IP-based forwarding of bridged and routed IP packets and unicast ARP

Patent metadata

Field	Value
Publication number	US-12244496-B2
Application number	US-202117187332-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Nov 5, 2013
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

Disclosed herein are methods of forwarding data over an IP network. The methods may include receiving a packet from a source host connected to the IP network, identifying the IP address of a destination host designated in the packet, determining the location on the IP network where the destination host designated by the packet is connected, without reference to the MAC address specified in the packet, by using location-identification information stored on the IP network, and forwarding the packet to the location on the IP network where the destination host is connected without reference to the MAC address specified in the packet. Also disclosed herein are related network devices implementing such techniques and operations, as well as IP networks which include such network devices.

First claim

The invention claimed is:

1. A method comprising:
receiving, by a first network device from a source host connected to a network, a packet;
identifying, from the packet, an internet protocol (IP) address of a destination host;
determining a location of a second network device connected to the destination host regardless of whether the second network device is located on a same subnet, at least in part by matching one or more IP addresses with one or more locations on the network based on location information stored on the network without reference to a media access control (MAC) address specified in the packet; and
in response to and based on identifying the second network device from the location information, forwarding the packet to the second network device connected to the destination host without reference to the MAC address specified in the packet.

2. The method of claim 1 , wherein the location information comprises a list matching the one or more IP addresses with the one or more locations on the network.

3. The method of claim 2 , wherein:
the location information is associated with the first network device; and
the location of the second network device is determined from the location information before the packet is forwarded from the first network device.

4. The method of claim 2 , wherein:
the location information is associated with the second network device; and
the location of the second network device is determined from the location information after the packet is forwarded from the first network device.

5. The method of claim 2 , wherein the location information is stored at a database distributed across one or more network devices in the network.

6. The method of claim 1 , wherein the packet is encapsulated.

7. The method of claim 1 , wherein the first network device is a virtual switch device which operates within a virtualization layer, and wherein the source host issuing the packet operates as a virtual machine within the virtualization layer.

8. The method of claim 1 , wherein the first network device is a leaf network device in a leaf/spine network fabric.

9. The method of claim 1 , wherein the packet is an address resolution protocol packet.

10. A network device comprising:
at least one processor; and
at least one memory, storing instructions which when executed by the at least one processor, causes the at least one processor to:
receive, from a source host connected to a network, a packet;
identify, from the packet, an internet protocol (IP) address of a destination host;
determine a location of a second network device connected to the destination host regardless of whether the second network device is located on a same subnet, at least in part by matching one or more IP addresses with one or more locations on the network based on location information stored on the network without reference to a media access control (MAC) address specified in the packet; and

in response to and based on identifying the second network device from the location information, forward the packet to the second network device connected to the destination host without reference to the MAC address specified in the packet.

11. The network device of claim 10 , wherein the location information comprises a list matching the one or more IP addresses with the one or more locations on the network.

12. The network device of claim 11 , wherein:
the location information is associated with the network device; and
the location of the second network device is determined from the location information before the packet is forwarded from the network device.

13. The network device of claim 11 , wherein:
the location information is associated with the second network device; and
the location of the second network device is determined from the location information after the packet is forwarded from the network device.

14. The network device of claim 11 , wherein the location information is stored at a database distributed across one or more network devices in the network.

15. The network device of claim 10 , wherein the packet is encapsulated.

16. The network device of claim 10 , wherein the network device is a virtual switch device which operates within a virtualization layer, and wherein the source host issuing the packet operates as a virtual machine within the virtualization layer.

17. The network device of claim 10 , wherein the network device is a leaf network device in a leaf/spine network fabric.

18. The network device of claim 10 , wherein the packet is an address resolution protocol packet.

19. At least one non-transitory computer-readable medium, storing instructions which when executed by at least one processor, causes the at least one processor to:
receive, from a source host connected to a network, a packet;
identify, from the packet, an internet protocol (IP) address of a destination host;
determine a location of a second network device connected to the destination host regardless of whether the second network device is located on a same subnet, at least in part by matching one or more IP addresses with one or more locations on the network based on location information stored on the network without reference to a media access control (MAC) address specified in the packet; and
in response to and based on identifying the second network device from the location information, forward the packet to the second network device connected to the destination host without reference to the MAC address specified in the packet.

20. The at least one non-transitory computer-readable medium of claim 19 , wherein the location information comprises a list matching one or more IP addresses with one or more locations on the network.

Assignees

• Cisco Tech Inc

Inventors

• Merchant Sameer
• Edsall Thomas James
• Yadav Navindra

Classifications

• H04L61/103

  across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP] · CPC title

• H04L45/74 Primary

  Address processing for routing · CPC title