Target fec (forwarding equivalence class) stack based fec query in segment routing environments
AssigneeCisco Technology, Inc.
InventorsNagendra Kumar Nainar, Carlos M. Pignataro, Faisal Iqbal
Life of this patent
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Abstract
In one embodiment, a method includes generating a trace request at an initiator node configured for segment routing, the trace request comprising an FEC (Forwarding Equivalence Class) query corresponding to a label in an FEC stack with an unknown FEC, transmitting the trace request on a path with the unknown FEC, and receiving a response to the trace request, the response comprising FEC information including an identifier associated with a label and a forwarding path and representing a class or category of packets. An apparatus is also disclosed herein.
Claims20
A method comprising:
- generating a trace request at an initiator node configured for segment routing, said trace request comprising an FEC (Forwarding Equivalence Class) query corresponding to a label in an FEC stack with an unknown FEC;
- transmitting said trace request on a path with said unknown FEC;
- and
- receiving a response to said trace request, the response comprising FEC information including an identifier associated with a label and a forwarding path and representing a class or category of packets.
The method of claim 10 wherein said trace request comprises a Target FEC Stack Sub-TLV containing said FEC query and wherein the Target FEC Stack Sub-TLV comprises said FEC query for each label in a label stack with unknown FEC details.
An apparatus comprising:
- an interface for transmitting packets on an LSP (Label Switched Path);
- a processor for generating a trace request at an initiator node configured for segment routing, said trace request comprising an FEC (Forwarding Equivalence Class) query, transmitting said trace request, and processing a response to said trace request, the response comprising FEC information including an identifier associated with a label and a forwarding path and representing a class or category of packets;
- and
- memory for storing the FEC information.
Logic encoded on one or more non-transitory computer readable media for execution and when executed operable to:
- generate a trace request at an initiator node configured for segment routing, said trace request comprising an FEC (Forwarding Equivalence Class) query corresponding to a label in an FEC stack with an unknown FEC;
- transmit said trace request on a path with said unknown FEC;
- and
- process a response to said request, the response comprising FEC information including an identifier associated with a label and a forwarding path and representing a class or category of packets.
Dependencies are inferred from the claim text.