>    I am a MRTG newbie, a link which originally used interface Serial0/0,
> now uses Serial2/2. I modify the configuration router.cfg:
> 
> Target[router.2]: 2:public@router
>
[snip]
> 
> Then I deleted the entry in router.ok
> 2:public@router = Serial0/0
> 
[snip]
> 
> except the first entry, other records are zero.
> Any steps I have missed??? Thank you very much!!!
> 
Most likely you are not monitoring the correct interface and yes,
you have probably missed one step.

Have you used either configmaker to create a new config or did you
use snmpwalk (or a similar program) to find out the interface number?

    snmpwalk router public .1.3.6.1.2.1.2.2.1.2

This will provide something similar to

    interfaces.ifTable.ifEntry.ifDescr.1 = "FastEthernet0/0/0"
    interfaces.ifTable.ifEntry.ifDescr.2 = "FastEthernet4/0/0"
    interfaces.ifTable.ifEntry.ifDescr.3 = "E1 1/0/0"
    interfaces.ifTable.ifEntry.ifDescr.4 = "E1 1/0/1"
    interfaces.ifTable.ifEntry.ifDescr.5 = "E1 5/0/0"
    interfaces.ifTable.ifEntry.ifDescr.6 = "E1 5/0/1"
    interfaces.ifTable.ifEntry.ifDescr.7 = "Serial1/0/0:0"
    interfaces.ifTable.ifEntry.ifDescr.8 = "Serial1/0/0:1"
    interfaces.ifTable.ifEntry.ifDescr.9 = "Serial1/0/0:2"
    
As you can see, My serial1 is not number 1 ...
Similar: your interface Serial2/2 is not number 2.
In fact, you may have serial1/1, serial1/2, serial2/1 and serial2/2
and the number will be at least four. (No: I did not say it *is*!)

Regards,
Alex

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