Alcatel-Lucent 7450 ESS Series Configuration Manual page 23

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If the source IP address matches a discard/blackhole route, the packet is treated as if it failed uRPF
check.
7450 ESS OS Router Configuration Guide
If uRPF is in loose mode, uRPF check succeeds.
 If uRPF is in strict mode, then:
 uRPF check succeeds if one of the following is true:
 The source IP address of the packet matches any of the routes that can be
originated from this specific interface.
 The source IP address of the packet doesn't match any specific routes in the
forwarding table.
 uRPF check fails if the following is true:
 The source IP address of the packet matches a route in the forwarding table, but
the next-hop of the route is not on this specific interface.
IP Router Configuration
Page 23