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:
1. A TTL-expired ICMP packet is constructed.
2. The destination address of ICMP packet is set to the source address of the IP packet
that was encapsulated in the MPLS packet.
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JunosE 11.2.x BGP and MPLS Configuration Guide