R211x-HP Flexfabric 11900 MPLS Command Reference

19
When TTL propagation is disabled, MPLS sets the label TTL to 255 for packets entering the MPLS network,
and pops the label for packets leaving the MPLS network, without copying the label TTL value to the IP TTL.
The IP tracert facility cannot show the real path in the MPLS network.
After TTL propagation is enabled or disabled, execute the reset mpls ldp command to make the
configuration take effect.
Within an MPLS network, TTL is always copied between the labels of an MPLS packet. The mpls ttl
propagate command affects only the propagation between IP TTL and label TTL.
HP recommends setting the same TTL processing mode on all LSRs of an LSP.
To enable TTL propagation for a VPN, you must enable it on all PE devices in the VPN, so that you can
get the same traceroute result (hop count) from those PEs.
Examples
# Enable TTL propagation for VPN packets.
<Sysname> system-view
[Sysname] mpls ttl propagate vpn
Related commands
reset mpls ldp
snmp-agent trap enable mpls
Use snmp-agent trap enable mpls to enable SNMP notifications for MPLS.
Use undo snmp-agent trap enable mpls to disable SNMP notifications for MPLS.
Syntax
snmp-agent trap enable mpls
undo snmp-agent trap enable mpls
Default
SNMP notifications for MPLS are enabled.
Views
System view
Predefined user roles
network-admin
mdc-admin
Usage guidelines
This command enables MPLS to generate SNMP notifications. The generated SNMP notifications are
sent to the SNMP module.
For more information about SNMP notifications, see Network Management and Monitoring
Configuration Guide.
Examples
# Enable SNMP notifications for MPLS.
<Sysname> system-view
[Sysname] snmp-agent trap enable mpls