6. Security Considerations

This document does not make a large change to the operation of the MPLS data plane, and security considerations are largely unchanged from those specified in the MPLS Architecture [RFC3031] and in the MPLS and GMPLS Security Framework [RFC5920].

However, it should be noted that increasing the label stack can cause packet fragmentation and may also make packets unprocessable by some implementations. This document provides a protocol-legal way to increase the label stack through the insertion of additional {XL,ESPL} pairs at a greater rate than insertion of single "rogue" labels. This might provide a way to attack some nodes in a network that can only process label stacks of a certain size without violating the protocol rules.

This document also describes events that may cause an LSR to issue event logs at a per-packet rate. It is critically important that implementations rate-limit such logs.