CONTINUITY CHECK PROTOCOL OPTIMIZATION SYSTEMS AND METHODS

• US 20160036694A1
• Filed: 08/04/2014
• Published: 02/04/2016
• Est. Priority Date: 08/04/2014
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: ABDUL, Jaffar Hameed, KOMATH, Bindhia, CHANDRAN, Sowmya
• Granted Patent: US 9,485,175 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 41/0654 using network fault recovery ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437
• CPC Class Codes: H04L 41/0663 Performing the actions predefined by failover planning, e.g. switching to standby network elements
• CPC Class Codes: H04L 43/0811 by checking connectivity
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04L 45/28 using route fault recovery
• CPC Class Codes: H04L 45/507 Label distribution
• CPC Class Codes: H04L 45/68 Pseudowire emulation, e.g. IETF WG PWE3

Abstract

A Continuity Check (CC) protocol optimization method in a switch includes operating a plurality of CC sessions with a peer switch, wherein, for CC intervals, N sessions of the plurality CC sessions are set to a short interval and M sessions of the plurality of CC sessions are set to a long interval, wherein N and M are integers; switching a first session of the N sessions with a second session of the M sessions based on one of a fault and user provisioning; and exchanging the CC intervals between the first session and the second session subsequent to the switching.

Claims

1. A Continuity Check (CC) protocol optimization method in a switch, the method comprising:

operating a plurality of CC sessions with a peer switch, wherein, for CC intervals, N sessions of the plurality CC sessions are set to a short interval and M sessions of the plurality of CC sessions are set to a long interval, wherein N and M are integers;

switching a first session of the N sessions with a second session of the M sessions based on one of a fault and user provisioning; and

exchanging the CC intervals between the first session and the second session subsequent to the switching.

2. The CC protocol optimization method of claim 1, wherein the short interval is less than or equal to 10 ms providing 50 ms fault detection and the long interval is 100 ms or greater.

3. The CC protocol optimization method of claim 1, wherein the CC sessions are Bidirectional Forwarding Detection (BFD) sessions.

4. The CC protocol optimization method of claim 1, wherein the CC sessions are Bidirectional Forwarding Detection (BFD) sessions, and wherein the first session and the second session are 1:

1 protected Label Switched Paths (LSPs) with the first session and the second session being, prior to the switching, an active path and a backup path respectively.

5. The CC protocol optimization method of claim 1, wherein the CC sessions are Bidirectional Forwarding Detection (BFD) sessions, wherein the N sessions and the M sessions are in a Label Switched Path (LSP) tunnel group with N<

M.

6. The CC protocol optimization method of claim 1, wherein the CC sessions are Bidirectional Forwarding Detection (BFD) sessions, and wherein the exchanging is performed by changing interval times in BFD control packets.

7. The CC protocol optimization method of claim 1, wherein the exchanging is performed in-service without affecting service on the first session and the second session.

8. The CC protocol optimization method of claim 1, wherein the CC sessions are Connectivity Fault Management (CFM) sessions.

9. The CC protocol optimization method of claim 1, wherein the CC sessions are Pseudowire Virtual Circuit Connectivity Verification (VCCV) sessions.

10. A switch with Continuity Check (CC) protocol optimization, the switch comprising:

one or more ports; and

a controller communicatively coupled to the one or more ports;

wherein the one or more ports and the controller are configured to

operate a plurality of CC sessions with a peer switch, wherein, for CC intervals, N sessions of the plurality CC sessions are set to a short interval and M sessions of the plurality of CC sessions are set to a long interval, wherein N and M are integers,

switch a first session of the N sessions with a second session of the M sessions based on one of a fault and user provisioning, and

exchange the CC intervals between the first session and the second session subsequent to the switching.

11. The switch of claim 11, wherein the short interval is less than or equal to 10 ms providing 50 ms fault detection and the long interval is 100 ms or greater.

12. The switch of claim 11, wherein the CC sessions are Bidirectional Forwarding Detection (BFD) sessions, and wherein the first session and the second session are 1:

1 protected Label Switched Paths (LSPs) with the first session being an active path and the second session being a backup path prior to the switching.

13. The switch of claim 11, wherein the CC sessions are Bidirectional Forwarding Detection (BFD) sessions, wherein the N sessions and the M sessions are in a Label Switched Path (LSP) tunnel group with N<

M.

14. The switch of claim 11, wherein the CC sessions are Bidirectional Forwarding Detection (BFD) sessions, and wherein the exchanging is performed by the switch through changing interval times in BFD control packets.

15. The switch of claim 11, wherein the exchanging is performed in-service without affecting service on the first session and the second session.

16. The switch of claim 11, wherein the CC sessions are Connectivity Fault Management (CFM) sessions.

17. The switch of claim 11, wherein the CC sessions are Pseudowire Virtual Circuit Connectivity Verification (VCCV) sessions.

18. A network with Continuity Check (CC) protocol optimization, the network comprising:

a plurality of interconnected switches;

wherein a first switch and a second switch of the a plurality of interconnected switches are configured to

operate a plurality of CC sessions with one another, wherein, for CC intervals, N sessions of the plurality CC sessions are set to a short interval and M session of the plurality of CC sessions are set to a long interval,

switch a first session of the N sessions with a second session of the M sessions based on one of a fault and user provisioning, and

exchange the CC intervals between the first session and the second session subsequent to the switching.

19. The network of claim 19, wherein the CC sessions are Bidirectional Forwarding Detection (BFD) sessions.

20. The network of claim 19, wherein the CC sessions are one of Pseudowire Virtual Circuit Connectivity Verification (VCCV) sessions and Connectivity Fault Management (CFM) sessions.