[c-nsp] Storm control - find out which vlan hits the limit

["Rolf Hanßen"]

Hello,

I have a switchport interface (6704 card, Sup2T, IOS 15.1(2)SY1) with a
few vlans (L2 + L3 mixed) on it that drops packets caused by storm
control.

sh interfaces counters storm-control:
Port             UcastSupp %     McastSupp %     BcastSupp % 
TotalSuppDiscards
Te9/3                 100.00            0.35            0.35           
5800188

I now would like to find out on which vlan I receive them.
Unfortunatelly the non-unicast counters for all vlan-interfaces show 0,
example:

sh int vl300 | inc cast
  L2 Switched: ucast: 8023503 pkt, 2642606815 bytes - mcast: 0 pkt, 0 bytes
  L3 in Switched: ucast: 120002757406 pkt, 16510187670768 bytes - mcast: 0
pkt, 0 bytes
  L3 out Switched: ucast: 75127991555 pkt, 65410581551697 bytes - mcast: 0
pkt, 0 bytes
     Received 0 broadcasts (0 IP multicasts)

sh vlan id xxx counters also schows zeroes only for all vlans:
Vlan Id                                            : 300
L2 Unicast Packets                                 : 8023503
L2 Unicast Octets                                  : 2642606815
L3 Input Unicast Packets                           : 120008317418
L3 Input Unicast Octets                            : 16512241861042
L3 Output Unicast Packets                          : 75144910816
L3 Output Unicast Octets                           : 65423693432219
L3 Output Multicast Packets                        : 0
L3 Output Multicast Octets                         : 0
L3 Input Multicast Packets                         : 0
L3 Input Multicast Octets                          : 0
L2 Multicast Packets                               : 0
L2 Multicast Octets                                : 0

Is there a way to enable those counters or to find out which vlan receives
those peaks without exporting the traffic to another system
(SPAN,netflow,...)?

kind regards
Rolf