Systems and methods for determining a topology of an ethernet ring in a building management system

1. A method of determining a topology of devices in an Ethernet ring, comprising:

broadcasting a device discovery command from a ring topology generator to the devices in the Ethernet ring;

receiving device discovery information from one or more of the devices in the Ethernet ring at the ring topology generator;

querying a ring supervisor to confirm that the Ethernet ring is closed and to determine which Ethernet port of the ring supervisor is connected to the Ethernet ring as a forwarding port;

the ring topology generator configured to, for each discovered device in the Ethernet ring:

(i) disabling an Ethernet port of one of the devices in the Ethernet ring;

(ii) verifying that the Ethernet ring is open;

(iii) broadcasting a ring port request onto the Ethernet ring via the ring supervisor;

(iv) receiving a ring port response from each of the devices having received the ring port request;

(v) incrementing a count associated with each device based on receiving a ring port response from the device;

(vi) re-enabling the Ethernet port of the one of the devices in the Ethernet ring; and

(vii) repeating steps (i) through (vi) until each device in the Ethernet ring has had an Ethernet port disabled; and

determining the topology of the devices of the Ethernet ring by ordering the devices in the Ethernet ring based on a value of the count associated with each device, wherein the device having a highest count value being closest to the forwarding port of the ring supervisor, and the device having a lowest count value being furthest from the forwarding port of the ring supervisor.

2. The method of claim 1 , wherein the ring topology generator does not increment a count for a ring port response from the device that currently has the Ethernet port disabled.

3. The method of claim 1 , wherein the Ethernet ring is configured as a Media Redundancy Protocol (MRP) ring.

4. The method of claim 1 , wherein the device discovery information includes a device identification (ID).

5. The method of claim 4 , wherein the device ID is one or more of a media access control (MAC) address, a building automation control network (BACnet) object identification (OID), and a logical device name.

6. The method of claim 1 , further comprising:

broadcasting a ring port query message based on receiving the device discovery information from the one or more devices in the Ethernet ring;

receiving a ring port query response from the one or more devices in the Ethernet ring; and

wherein the ring topology generator is configured to orient the Ethernet ports of the one or more devices in the Ethernet ring based on the received ring port query responses.

7. The method of claim 6 , wherein the ring port query response comprises a message identification (ID), a Device identification (ID), and an Ethernet port on which the ring port query message was received.

8. A system for determining a topology of an Ethernet ring, the system comprising:

a plurality of Ethernet devices configured in the Ethernet ring;

a ring supervisor, the ring supervisor integral to the Ethernet ring and configured to manage data flow within the Ethernet ring; and

a ring topology generator configured to:

broadcast a device discovery command from a ring topology generator to the devices in the Ethernet ring;

receive device discovery information from one or more of the plurality of devices in the Ethernet ring, the received device discovery information indicating a discovered device;

query the ring supervisor to confirm that the Ethernet ring is closed and to determine which Ethernet port of the ring supervisor is connected to the Ethernet ring as a forwarding port;

execute following instructions for each of the discovered devices:

(i) disable an Ethernet port of one of discovered devices in the Ethernet ring;

(ii) verify that the Ethernet ring is open;

(iii) broadcast a ring port request onto the Ethernet ring via the ring supervisor;

(iv) receive a ring port response from each of the discovered devices having received the ring port request;

(v) increment a count associated with each device based on receiving a ring port request from the device;

(vi) re-enable the Ethernet port of the one of the discovered devices; and

(vii) repeat steps (i) through (vi) until each device in the Ethernet ring has had an Ethernet port disabled; and

determine the topology of the devices on the Ethernet ring by ordering the devices in the Ethernet ring based on a value of the count associated with each device, wherein the device having a highest count value is closest to the forwarding port of the ring supervisor, and the device having a lowest count value is the device furthest from the forwarding port of the ring supervisor.

9. The system of claim 8 , wherein the ring topology generator does not increment a count for a ring port response from the device that currently has the Ethernet port disabled.

10. The system of claim 8 , wherein the Ethernet ring is configured as one of a Media Redundancy Protocol (MRP) ring and a Spanning Tree Protocol (STP) ring.

11. The system of claim 8 , wherein the device discovery information comprises a device identification (ID), the device ID comprising one or more of a media access control (MAC) address, a building automation control network (BACnet) object identification (OID), or a logical device name.

12. The system of claim 8 , wherein the ring topology generator is further configured to:

broadcast a ring port query message based on receiving the device discovery information from the one or more devices in the Ethernet ring;

receive a ring port query response from the one or more devices in the Ethernet ring; and

orient the Ethernet ports of the one or more devices in the Ethernet ring based on the received ring port query responses.

13. The system of claim 12 , wherein the ring port query response comprises a message identification (ID), a Device identification (ID), and an Ethernet port on which the ring port query message was received.

14. A method of determining a topology of devices in an Ethernet ring, comprising:

discovering a number and identification of devices within the Ethernet ring;

for each device discovered in the Ethernet ring:

(i) disabling an Ethernet port of one of the devices in the Ethernet ring;

(ii) verifying that the Ethernet ring is open;

(iii) broadcasting a ring port request onto the Ethernet ring from a ring supervisor;

(iv) receiving a ring port response from each of the devices having received the ring port request;

(v) incrementing a count associated with each device based on receiving a ring port response from the device;

(vi) re-enabling the previously disabled Ethernet port of the one of the devices in the Ethernet ring; and

(vii) repeating steps (i) through (vi) until each device in the Ethernet ring has had an Ethernet port disabled; and

determining the topology of the devices in the Ethernet ring by ordering the devices in the Ethernet ring based on a value of the count associated with each device, wherein the device having a highest count value being closest to the forwarding port of the ring supervisor, and the device having a lowest count value being furthest from the forwarding port of the ring supervisor.

15. The method of claim 14 , wherein discovering the number and identity of devices on the Ethernet ring comprises:

broadcasting a device discovery command from a ring topology generator to the devices in the Ethernet ring; and

receiving device discovery information from the devices in the Ethernet ring at the ring topology generator.

16. The method of claim 15 , wherein the device discovery information includes a device identification (ID), the Device identification (ID) comprising one or more of a media access control (MAC) address, a building automation control network (BACnet) object identification (OID), and a logical device name.

17. The method of claim 15 , further comprising:

broadcasting a ring port query message to the Ethernet ring from the ring topology generator based on receiving the device discovery information from the one or more devices in the Ethernet ring;

receiving a ring port query response from the one or more devices in the Ethernet ring; and

wherein the ring topology generator is configured to orient the Ethernet ports of the one or more devices in the Ethernet ring based on the received port query responses.

18. The method of claim 17 , wherein the ring port response comprises a message identification (ID), a Device identification (ID), and an Ethernet port identification on which the ring port query message was received.

19. The method of claim 14 , wherein the count for the ring port response received from the device that currently has the Ethernet port disabled is not incremented while the Ethernet port is disabled.

20. The method of claim 14 , wherein the Ethernet ring is configured as a Media Redundancy Protocol (MRP) ring.