The Generalized TTL Security Mechanism (GTSM) for the Label Distribution Protocol (LDP)

This RFC 6720 was published in 2012.

Abstract

The Generalized TTL Security Mechanism (GTSM) describes a generalized use of a packet's Time to Live (TTL) (IPv4) or Hop Limit (IPv6) to verify that the packet was sourced by a node on a connected link, thereby protecting the router's IP control plane from CPU utilization-based attacks.
This technique improves security and is used by many protocols.
This document defines the GTSM use for the Label Distribution Protocol (LDP).

RFC 6720 introduction

LDP [RFC5036] specifies two peer discovery mechanisms, a Basic one and an Extended one, both using UDP transport.
The Basic Discovery mechanism is used to discover LDP peers that are directly connected at the link level, whereas the Extended Discovery mechanism is used to locate Label Switching Router (LSR) neighbors that are not directly connected at the link level.
Once discovered, the LSR neighbors can establish the LDP peering session, using the TCP transport connection.

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