RSVP-TE Pop&Go: Using a shared MPLS forwarding plane

RSVP-TE is widely deployed in backbone networks and is used for its rich feature benefits (such as admission control, auto-bandwidth, Fast Reroute, Container LSPs) …

RSVP-TE is widely deployed in backbone networks and is used for its rich feature benefits (such as admission control, auto-bandwidth, Fast Reroute, Container LSPs). Coupling these feature benefits of the RSVP-TE control plane with the simplicity of the Segment Routing MPLS forwarding plane allows significant reduction in forwarding plane state by sharing transit labels across LSPs. This session will describe draft-sitaraman-mpls-rsvp-shared-labels introducing the notion of pre-installed ‘per Traffic Engineering (TE) link labels’ that can be shared by MPLS RSVP-TE LSPs that traverse these TE links. These labels reduce the overall data plane churn during LSP setup and teardown and provide further decoupling from the forwarding plane. Forwarding from the ingress is achieved using label stacking in RSVP-TE. Pop&Go tunnels offer a self-contained solution to automatically delegate label stack imposition to transit hops to manage any label stack push depth limitations at the ingress. The solution works with distributed path setup as well as with a centralized controller to traffic engineer paths in the network. Co-Authors: Harish Sitaraman, Juniper Networks, Mazen Khaddam, Cox Communications , Vishnu Pavan Beeram, Juniper Networks.