Is there any way to get octet counters for individual subinterfaces on a VLAN trunk port on, say, 2900 or 3500 series? - For monitoring purposes.
Example: Port A is a trunk of VLANs 2,7,8
I can get the total sum of all the data (VLANs 2,7,8) in the physical port A by just looking at SNMP ifOctets, but is there any way to know how many bytes pass through each of the subinterfaces? I know that the SNMP counters for VLAN interfaces are wrong due to how the hardware works.
From what I have read, this is completely impossible??
Yes that is true. I do not know enough about the hardware, but could it be possible to force the switching to go through CPU? I know about "no ip route-cache" but that does not apply in here, right? Is there any other similar command for 2900 series?
Looking it at a different angle and forgetting SNMP. With Netflow it could be possible in my opinion - but even then it is difficult. Would need to setup the collector to aggregate all flows per VLAN (looking at source/destination subnets). Which is a lot of work. And anyways not supported on the hardware I have.
I just cannot believe that it is impossible, surely people need to know this kind of statistics and have found a way to do it.
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