardware replication is performed using one or more Application Specific Integrated Circuits.

12. The switch of claim 8 , wherein the unicast packet includes packet replication information configured to cause a respective receiving switch to perform a unicast to multicast group translation.

13. The switch of claim 12 , wherein the unicast to multicast group translation produces a translated packet, and the operations further comprise:
delivering the translated packet using a Layer 2 multicast address.

14. The switch of claim 8 , wherein the unicast packet includes unicast address information, and the multicast packet includes multicast address information.

15. A non-transitory computer-readable storage media comprising instructions stored therein, which when executed by a processor cause the processors to perform operations comprising:
receiving a multicast packet at a switch;
receiving a unicast packet at the switch, the unicast packet containing a hardware replication flag;
determining whether to replicate the multicast packet at the switch based on both the multicast packet being destined to a multicast address and the multicast packet failing to include a multicast packet hardware replication flag;
forwarding, by the switch, the multicast packet to virtual tunnel endpoints connected with the switch while refraining from replicating the multicast packet at the switch based on both the multicast packet being destined to the multicast address and the multicast packet failing to include the multicast packet hardware replication flag;
performing hardware replication at the switch for the unicast packet based on the hardware replication flag to generate one or more unicast packets; and
forwarding, from the switch, the one or more unicast packets to one or more recipient switches in an network.

16. The non-transitory computer-readable storage media of claim 15 , wherein the switch is a top of rack switch.

17. The non-transitory computer-readable storage media of claim 15 , wherein performing hardware replication further comprises:
generating one unicast packet for each recipient switch in the underlay network.

18. The non-transitory computer-readable storage media of claim 15 , wherein hardware replication is performed using one or more Application Specific Integrated Circuits.

19. The non-transitory computer-readable storage media of claim 15 , wherein the unicast packet includes packet replication information configured to cause a respective receiving switch to perform a unicast to multicast group translation.

20. The non-transitory computer-readable storage media of claim 19 , wherein the unicast to multicast group translation produces a translated packet, and the operations further comprise:
delivering the translated packet using a Layer 2 multicast address.

Assignees

• Cisco Tech Inc

Inventors

• Narayanan Swami
• Mehta Ambrish
• Srinivasan Venkatesh
• Sivaramu Raghava
• Banerjee Ayan

Classifications

• H04L12/185

  with management of multicast group membership · CPC title

• H04L12/1886

  with traffic restrictions for efficiency improvement, e.g. involving subnets or subdomains · CPC title

• H04L12/4633 Primary

  Interconnection of networks using encapsulation techniques, e.g. tunneling · CPC title

• H04L63/029

  Firewall traversal, e.g. tunnelling or, creating pinholes · CPC title

• H04L69/02

  Protocol performance · CPC title