Granted Patent B2

US 9,258,221 · App. 13/907,122 · Granted Feb 9, 2016

Abstract

Claims (42)

1. A method performed by a network node in a resource reservation protocol (RSVP) based label switch path (LSP) network, the method comprising:

receiving a message to establish a LSP specifying a refresh interval for the LSP;

receiving a resv message for the LSP;

initiating the establishment of a backup path for the LSP;

setting a backup timer based on a backup timer value that is determined based on locally preconfigured data at the network node that is independent of the refresh interval specified by the message; and

reinitiating the establishment of a backup path for the LSP upon the expiration of the backup timer.

2. The method of claim 1 , wherein the message to establish a LSP is a path message.

3. The method of claim 2 , further comprising refreshing the LSP after a set interval by receiving another path message.

4. The method of claim 1 , wherein the backup timer value is determined using backup timer value rules locally predefined at the network node.

5. The method of claim 1 , further comprising determining the next node along the LSP.

6. The method of claim 1 , further comprising:

receiving a message to tear down the LSP; and

tearing down the LSP in the network node.

7. The method of claim 1 , wherein the message to establish a LSP is a request to establish a LSP and wherein the network node is an ingress network node.

8. A network node in a resource reservation protocol (RSVP) based label switch path (LSP) network, the network node comprising:

an input/output (I/O) interface configured to receive a path message and a resv message;

a data storage configured to store data for determining a backup timer value; and

a processor configured to:

receive a message to establish a LSP specifying a refresh interval for the LSP;

receive a resv message for the LSP;

initiate the establishment of a backup path for the LSP;

set a backup timer using the backup timer value, wherein the data for determining the backup timer value is independent of the refresh interval specified by the message; and

reinitiate the establishment of a backup path for the LSP upon the expiration of the backup timer.

9. The network node of claim 8 , wherein the message to establish a LSP is a path message.

10. The network node of claim 9 , wherein the processor is further configured to refresh the LSP after a set interval by receiving another path message.

11. The network node of claim 8 , wherein the data comprises backup timer value rules locally defined at the network node.

12. The network node of claim 8 , wherein the processor is further configured to determine the next node along the LSP.

13. The network node of claim 8 , wherein the message to establish a LSP is a request to establish a LSP and wherein the network node is an ingress network node.

14. The network node of claim 8 , wherein the processor is further configured to:

receive a message to tear down the LSP; and

tear down the LSP in the network node.

15. A non-transitory computer-readable storage medium encoded with instructions executable by a processor in a network node in a resource reservation protocol (RSVP) based label switch path (LSP) network, the non-transitory computer readable storage medium comprising:

instructions for receiving a message to establish a LSP specifying a refresh interval for the LSP;

instructions for receiving a resv message for the LSP;

instructions for initiating the establishment of a backup path for the LSP;

instructions for setting a backup timer based on a backup timer value that is determined based on locally preconfigured data at the network node that is independent of the refresh interval specified by the message; and

instructions for reinitiating the establishment of a backup path for the LSP upon the expiration of the backup timer.

16. The non-transitory computer-readable storage medium of claim 15 , wherein the message to establish a LSP is a path message.

17. The non-transitory computer-readable storage medium claim 15 , wherein the message to establish a LSP is a request to establish a LSP and wherein the network node is an ingress network node.

18. The method of claim 1 , wherein the locally preconfigured data is a value for use as the backup timer value.

19. The network node of claim 8 , wherein the data for determining the backup timer value comprises a value for use as the backup timer value.

20. The non-transitory computer-readable storage medium claim 15 , wherein the locally preconfigured data is a value for use as the backup timer value.

Assignments (13)