Alcatel-Lucent 7450 Configuration Manual page 71

Interaction with Static Route Resolution to an LDP FEC
A static route will continue to be resolved by sarching an LDP LSP which FEC prefix matches the
specified indirect next-hop for the route. In contrast, the LDP shortcut for IGP route resolution
uses the LDP LSP as a route. The most specific route for a prefix will be selected and if both a
static and IGP routes exist, the RTM route type preference will be used to select one.
LDP Control Plane
In order for the LDP shortcut to be usable, an SR-OS router must originate a <FEC, label> binding
for each IGP route it learns of even if it did not receive a binding from the next-hop for that route.
In other words, it must assume it is an egress LER for the FEC until the route disappears from the
routing table or the next-hop advertised a binding for the FEC prefix. In the latter case, the SR-OS
router becomes a transit LSR for the FEC.
An SR-OS router will originate a <FEC, label> binding for its system interface address only by
default. The only way to originate a binding for local interfaces and routes which are not local to
the system is by using the fec-originate capability.
You must use the fec-originate command to generate bindings for all non-local routes for which
this node acts as an egress LER for the corresponding LDP FEC. Specifically, this feature must
support the FEC origination of IGP learned routes and subscriber/host routes statically configured
or dynamically learned over subscriber IES interfaces.
An LDP LSP used as a shortcut by IPv4 packets may also be tunneled using the LDP-over-RSVP
feature.
7450 ESS Router Configuration Guide
IP Router Configuration
Page 71