SNMP OID for 30 s input/output rate

[NetworkReaders]

Hi,

I want to know the SNMP OID for polling 30s input and output rates of an interface. I am using Cisco 2821. IOS is 12.4(22)T

I have tried to search and found these:

http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?objectInput=1.3.6.1.4.1.9.2.2.1.1.6&translate=Translate&submitValue=SUBMIT&submitClicked=true

http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?objectInput=1.3.6.1.4.1.9.2.2.1.1.8&translate=Translate&submitValue=SUBMIT&submitClicked=true

they will give the input/output rates for 5 min. I am interested in knowing the OIDs for 30 s interval.

I have already set the interface load interval as 30s.

Please help.

Thanks.