Command Manual – MPLS Basics
H3C S9500 Series Routing Switches
Chapter 1 MPLS Basics Configuration Commands
1-79
Description
Use the
ttl expiration pop
command to specify that the ICMP response message be
transported back along the IP route when the TTL of an MPLS packet expires.
Use the
undo ttl expiration pop
command to specify that the ICMP response be
transported back along the LSP when the TTL of an MPLS packet expires.
By default, the ICMP response message of an MPLS packet with a one-level label is
transported back along the IP route.
Note that configuring the
undo mpls
command will remove the configuration of the
ttl
expiration pop
command.
Related commands:
ttl propagate
.
Examples
# Specify that the ICMP response be transported back along the LSP when the TTL of
an MPLS packet expires
<Sysname> system-view
[Sysname] mpls
[Sysname-mpls] undo ttl expiration pop
1.1.56 ttl propagate
Syntax
ttl propagate
{
public
|
vpn
}
undo ttl propagate
{
public
|
vpn
}
View
MPLS view
Default Level
2: System level
Parameters
public
: Enables MPLS IP TTL propagation for public network packets.
vpn
: Enables MPLS IP TTL propagation for VPN packets.
Description
Use the
ttl propagate
command to enable MPLS IP TTL propagation for either public
network packets or VPN packets.
Use the
undo ttl propagate
command to disable the function.
By default, MPLS IP TTL propagation is enabled for only public network packets.
