Incrementally eliminating BGP-LU using SR policies and PCE
AssigneeCiena Corporation
InventorsMuthurajah Sivabalan, Sami Boutros
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Abstract
Systems and methods for incrementally eliminating Border Gateway Protocol—Labeled Unicast (BGP-LU) in a multi-region network include receiving BGP-LU updates from one or more Area Border Router (ABR) nodes in a multi-region network with the ABR nodes between two areas including a first area utilizing Segment Routing without utilizing BGP-LU and a second area utilizing BGP-LU; and, responsive to a request from a first node in the first area to reach a second node in the second area, providing a Segment Identifier (SID) list to the first node where the SID list is determined based on the Segment Routing in the first area and the BGP-LU updates from the second area.
Claims20
A non-transitory computer-readable medium having instructions stored thereon for programming a processing device associated with a Path Computation Element (PCE) to perform steps of:
- receiving Border Gateway Protocol—Labeled Unicast (BGP-LU) updates from one or more Area Border Router (ABR) nodes in a multi-region network with the one or more ABR nodes between two areas including a first area utilizing Segment Routing without utilizing BGP-LU and a second area utilizing BGP-LU;
- and
- responsive to a request from a first node in the first area to reach a second node in the second area, providing a Segment Identifier (SID) list to the first node where the SID list is determined based on the Segment Routing in the first area and the BGP-LU updates from the second area.
A method implemented by a Path Computation Element (PCE) comprising steps of:
- receiving Border Gateway Protocol—Labeled Unicast (BGP-LU) updates from one or more Area Border Router (ABR) nodes in a multi-region network with the one or more ABR nodes between two areas including a first area utilizing Segment Routing without utilizing BGP-LU and a second area utilizing BGP-LU;
- and
- responsive to a request from a first node in the first area to reach a second node in the second area, providing a Segment Identifier (SID) list to the first node where the SID list is determined based on the Segment Routing in the first area and the BGP-LU updates from the second area.
A Path Computation Element (PCE) comprising:
- at least one processor and memory comprising instructions that, when executed, cause the at least one processor to
- receive Border Gateway Protocol—Labeled Unicast (BGP-LU) updates from one or more one or more Area Border Router (ABR) nodes in a multi-region network with the ABR nodes between two areas including a first area utilizing Segment Routing without utilizing BGP-LU and a second area utilizing BGP-LU, and
- responsive to a request from a first node in the first area to reach a second node in the second area, provide a Segment Identifier (SID) list to the first node where the SID list is determined based on the Segment Routing in the first area and the BGP-LU updates from the second area.
Dependencies are inferred from the claim text.