Table of Contents



RSVP-TE (Resource Reservation Protocol-Traffic Engineering) and SR-TE (Segment Routing Traffic Engineering) are two different approaches to traffic engineering in IP networks.

RSVP-TE is a protocol that enables the reservation of network resources, such as bandwidth, for specific traffic flows. It works by establishing a path between the source and destination nodes of a flow, and then reserving resources along that path. RSVP-TE is widely used in traditional MPLS networks, where the control plane is separate from the forwarding plane.

SR-TE, on the other hand, is a newer approach to traffic engineering that uses a different paradigm called "source routing." In SR-TE, the source node of a traffic flow specifies the path that the flow should take through the network. The network nodes along the path simply forward the traffic based on the instructions provided by the source node. This approach simplifies the control plane, as the path selection and resource reservation are handled by the source node rather than the network.

Both RSVP-TE and SR-TE have their own strengths and weaknesses, and the choice between them depends on the specific needs of the network and the applications running on it.

RSVP-TE and SR-TE are two different technologies used in Multiprotocol Label Switching (MPLS) networks to establish label-switched paths (LSPs).

RSVP-TE (Resource Reservation Protocol-Traffic Engineering) is a signaling protocol used to establish LSPs in MPLS networks. RSVP-TE works by setting up a signaling path between the ingress and egress routers, which reserves network resources along the path. This allows for traffic engineering, which involves controlling the flow of traffic to optimize network performance and efficiency.

Segment Routing Traffic Engineering (SR-TE), on the other hand, is a newer technology that allows for traffic engineering in MPLS networks using a simplified approach. Instead of using signaling protocols like RSVP-TE to establish LSPs, SR-TE uses a routing protocol to define the path that a packet should take through the network. This path is determined by the use of a segment list, which is a list of labels that define the path that the packet should take through the network.

In general, SR-TE is considered to be a more scalable and flexible solution for traffic engineering in MPLS networks, as it simplifies the process of establishing LSPs and reduces the amount of signaling required. However, RSVP-TE is still widely used and may be preferred in certain situations where more fine-grained control is required over the traffic engineering process.

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Orhan Ergun

Orhan Ergun, CCIE/CCDE Trainer, Author of Many Networking Books, Network Design Advisor, and Cisco Champion 2019/2020/2021

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