Identify the interface name and host

In Cacti  go to 'New Graphs' Select the correct Host

In Graph Types select 'SNMP High Speed Interface Statistics'

In the search box type 'interface name' and press go

This will list the interfaces that match the name

Note down interface index number in the first column

In cacti go to System utilities → Click on 'View Poller cache' 

Select the correct host and enter the interface index number in the search bar and click Go

Identify the data source and note down the RRD file number

In cacti click 'Data Sources' click any of the listed data sources

once displayed change the id number in the URL with the data source number

http://cacti.geant.net/cacti/data_sources.php?action=ds_edit&id=20895

note down the description of the data source 'lon-fra__InfiniCortex_TEIN-PSNC_15042'

In Cacti go to 'Graph Management'

Enter the host and in the search box 'description of the data source'

select the graph with error in description

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