Glossary

The following provides definitions for key terms used throughout this document:

Detour formation in the ring topology	The detour formation in the ring topology is a mechanism to reroute the data traffic over the backup path when a failure or congestion occurs in the primary Label Switched Path (LSP).
PLR node	A PLR node is a network device that reacts and takes action when a link fails.
Primary LSP	The primary LSP is the default path of the forwarding data packets from the source device to the destination device.
Protected LSP	A protected LSP is a primary LSP with a backup path in an MPLS network. When there is an issue or a failure in the primary LSP, the traffic is rerouted through the backup path, protecting the primary LSP.
RSVP Tunnel	RSVP tunnels are logical paths through which data traffic traverses in an IP network.
Upstream path of the protected LSP	The upstream path of the protected LSP is the section of the network that precedes the PLR node in the network.