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Table of Contents
RSVP-TE(Resource Reservation Protocol-Traffic Engineering) is the enhanced RSVP for MPLS. RSVP-TE is not a real routing protocol, but it works with routing protocols.
For RSVP-TE, bidirectional flow is required. To provide this, there must be two RSVP sessions. Because RSVP-TE is unidirectional.
RSVP-TE brings some benefits to MPLS. These benefits are:
– Ability to define LSP paths, path choice by administrator.
– Advanced cost calculation, not restricted to IGP cost values.
– Rich set of traffic protection (secondary paths and fast reroute).
– Ability to make resource reservation functionality.
As we talked about before in LDP articles, there are also some main characteristics for RSVP-TE. Some of these characteristics are different than LDP. What are these characteristics? Let’s check:
– Downstream on demand : LSPs signalled when requested. ( This was unsolicited downstream in LDP, which send labels without any requests).
– Ordered control : Label distribution process follows a hierarchical order (Same as LDP).
– Conservative label retention : Labels are cleared if not needed. ( This was liberal label retention in LDP, which stores all the labels).
Gokhan Kosem is a Network Engineer, Instructor and the Founder of IPCisco.com with 15+ years of experience in Cisco, Nokia, Huawei, Juniper, Linux, Service Provider Networks, Routing and Switching technologies.
He has worked on the backbone networks of major service providers and network vendors including Nortel, Alcatel-Lucent (Nokia) and has extensive hands-on experience with Cisco, Huawei, Juniper and Nokia networking technologies.
He has trained thousands of networking students worldwide through IPCisco.com, Udemy, books, labs, quizzes, and educational content across multiple social media platforms.
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