Enabling sending of MPLS TTL-expired messages

This feature enables an LSR to generate an ICMP TTL-expired message upon receiving an MPLS packet with a TTL of 1. If the MPLS packet has only one label, the LSR sends the ICMP TTL-expired message back to the source through IP routing. If the MPLS packet has multiple labels, the LSR sends it along the LSP to the egress, which then sends the message back to the source.

To enable sending of MPLS TTL-expired messages:

Step

Command

Remarks

1. Enter system view.

system-view

N/A

2. Enable sending of MPLS TTL-expired messages.

mpls ttl expiration enable

By default, this function is enabled.