D-Link DES-1228/ME Reference Manual page 409

Service
BPDU
BPDU attack happened.
Protecction
BPDU attack automatically
recover
BPDU attack manually recover
DHCP Server Detected untrusted DHCP
Screening server IP address.
DES-1228/ME Metro Ethernet Managed Switch CLI Reference Guide
Port <portNum> enter BPDU under protection state (mode: drop /
block / shutdown)
Port <portNum> recover from BPDU under protection state
automatically
Port <portNum> recover from BPDU under protection state
manually
Detected untrusted DHCP server(IP: <ipaddr>,
405
Informational
Informational
Informational
Informational