mpls ttl expiration enable
Use mpls ttl expiration enable to enable sending MPLS TTL-expired messages.
Use undo mpls ttl expiration enable to disable sending MPLS TTL-expired messages.
Syntax
mpls ttl expiration enable
undo mpls ttl expiration enable
Default
The MPLS TTL-expired messages sending feature is enabled.
Views
System view
Predefined user roles
network-admin
Usage guidelines
This command enables an LSR to generate an ICMP TTL-expired message upon receiving an MPLS packet with TTL being 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 forwards the ICMP TTL-expired message along the LSP of the MPLS packet to the egress node. Then, the egress node sends the message back to the source.
Examples
# Disable sending MPLS TTL-expired messages.
<Sysname> system-view [Sysname] undo mpls ttl expiration enable