Mpls Rules For Ttl Expiration; Figure 52: Ttl Processing On Outgoing Mpls Packets - Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual

Figure 52: TTL Processing on Outgoing MPLS Packets

MPLS Rules for TTL Expiration

MPLS takes the following actions when the TTL in a MPLS label of a received MPLS
packet expires:
A TTL-expired ICMP packet is constructed.
1.
The destination address of ICMP packet is set to the source address of the IP
2.
packet that was encapsulated in the MPLS packet.
MPLS Label Switching and Packet Forwarding
Chapter 2: MPLS Overview
217