R3303-HP 6600/HSR6600 Routers MPLS Command Reference Guide

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ipv4 dest-addr mask-length: Specifies a FEC by an IPv4 destination address and the mask length. The
value range for the mask-length argument is 0 to 32.
destination-ip-addr-header: Specifies the destination address in the IP header of the MPLS echo request
messages. It can be any address on subnet 127.0.0.0/8—any local loopback address.
Examples
# Locate errors along the LSP to 3.3.3.9/32.
<Sysname> tracert lsp ipv4 3.3.3.9 32
LSP Trace Route FEC: IPV4 PREFIX 3.3.3.9/32 , press CTRL_C to break.
TTL Replier Time Type Downstream
0 Ingress 10.4.5.1/[1025]
1 10.4.5.1 1 Transit 100.3.4.1/[1024]
2 100.1.4.2 63 Transit 100.1.2.1/[3]
3 100.1.2.1 129 Egress
ttl expiration enable
Use ttl expiration enable to enable the device to send back an ICMP TTL exceeded message when it
receives an MPLS TTL expired packet.
Use undo ttl expiration enable to disable sending back of ICMP TTL exceeded messages for MPLS TTL
expired messages.
Syntax
ttl expiration enable
undo ttl expiration enable
Default
This function is enabled.
Views
MPLS view
Default command level
2: System level
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.