Methods and devices for re-routing MPLS traffic
First Claim
Patent Images
1. A network device, wherein the device:
- detects a failure along an ingress region of a primary path;
re-routes traffic from the primary path associated with an original Internet Protocol (IP) address to an alternate path which includes the device using a forwarding table that includes IP and Multi-Protocol Label Switched (MPLS) routing information while associating the original IP address to the alternate path upon detection of the failure; and
allows traffic to travel along the primary path when the failure is no longer detected along the ingress region.
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Abstract
Multi-Protocol Label Switched (MPLS) traffic is re-routed to an alternate, Label Switched Path (LSP) to bypass a failure along a primary LSP, even though the failure occurs at or along an ingress section of an LSP, while associating an original IP address to the alternate path. Failures are also detected farther downstream outside an ingress section. When this occurs, MPLS traffic is re-routed to an alternate LSP which maintains the same quality of service as an original primary path and includes other network devices which are not a part of the primary path (except for the network device and a destination network device). The techniques require less resources than existing techniques.
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Citations
23 Claims
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1. A network device, wherein the device:
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detects a failure along an ingress region of a primary path; re-routes traffic from the primary path associated with an original Internet Protocol (IP) address to an alternate path which includes the device using a forwarding table that includes IP and Multi-Protocol Label Switched (MPLS) routing information while associating the original IP address to the alternate path upon detection of the failure; and allows traffic to travel along the primary path when the failure is no longer detected along the ingress region. - View Dependent Claims (2, 3)
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4. A network device, wherein the device:
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receives a failure message; re-routes traffic from a primary path associated with an original IP address to an alternate path using a forwarding table that includes IP and MPLS routing information, said rerouting maintaining the original address, the alternate path comprising devices which maintain a same quality of service as the primary path and are not a part of the primary path except for the network device and a destination network device; and allows traffic to travel along the primary path when the failure is no longer detected. - View Dependent Claims (5, 6)
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7. A method for re-routing traffic comprising the steps of:
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detecting a failure along an ingress region of a primary path; re-routing traffic from the primary path associated with an original IP address to an alternate path which includes a source device using a forwarding table that includes IP and MPLS routing information while associating the original address to the alternate path upon detection of the failure; and allowing traffic to travel along the primary path when the failure is no longer detected along the ingress region. - View Dependent Claims (8, 9)
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10. A method for re-routing traffic comprising the steps of:
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receiving a failure message; after said receiving step, re-routing traffic from a primary path associated with an original IP address to an alternate path using a forwarding table that include IP and MPLS routing information, said rerouting maintaining the original address, the alternate path comprising devices which maintain a same quality of service as the primary path and are not a part of the primary path except for an initiating network device and a destination network device; and allowing traffic to travel along the primary path when the failure is no longer detected. - View Dependent Claims (11, 12)
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13. A network device comprising:
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means for detecting a failure along an ingress region of a primary path; means for re-routing traffic from the primary path associated with an original IP address to an alternate path which includes the device using a forwarding table that includes Internet Protocol (IP) and Multi-Protocol Label Switched (MPLS) routing information while associating the original IP address to the alternate path upon detection of the failure; and means for allowing traffic to travel along the primary path when the failure is no longer detected along the ingress region. - View Dependent Claims (14, 15)
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16. A network device comprising:
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means for receiving a failure message; means for re-routing traffic from a primary path associated with an original IP address to an alternate path using a forwarding table that includes IP and MPLS routing information, said means for re-routing maintaining the original address, the alternate path comprising devices which maintain a same quality of service as the primary path and are not a part of the primary path except for the network device and a destination network device; and means for allowing traffic to travel along the primary path when the failure is no longer detected. - View Dependent Claims (17, 18)
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19. A source network device, wherein the device:
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detects a failure along an ingress region of a primary path, where the ingress region comprises a link associated with the source network device; re-routes traffic from the primary path associated with an original Internet Protocol (IP) address to an alternate path which includes the device using a forwarding table that includes IP and Multi-Protocol Label Switched (MPLS) routing information while associating the original IP address to the alternate path upon detection of the failure; and allows traffic to travel along the primary path when the failure is no longer detected along the ingress region. - View Dependent Claims (20, 21)
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22. A source network device, wherein the device:
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detects a failure along an ingress region of a primary path, where the ingress region comprises a link associated with the source network device, and the link comprises either an outgoing link or a link between the source network device and a neighboring network device; re-routes traffic from the primary path associated with an original Internet Protocol (IP) address to an alternate path which includes the device using a forwarding table that includes IP and Multi-Protocol Label Switched (MPLS) routing information while associating the original IP address to the alternate path upon detection of the failure; and allows traffic to travel along the primary path when the failure is no longer detected along the ingress region. - View Dependent Claims (23)
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Specification