Alcatel-Lucent 7450 Manual page 677
Ethernet service switch
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The user can enable or disable the propagation of the TTL from the header of an IP packet into the
header of the resulting MPLS packet independently for local and transit packets forwarded over an
LSP shortcut.
By default, the feature propagates the TTL from the header of transit IP packets into the label stack of
the resulting MPLS packets forwarded over the LSP shortcut. This is referred to as Uniform mode.
When the no form of the command is enabled, TTL propagation is disabled on all transit IP packets
received on any IES interface and destined to a route that is resolved to the LSP shortcut. In this case,
a TTL of 255 is programmed onto the pushed label stack. This is referred to as Pipe mode.
Default
shortcut-transit-ttl-propagate
shortcut-local-ttl-propagate
Syntax
[no] shortcut-local-ttl-propagate
Context
config>router>ldp
config>router>mpls
Description
This command configures the TTL handling of locally generated packets for all LSP shortcuts
originating on this ingress LER. It applies to all LDP or RSVP LSPs that are used to resolve static
routes, BGP routes, and IGP routes.
The user can enable or disable the propagation of the TTL from the header of an IP packet into the
header of the resulting MPLS packet independently for local and transit packets forwarded over an
LSP shortcut.
Local IP packets include ICMP Ping, traceroute, and OAM packets, that are destined to a route that is
resolved to the LSP shortcut. Transit IP packets are all IP packets received on any IES interface and
destined to a route that is resolved to the LSP shortcut
By default, the feature propagates the TTL from the header of locally generated IP packets into the
label stack of the resulting MPLS packets forwarded over the LSP shortcut. This is referred to as
Uniform mode.
When the no form of the above command is enabled, TTL propagation is disabled on all locally
generated IP packets, including ICMP Ping, traceroute, and OAM packets, that are destined to a route
that is resolved to the LSP shortcut. In this case, a TTL of 255 is programmed onto the pushed label
stack. This is referred to as Pipe mode.
Default
shortcut-local-ttl-propagate
7450 ESS MPLS Guide
Session Parameters Commands
Page 677
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