Wiring closet redundancy

• US 8,259,562 B2
• Filed: 03/07/2005
• Issued: 09/04/2012
• Est. Priority Date: 10/07/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Smith, Michael, Karam, Roger, Wang, Jeffrey
• Primary Examiner(s): Lai, Andrew
• Application Number:
  US11/074,923
• Publication Number:
  US 20060077891A1
• Time in Patent Office: 2,738 Days
• Field of Search: 370/225, 370/242, 370/355, 370/446, 370/465, 370/466, 455/402, 714/43, 714/4, 714/223, 709/223, 709238-242
• US Class Current: 370/225
• CPC Class Codes: H04J 3/14 Monitoring arrangements for SDH/SONET rings H04J3/085
• CPC Class Codes: H04L 1/22 using redundant apparatus to increase reliability
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04L 41/0663 Performing the actions predefined by failover planning, e.g. switching to standby network elements
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/0811 by checking connectivity

Abstract

Systems and method for providing redundancy of communications and/or inline power to a powered Ethernet device are disclosed. A redundancy device is configured to receive in-line data and/or power from a plurality of Ethernet relay uplinks and to monitor communications between the relay uplinks. One of the relay uplinks is established as an active state uplink and passes data and/or power to the power device. Responsive to a switchover communication from a redundant uplink, the redundancy device establishes the redundant uplink as the active uplink, thereby passing data and/or power from the redundant uplink to the power device. The relay uplinks may use packet-based communication to sense when there is a failure in a link, and replace a failed device with a redundant device.

Claims

1. An apparatus, comprising:

a first Power Over Ethernet circuit configured to provide data and power to a protected Ethernet device over a downstream connection from an active Ethernet relay uplink device;

a second Power Over Ethernet circuit configured to receive in-line data and power from a plurality of Ethernet relay uplink devices, and to monitor communications between the plurality of Ethernet relay uplink devices, where the active Ethernet relay uplink device is a first member of the plurality of Ethernet relay uplink devices; and

a switchover logic configured to establish a second member of the plurality of Ethernet relay uplink devices as the active Ethernet relay uplink device by;

controlling the second Power Over Ethernet circuit to pass data and power from the second member of the plurality of Ethernet relay uplink devices to the first Power Over Ethernet circuit, in response to receiving, from the second member of the plurality of Ethernet relay uplink devices, a switchover command sent independently of the protected Ethernet device.

2. The apparatus of claim 1, where the communications between the plurality of Ethernet relay uplink devices are effected using packet-based communication over an Ethernet link.

3. The apparatus of claim 2, where the plurality of Ethernet relay uplink devices are configured to test the integrity of the connection between the apparatus and the active uplink device, and to issue the switchover command responsive to a determination that the active Ethernet relay uplink device has failed.

4. The apparatus of claim 3, where the communications between the plurality of Ethernet relay uplink devices are performed responsive to an indication inserted in the packet in place of the destination media access control (MAC) address of the packet.

5. The apparatus of claim 3, where the apparatus receives in-line power from the plurality of relay uplink devices.

6. The apparatus of claim 1, where the plurality of Ethernet relay uplink devices are configured to test the integrity of their connection to the apparatus.

7. The apparatus of claim 1, wherein the second member of the plurality of Ethernet relay uplink devices is configured to issue the switchover command responsive to determining that the active Ethernet relay uplink device has failed, wherein determining that the active Ethernet relay uplink device has failed comprises:

verifying that a link between the second member and the apparatus is operational, via receipt of one or more loopback packets echoed by the apparatus via the link; and

verifying that at least one of (i) the active Ethernet relay uplink device and (ii) a link between the active Ethernet relay uplink device and the apparatus is not operational, via non-receipt of a predetermined number connectivity check packets from the active Ethernet relay uplink device within a predetermined time period.

8. A redundancy device for providing redundancy for communications and inline power to a protected Ethernet device in a wired data telecommunications network, comprising:

a first data switch configured to receive data and power from a first and second upstream Ethernet source over respective differential signal pairs;

a power source for supplying inline power to the differential signal pairs;

the first data switch including control circuitry for selectively routing power and data from one of the first and second upstream sources to a downstream Ethernet powered device, in response to receiving, from the one of the first and second upstream sources, a switchover command sent independently of the protected Ethernet device.

9. The redundancy device of claim 8, where the device is configured to perform an operation responsive to an indication in a destination MAC address of a received packet.

10. The redundancy device of claim 9, where the switching and control circuitry are configured to perform a lookup operation and execute a fetched operation corresponding with a decoded address in a table.

11. The redundancy device of claim 10, where the switching and control circuitry are configured to switch data and traffic flow between the upstream sources and the Ethernet powered device responsive to the indication contained in the received packet.

12. The redundancy device of claim 11, comprising a second data switch operatively coupled to the first data switch through relay control circuitry, the relay control circuitry being configured to pass power and data through the second data switch in the event of a failure of the first data switch.

13. The redundancy device of claim 11, where the first data switch is placed in a state of high impedance in the event of a failure.

14. A redundancy device for providing redundancy for communications and inline power to a protected Ethernet device in a wired Power Over Ethernet (PoE) network comprising:

first data switching means for receiving data and power from a first and second upstream Ethernet source over respective differential signal pairs;

power source means for supplying inline power to the differential pairs;

the first data switching means including switching and control means for routing power and data from a selected one of the first and second upstream sources to a downstream Ethernet powered device, in response to receiving, from the one of the first and second upstream sources, a switchover command sent independently of the protected Ethernet device.

15. The redundancy device of claim 14, where the switching and control means are configured to switch data and traffic flow between the upstream sources and the Ethernet powered device responsive to an indication contained in a received packet.

16. The redundancy device of claim 15, comprising second data switching operatively coupled to the first data switching means, the device comprising relay control circuitry means for passing power and data through the second data switching means in the event of a failure of the first data switching means.

17. The redundancy device of claim 16, where the first data switching means is placed in a state of high impedance in the event of a failure.

18. A device, comprising:

a plurality of relay uplink ports configured to provide data and inline power to the device;

where a member of the plurality of relay uplink ports provides inline power and data from an active source to the device;

where the device is configured to selectively provide power and data over a downstream port to a protected device, and

where the device is configured to switch to providing, over the downstream port to the protected device, power and data from an inactive source and via a member of the plurality of relay uplink ports that sent a switchover command independently of the device, in response to receiving the switchover command in communications on the plurality of relay uplink ports.

19. The device of claim 18, where the plurality of relay uplink ports are configured to issue a switchover communication to the device responsive to a determination that the active source has failed.

20. The device of claim 19, where the switchover communication includes replacing a destination MAC address of a packet with a switchover command for the device.