R3303-HP HSR6800 Routers MPLS Command Reference

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Examples
# Disable the system from sending back an ICMP TTL exceeded message when it receives an MPLS TTL
expired message.
<Sysname> system-view
[Sysname] mpls
[Sysname-mpls] undo ttl expiration enable
Related commands
ttl expiration pop
ttl expiration pop
Use ttl expiration pop to configure the system to use IP routes to send back the ICMP TTL exceeded
messages for TTL-expired MPLS packets that have only one level of label.
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.