In-band control of network elements

• US 9,571,199 B1
• Filed: 09/12/2014
• Issued: 02/14/2017
• Est. Priority Date: 05/12/2014
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: Azarakhsh, Nozar, Bannon, Roy Michael
• Primary Examiner(s): Jacob, Oommen
• Application Number:
  US14/484,983
• Time in Patent Office: 886 Days
• Field of Search: 398/135, 398/28, 398/45
• US Class Current: 1/1
• CPC Class Codes: H04B 10/40 Transceivers
• CPC Class Codes: H04Q 11/0066 Provisions for optical burst or packet networks
• CPC Class Codes: H04Q 2011/0073 Provisions for forwarding or routing, e.g. lookup tables
• CPC Class Codes: H04Q 2011/0081 Fault tolerance; Redundancy; Recovery; Reconfigurability
• CPC Class Codes: H04Q 2011/0086 Network resource allocation, dimensioning or optimisation

Abstract

A network element that allows in-band control of the network element includes a plurality of interfaces for connecting to other network elements. The network element includes a high data rate transceiver logic configured for transmitting and receiving communications having a first data rate over a first communication channel. The network element also includes a low data rate transceiver logic configured for transmitting and receiving communications having a second data rate that is substantially lower than the first data rate over a second communication channel. The network element further includes a shared photodiode for receiving optical signals over the first and second communication channels. The shared photodiode also converts received optical signals into electrical signals for processing by one of the high data rate transceiver logic and the low data rate transceiver logic. A shared laser module configured to be driven by the high data rate transceiver logic and the low data rate transceiver logic is also included in the network element to output an optical signal over a fiber optic cable via one of the first and second communication channels.

Claims

1. A network element comprising:

a high data rate transceiver logic configured for transmitting and receiving communications having a first data rate over a first communication channel;

a low data rate transceiver logic configured for transmitting and receiving communications having a second data rate that is substantially lower than the first data rate over a second communication channel;

a shared photodiode for receiving optical signals over the first and second communication channels and converting received optical signals into electrical signals for processing by one of the high data rate transceiver logic and the low data rate transceiver logic;

a shared laser module configured to be driven by the high data rate transceiver logic and the low data rate transceiver logic to output an optical signal over a fiber optic cable via one of the first and second communication channels; and

logic configured to detect that the first communication channel is non-operational, and in response, monitor signals received at the shared photodiode via the second communications channel for configuration data for facilitating a handshaking process on the first communication channel.

2. The network element of claim 1, wherein the high data rate transceiver logic and low data rate transceiver comprises distinct integrated circuit devices.

3. The network element of claim 1, wherein the high data rate transceiver logic and low data rate transceiver logic comprise separate logic with a monolithic transceiver application-specific integrated circuit (“

ASIC”

).

4. The network element of claim 1, comprising control logic configured to process control plane communications received via the second communication channel addressed to the network element.

5. The network element of claim 1, comprising switching logic configured to process data plane communications addressed to devices other than the network element.

6. The network element of claim 1, comprising frequency determination and filter logic configured to determine if a communication received at the shared photodiode has a high data rate or a low data rate.

19. The network element of claim 4, wherein control plane communications comprise data containing instructions to perform one or more of installing software, resetting the network element, or updating a forwarding table.

7. A method comprising:

transmitting and receiving communications, by a network device, at a first data rate over a first communication channel using a high data rate transceiver logic;

transmitting and receiving communications, by the network device, at a second data rate over a second communication channel using a low data rate transceiver logic, wherein the second data rate is substantially lower than the first data rate;

receiving optical signals via a shared photodiode shared by the first and second communication channels;

converting the received optical signals into electrical signals for processing by one of the high data rate transceiver logic and the low data rate transceiver logic;

driving a shared laser module, by the high data rate transceiver logic and the low data rate transceiver logic, to transmit an output optical signal over a fiber optic cable via one of the first and second communication channels; and

detecting that the first communication channel is non-operational, and in response, monitor signals received at the shared photodiode via the second communications channel for configuration data for facilitating a handshaking process on the first communication channel.

8. The method of claim 7, further comprising processing, by the network device, control plane communications received via the first communication channel addressed to the network device.

9. The method of claim 7, the network device comprising switching logic, the method further comprising the switching logic processing data plane communications addressed to devices other than the network device.

10. The method of claim 7, further comprising determining if the received signal is a high data rate signal or a low data rate signal.

20. The method of claim 8, wherein control plane communications comprise data containing instructions to perform one or more of installing software, resetting the network element, or updating a forwarding table.

11. A network element comprising:

a high data rate transceiver logic configured for transmitting and receiving communications having a first data rate over a first communication channel;

a low data rate transceiver logic configured for transmitting and receiving communications having a second data rate that is substantially lower than the first data rate over a second communication channel;

a shared photodiode for receiving optical signals over the first and second communication channels and converting received optical signals into electrical signals for processing by one of the high data rate transceiver logic and the low data rate transceiver logic;

a shared laser module configured to be driven by the high data rate transceiver logic and the low data rate transceiver logic to output an optical signal over a fiber optic cable via one of the first and second communication channels; and

logic configured to detect that the first communication channel is non-operational and transmit, via the shared laser module in response to detecting that the first communication channel is non-operational, data containing a reset instruction over the second communication channel.

12. The network element of claim 11, wherein the high data rate transceiver logic and low data rate transceiver comprises distinct integrated circuit devices.

13. The network element of claim 11, wherein the high data rate transceiver logic and low data rate transceiver logic comprise separate logic with a monolithic transceiver application-specific integrated circuit (“

ASIC”

).

14. The network element of claim 11, comprising control logic configured to process control plane communications received via the second communication channel addressed to the network element.

15. The network element of claim 14, wherein control plane communications comprise data containing instructions to perform one or more of installing software, resetting the network element, or updating a forwarding table.

16. The network element of claim 11, comprising switching logic configured to process data plane communications addressed to devices other than the network element.

17. The network element of claim 11, comprising frequency determination and filter logic configured to determine if a communication received at the shared photodiode has a high data rate or a low data rate.

18. The network element of claim 11, wherein:

the logic is configured to monitor, in response to detecting that the first communication channel is non-operational, signals received at the shared photodiode via the second communications channel for configuration data for facilitating a handshaking process on the first communication channel.