problem monitor serial using mrtg/rrdtool

I've set up an mrtg with rrdtool. I have a problem with one of the serials of my linux router. It is always commented out in the config file because "it has a speed of 0". I've tried editing the config file, uncommenting the lines and providing a relative speed for the serial but no rrd file was created hence no graph to display. I've also tried forcing an oid value in the mib-oid of the device in order to change the 0 value using snmpset but it does not accept it. how will i manage to monitor the serial using mrtg???
orcganirAsked:
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mikebernhardtConnect With a Mentor Commented:
I'm not absolutely certain but if no rrd file was created on manual configuration, something more basic than an incorrect mib is happening. Do you have other interfaces on that or a similar server that are monitored successfully? Do you have other interfaces from that server in the same config file that work?

Sometimes I've made mistakes like not having all the config lines with the same rrd file name, or having a duplicate, etc.
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orcganirAuthor Commented:
thanks for the reply. I've already performed several snmpwalks on the device to check and i did get the correct mib for that serial. Yes, there are other serial interfaces on the router but only that serial is being used and it's working very well. I don't have problems with our cisco routers because a relative speed is provided on their mib. But I think you're right, I have to double check on the config files...
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mikebernhardtCommented:
Generally if I have a good config but the mib I'm using is the wrong one, I will still get an RRD file, but there won't be any data in it...
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