Alcatel-Lucent 7450 Configuration Manual page 138

Router Global Commands
ttl-propagate
Syntax ttl-propagate
Context config>router
Description
This command enables the context to configure TTL propagation for transit and locally generated
packets in the Global Routing Table (GRT) and VPRN routing contexts
Default none
label-route-local
Syntax label-route-local [all | none]
Context config>router>ttl-propagate
Description This command configures the TTL propagation for locally generated packets which are forwarded
over a BGP label route in the Global Routing Table (GRT) context.
For IPv4 and IPv6 packets forwarded using a RFC 3107 label route in the global routing instance,
including 6PE, the all value of the command enables TTL propagation from the IP header into all
labels in the transport label stack. The none value reverts to the default mode which disables TTL
propagation from the IP header to the labels in the transport label stack. This command does not
have a no version.
Note that the TTL of the IP packet is always propagated into the RFC 3107 label itself, and this
command only controls the propagation into the transport labels, for example, labels of the RSVP or
LDP LSP to which the BGP label route resolves and which are pushed on top of the BGP label.
Note that if the BGP peer advertised the implicit-null label value for the BGP label route, the TTL
propagation will not follow the configuration described, but will follow the configuration to which
the BGP label route resolves:
RSVP LSP shortcut:
LDP LSP shortcut:
This feature does not impact packets forwarded over BGP shortcuts. The ingress LER operates in
uniform mode by default and can be changed into pipe mode using the configuration of TTL
propagation for RSVP or LDP LSP shortcut listed.
Default none
Parameters
none — The TTL of the IP packet is not propagated into the transport label stack.
all — The TTL of the IP packet is propagated into all labels of the transport label stack.
Page 138
• configure router mpls shortcut-local-ttl-propagate
• configure router ldp shortcut-local-ttl-propagate
7450 ESS Router Configuration Guide