HP 5800 Series User Manual

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Use the undo ttl expiration pop command to configure the system to use LSPs to send back the ICMP TTL
exceeded messages for TTL-expired MPLS packets.
By 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.
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.
Related commands: ttl propagate.
Syntax
ttl expiration pop
undo ttl expiration pop
View
MPLS view
Default level
2: System level
Parameters
None
Examples
# Specify that ICMP TTL exceeded messages for MPLS TTL expired packets travel along the LSPs.
<Sysname> system-view
[Sysname] mpls
[Sysname-mpls] undo ttl expiration pop
ttl propagate
Description
Use the ttl propagate command to enable MPLS IP TTL propagation for 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.
Related commands: ttl expiration pop.
Syntax
ttl propagate { public | vpn }
undo ttl propagate { public | vpn }
View
MPLS view
Default level
2: System level
Parameters
public: Specifies public network packets.

HP 5800 Series Specifications

General

Brand	HP
Model	5800 Series
Category	Switch
Language	English