Fast reroute in a multiprotocol label switching network
First Claim
1. A method for finding an Label Switch Path (LSP) in a Multiprotocol Label Switching (MPLS) network device, comprising:
- receiving a packet from an receive port having an identifier;
searching an improved routing table having an incoming information and an outgoing information for the incoming information having an incoming port identifier that matches the identifier;
retrieving the incoming internal index and the second port identifier from the matching incoming information;
retrieving a status for the second port identifier from a port status table; and
applying a function between the incoming internal index and status forming a derived index.
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Abstract
A fast reroute in a multiprotocol label switching network is provided. According to one embodiment, a method for finding a Label Switch Path (LSP) in a Multiprotocol Label Switching (MPLS) network device is provided. The method comprising retrieving a packet from an receive port having an identifier, searching an improved routing table having an incoming information and an outgoing information for the incoming information having an incoming port identifier that matches the identifier, retrieving the incoming internal index and the outgoing port identifier from the matching incoming information, retrieving a status for the second port identifier from a port status table; and applying an function between the incoming internal index and status forming a derived index.
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Citations
17 Claims
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1. A method for finding an Label Switch Path (LSP) in a Multiprotocol Label Switching (MPLS) network device, comprising:
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receiving a packet from an receive port having an identifier;
searching an improved routing table having an incoming information and an outgoing information for the incoming information having an incoming port identifier that matches the identifier;
retrieving the incoming internal index and the second port identifier from the matching incoming information;
retrieving a status for the second port identifier from a port status table; and
applying a function between the incoming internal index and status forming a derived index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device in a Multiprotocol Label Switching (MPLS) network device having a fast reroute, comprising:
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a first memory unit;
an improved routing table stored in the first memory unit comprising;
an incoming information including a first port identifier, an incoming internal index, and a second port identifier, and an outgoing information including an outgoing internal index, and a third port identifier;
a port status table having a status in the first memory unit;
an incoming port, which has an identifier, receiving a packet;
an incoming mechanism operable to;
search the improved routing table for the incoming information having the incoming port that matches the identifier, retrieve the incoming internal index and the second port identifier for the matching incoming information, and retrieve the status for the second port identifier; and
an function applied between the incoming internal index and status forming a derived index. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification