Granted Patent B2

US 12,640,960 · App. 18/643,807 · Granted May 26, 2026

Inventor: Gopinatha Rao P (Bangalore, IN)

Assignee: Hewlett Packard Enterprise Development LP

H04L12/4633H04L12/4641H04L61/103

Abstract

Claims (82)

1 . A computer-implemented method, comprising:

receiving, by a first access network device virtual tunnel end point (VTEP) in a campus network, a network data unit intended for a host;

performing, by the first access network device VTEP, a data plane learn to determine initial address resolution protocol (ARP) information for the host, wherein the initial ARP information includes a first local connection between the host and the first access network device VTEP;

creating an initial first VTEP ARP entry for the host using the initial ARP information;

transmitting, by the first access network device VTEP, the network data unit to the host; and

transmitting, by the first access network device VTEP, a first control plane update including the initial ARP information to a second access network device VTEP in the campus network, the second access network device VTEP having fast roaming enabled,

wherein the second access network device VTEP is configured to create, in response to receiving the first control plane update from the first access network device VTEP, an initial second VTEP ARP entry for the host, the initial second VTEP entry comprising a tunnel connection between the first access network device VTEP and the second access network device VTEP.

2 . The computer-implemented method of claim 1 , further comprising:

receiving, at the first access network device VTEP, a data plane update from the host via the access network device second VTEP indicating a host movement from the first access network device VTEP to the second access network device VTEP; and

updating the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP.

3 . The computer-implemented method of claim 1 , further comprising:

receiving, at the first access network device VTEP, a second control plane update from the host via the second access network device VTEP indicating a host movement from the first access network device VTEP to the second access network device VTEP; and

updating the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP.

4 . The computer-implemented method of claim 1 , further comprising:

receiving, by the second access network device VTEP, a gratuitous ARP (GARP) reply from the host after a host movement from the first access network device VTEP to the second access network device VTEP, wherein the GARP reply is received via a second local connection between the host and the second access network device VTEP; and

updating, by the second access network device VTEP, the initial second VTEP ARP entry for the host to obtain an updated ARP entry for the host comprising the second local connection between the host and the second access network device VTEP.

5 . The computer-implemented method of claim 4 , further comprising:

receiving, by the first access network device VTEP, the GARP reply from the host via the second access network device VTEP over the tunnel connection between the first access network device VTEP and the second access network device VTEP;

updating, by the first access network device VTEP, the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP;

receiving, by the first access network device VTEP and after updating the initial first VTEP entry to obtain the updated first VTEP entry, a control plane update corresponding to the host and comprising a different tunnel connection between the first access network device VTEP and a third access network device VTEP; and

ignoring, by the first access network device VTEP, the control plane update.

6 . The computer-implemented method of claim 4 , further comprising:

receiving, by the first access network device VTEP, the GARP reply from the host via the second access network device VTEP over the tunnel connection between the first access network device VTEP and the second access network device VTEP;

updating, by the first access network device VTEP, the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP;

receiving, by the first access network device VTEP and after updating the initial first VTEP entry to obtain the updated first VTEP entry, a data plane update corresponding to the host and comprising a different tunnel connection between the first access network device VTEP and a third access network device VTEP; and

updating, by the first access network device VTEP, the updated first VTEP ARP entry to obtain a new first VTEP ARP entry comprising the different tunnel connection between the first access network device VTEP and the third access network device VTEP.

7 . The computer-implemented method of claim 1 , wherein the first access network device VTEP and the second access network device VTEP have a common active gateway Internet Protocol (IP) address and active gateway Media Access Control (MAC) address.

8 . A system comprising:

one or more processors; and

one or more non-transitory computer readable media storing instructions which, when executed by the one or more processors, cause the one or more processors to:

receive, by a first access network device virtual tunnel end point (VTEP) a campus network, a network data unit intended for a host;

perform, by the first access network device VTEP, a data plane learn to determine initial address resolution protocol (ARP) information for the host, wherein the initial ARP information includes a first local connection between the host and the first access network device VTEP;

create an initial first VTEP ARP entry for the host using the initial ARP information;

transmit, by the first access network device VTEP, the network data unit to the host; and

transmit, by the first access network device VTEP, a first control plane update including the initial ARP information to a second access network device VTEP in the campus network, the second access network device VTEP having fast roaming enabled,

wherein the second access network device VTEP is configured to create, in response to receiving the first control plane update from the first access network device VTEP, an initial second VTEP ARP entry for the host, the initial second VTEP entry comprising a tunnel connection between the first access network device VTEP and the second access network device VTEP.

9 . The system of claim 8 , wherein execution of the instructions by the one or more processors further cause the one or more processors to:

receive, at the first access network device VTEP, a data plane update from the host via the second access network device VTEP indicating a host movement from the first access network device VTEP to the second access network device VTEP; and

update the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP.

10 . The system of claim 8 , wherein execution of the instructions by the one or more processors further cause the one or more processors to:

receive, at the first access network device VTEP, a second control plane update from the host via the second access network device VTEP indicating a host movement from the first access network device VTEP to the second access network device VTEP; and

update the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP.

11 . The system of claim 8 , wherein execution of the instructions by the one or more processors further cause the one or more processors to:

receive, by the second access network device VTEP, a gratuitous ARP (GARP) reply from the host after a host movement from the first access network device VTEP to the second access network device VTEP, wherein the GARP reply is received via a second local connection between the host and the second access network device VTEP; and

update, by the second access network device VTEP, the initial second VTEP ARP entry for the host to obtain an updated ARP entry for the host comprising the second local connection between the host and the second access network device VTEP.

12 . The system of claim 11 , wherein execution of the instructions by the one or more processors further cause the one or more processors to:

receive, by the first access network device VTEP, the GARP reply from the host via the second access network device VTEP over the tunnel connection between the first access network device VTEP and the second access network device VTEP;

update, by the first access network device VTEP, the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP;

receive, by the first access network device VTEP and after updating the initial first VTEP entry to obtain the updated first VTEP entry, a control plane update corresponding to the host and comprising a different tunnel connection between the first access network device VTEP and a third access network device VTEP; and

ignore, by the first access network device VTEP, the control plane update.

13 . The system of claim 11 , wherein execution of the instructions by the one or more processors further cause the one or more processors to:

receiving, by the first access network device VTEP, the GARP reply from the host via the second access network device VTEP over the tunnel connection between the first access network device VTEP and the second access network device VTEP;

updating, by the first access network device VTEP, the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP;

receiving, by the first access network device VTEP and after updating the initial first VTEP entry to obtain the updated first VTEP entry, a data plane update corresponding to the host and comprising a different tunnel connection between the first access network device VTEP and a third access network device VTEP; and

updating, by the first access network device VTEP, the updated first VTEP ARP entry to obtain a new first VTEP ARP entry comprising the different tunnel connection between the first access network device VTEP and the third access network device VTEP.

14 . The system of claim 8 , wherein the first access network device VTEP and the second access network device VTEP have a common active gateway Internet Protocol (IP) address and active gateway Media Access Control (MAC) address.

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

receive, by a first access network device virtual tunnel end point (VTEP) executing on a network device in a campus network, a network data unit intended for a host;

perform, by the first access network device VTEP, a data plane learn to determine initial address resolution protocol (ARP) information for the host, wherein the initial ARP information includes a first local connection between the host and the first access network device VTEP;

create an initial first VTEP ARP entry for the host using the initial ARP information;

transmit, by the first access network device VTEP, the network data unit to the host; and

transmit, by the first access network device VTEP, a first control plane update including the initial ARP information to a second access network device VTEP in the campus network, the second access network device VTEP having fast roaming enabled,

wherein the second access network device VTEP is configured to create, in response to receiving the first control plane update from the first access network device VTEP, an initial second VTEP ARP entry for the host, the initial second VTEP entry comprising a tunnel connection between the first access network device VTEP and the second access network device VTEP.

16 . The non-transitory computer-readable medium of claim 15 , wherein the programming comprises further instructions to:

receive, at the first access network device VTEP, a data plane update from the host via the second access network device VTEP indicating a host movement from the first access network device VTEP to the second access network device VTEP; and

update the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP.

17 . The non-transitory computer-readable medium of claim 15 , wherein the programming comprises further instructions to:

receive, at the first access network device VTEP, a second control plane update from the host via the second access network device VTEP indicating a host movement from the first access network device VTEP to the second access network device VTEP; and

update the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP.

18 . The non-transitory computer-readable medium of claim 15 , wherein the programming comprises further instructions to:

receive, by the second access network device VTEP, a gratuitous ARP (GARP) reply from the host after a host movement from the first access network device VTEP to the second access network device VTEP, wherein the GARP reply is received via a second local connection between the host and the second access network device VTEP; and

update, by the second access network device VTEP, the initial second VTEP ARP entry for the host to obtain an updated ARP entry for the host comprising the second local connection between the host and the second access network device VTEP.

19 . The non-transitory computer-readable medium of claim 18 , wherein the programming comprises further instructions to:

receive, by the first access network device VTEP, the GARP reply from the host via the second access network device VTEP over the tunnel connection between the first access network device VTEP and the second access network device VTEP;

update, by the first access network device VTEP, the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP;

receive, by the first access network device VTEP and after updating the initial first VTEP entry to obtain the updated first VTEP entry, a control plane update corresponding to the host and comprising a different tunnel connection between the first access network device VTEP and a third access network device VTEP; and

ignore, by the first access network device VTEP, the control plane update.

20 . The non-transitory computer-readable medium of claim 18 , wherein the programming comprises further instructions to:

receive, by the first access network device VTEP, the GARP reply from the host via the second access network device VTEP over the tunnel connection between the first access network device VTEP and the second access network device VTEP;

update, by the first access network device VTEP, the initial first VTEP ARP entry to obtain an updated first VTEP ARP entry for the host comprising the tunnel connection between the first access network device VTEP and the second access network device VTEP;

receive, by the first access network device VTEP and after updating the initial first VTEP entry to obtain the updated first VTEP entry, a data plane update corresponding to the host and comprising a different tunnel connection between the first access network device VTEP and a third access network device VTEP; and

update, by the first access network device VTEP, the updated first VTEP ARP entry to obtain a new first VTEP ARP entry comprising the different tunnel connection between the first access network device VTEP and the third access network device VTEP.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (9)