R3303-HP 6600/HSR6600 Routers MPLS Command Reference Guide

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Use undo ttl expiration pop to configure the system to use LSPs to send back the ICMP TTL exceeded
messages for TTL-expired MPLS packets that have only one level of label.
Syntax
ttl expiration pop
undo ttl expiration pop
Default
An ICMP TTL exceeded message is sent back along an IP route when the TTL of an MPLS packet with a
one-level label stack expires.
Views
MPLS view
Default command level
2: System level
Usage guidelines
The configuration does not take effect for an MPLS packet with multiple levels of labels. The ICMP TTL
exceeded message is always sent back along the LSP when the TTL of such a packet expires.
Examples
# Configure the device to use LSPs to send back ICMP TTL exceeded messages for TTL-expired MPLS
packets that have only one level of label.
<Sysname> system-view
[Sysname] mpls
[Sysname-mpls] undo ttl expiration pop
Related commands
ttl propagate
ttl propagate
Use ttl propagate to enable MPLS TTL propagation for public network packets or VPN packets.
Use undo ttl propagate to disable the function.
Syntax
ttl propagate { public | vpn }
undo ttl propagate { public | vpn }
Default
MPLS TTL propagation is enabled only for public network packets.
Views
MPLS view
Default command level
2: System level
Parameters
public: Specifies public network packets.