[c-nsp] Cisco 3550 Vlan Interface Graphing

[Seth Mattinen]

William Jackson wrote:
>  
> 
> Hi all
> 
>  
> 
> We have a 3550 with some SVI interfaces.  We wish to graph these in
> MRTG/Cacti but do not seem to be getting valid readings.
> 
> We also monitor the etherchannel uplink from that switch and this shows
> traffic properly.
> 
>  
> 
> Is there a known issue with the vlan interfaces or could it be that
> because the switch uses CEF switching, the vlan interface counters are
> not modified accordingly?
> 
>  
> 
> Any tips would be gratefully appreciated?
> 
>  

You can't; the interface counters on the 3550 only update for physical 
interfaces. You'll get some counter action, but it's nowhere near 
accurate. It's a platform limitation.

~Seth