broadcast stormcontrol percentage

Unanswered Question
Apr 30th, 2009

If you configure a percentage, is this based on the interface speed or the actual speed.


For example if I configure

1% on int G1/0/1 but the port auto-negotiates to a speed of 10 MB.


is the thresshold 1% of 10MB or from 1Gig


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Giuseppe Larosa Thu, 04/30/2009 - 04:07

Hello Davy,


good question.


documentation never talks of speed but only of bandwidth


in command reference


http://www.cisco.com/en/US/docs/ios/interface/command/reference/ir_s7.html#wp1012391


and also in configuration guide


http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SXF/native/configuration/guide/storm.html


the feature description tells of 1-seconds interval controlling inbound traffic.

The implementation is hardware checking the I/G bit (less significant bit of most significant byte of the MAC address).


Being configured as a percentage I think it is a percentage of actual speed of the link.


To be sure you should perform some tests.


Hope to help

Giuseppe


davy.timmermans Thu, 04/30/2009 - 04:16

The "problem" is that you've to pick a relative big value to cover auto-negotiation to 10Mbps.


If it was the bandwidth of the interface you could say for example 1Mbps (even if the port negotiates to 10Mbps). It would be more predictable

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