queries on rmon

Hi All,

    I saw in IEWB, wheneven the question ask to "log an event when the interface input octets (ifEntry.10.1) value reaches 45000 per minute", the solution uses "rmon alarm 1 ifEntry.10.1 60 delta rising-threshold 4500..."  The thing that confuses me is the "delta" key word used instead of "absolute"..  can anyone share some explaination on this?  It seems to me that the interface octet polled by SNMP is definately an "absolute" value and the question ask "to log an event when the interface input octets value reaches xxx"?

Cheers,
Ricky

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