Alcatel-Lucent 7450 Manual page 582

Disabling TTL Propagation in an LSP Shortcut
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.
Similarly, when the no form is enabled for transit packets, TTL propagation is disabled on all 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.
Page 582 7450 ESS MPLS Guide