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pieterj
Beginner

SCP Triggers Unicast storm controll

Just wondering if anyone has encountered this problem before.

I have tested this on a 2950, 2960 and 3560 and they all seem to react the same

When we have devices connected to ports with Unicast storm controll enabled traffic passes without any problems. as soon as we start a SCP file transfer it triggers unicast storm controll. All other forms of file transfer works fine.

Here is the sw version info from the 2960 I just tested it on

Switch Ports Model              SW Version            SW Image                

------ ----- -----              ----------            ----------              

*    1 24    WS-C2960G-24TC-L   12.2(58)SE2           C2960-LANBASEK9-M

I have confirmed that both devices mac addresses are visible and valid in the mac address table.

May  2 14:30:14.262 NZST: %STORM_CONTROL-3-FILTERED: A Unicast storm detected on Gi0/21. A packet filter action has been applied on the interface.

May  2 14:30:27.348 NZST: %STORM_CONTROL-3-FILTERED: A Unicast storm detected on Gi0/21. A packet filter action has been applied on the interface.

May  2 14:33:55.746 NZST: %STORM_CONTROL-3-FILTERED: A Unicast storm detected on Gi0/21. A packet filter action has been applied on the interface.

interface GigabitEthernet0/21

switchport trunk allowed vlan 2128

switchport mode trunk

storm-control broadcast level 5.00

storm-control multicast level 5.00

storm-control unicast level 10.00

sw12-srv.alb#sho storm-control unicast

Interface  Filter State   Upper        Lower        Current

---------  -------------  -----------  -----------  ----------

Gi0/21     Forwarding       10.00%       10.00%        9.96%  

2 REPLIES 2
Andrew Cink
Beginner

Are you sure it's not just utilization is hitting the target level? Maybe because SCP is encrypted, the overhead is pushing the utilization higher than the other copying methods?

Try checking the utilization, try increasing the storm-control amount to see if it still happens at 15% or 20%?

Andy