Ttl Expiration Enable; Ttl Expiration Pop - HP 5800 series Command Reference Manual

destination-ip-addr-header: Specifies the destination address in the IP header of the MPLS echo request
messages. It can be any address on segment 127.0.0.0/8—any local loopback address.
Examples
# Locate an error along the LSP to 3.3.3.9.
<Sysname> tracert lsp ipv4 3.3.3.9 32
LSP Trace Route FEC: LDP IPV4 PREFIX 3.3.3.9/32 , press CTRL_C to break.
TTL Replier
0
1 10.4.5.1
2 100.1.4.2
3 100.1.2.1

ttl expiration enable

Description
Use the ttl expiration enable command to enable the device to send back an ICMP TTL exceeded
message when it receives an MPLS TTL expired packet.
Use the undo ttl expiration enable command to disable sending back of ICMP TTL exceeded messages
for MPLS TTL expired messages.
By default, this function is enabled.
Related commands: ttl expiration pop.
Syntax
ttl expiration enable
undo ttl expiration enable
View
MPLS view
Default level
2: System level
Parameters
None
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

ttl expiration pop

Description
Use the ttl expiration pop command to configure the system to use IP routes to send back the ICMP TTL
exceeded messages for TTL-expired MPLS packets.
Time Type Downstream
Ingress 10.4.5.1/[1025]
1 Transit 100.3.4.1/[1024]
63 Transit 100.1.2.1/[3]
129 Egress
112