how to monitor an interface operational status

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hi,all
I am using dude for monitoring some networks,and have it directly connecting to sc-3750-01 ,but 4 some security reasons,it can’t ping from the dude server to the SC0_PE_002,now i want to monitor the SC0_PE_002’s status,at least i must know the link’s status between sco_pe_002 and the sc-r2811-yh and receive some alerts about status changed ,wat should i do ?
SNMP is active on SC-R2811-YH.