HP 10500 Series Configuration Manual page 279

Figure 105 URPF work flow
URPF works in the following steps:
1. URPF checks source address validity:
Discards packets with a source broadcast address.
Discards packets with an all-zero source address but a non-broadcast destination address. (A
packet with source address 0.0.0.0 and destination address 255.255.255.255 might be a
DHCP or BOOTP packet and cannot be discarded.)
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