i'm playing with the 'storm-control broadcast' feature on C4K [12.2(50)SG] and C6K [12.2(33)SXH1]
i've tried three variants of the config line:
storm-control broadcast level 1.00
storm-control broadcast level 1.10
storm-control broadcast level 5.50
and used sniffers, on both sides of the 'storm-controlled' port, to examine behavior. the feature seems to work as i would have predicted: i can generate a spike of broadcast traffic (by inserting a mini-switch with a loop of cable stuck in it), but after a second or so, Catalyst shuts off in-bound traffic, and the rest of the broadcast domain returns to normal. the 'storm-controlled' port drops all in-bound traffic. after ~30 seconds, the 'storm-controlled' port drops all out-bound traffic, too, and the end-station is entirely isolated. remove the loop and this state persists for ~30 seconds. then the port reverts to normal (i.e. passing traffic in both directions).
this all seems predictable to me. however, when i read the documentation, i think i see an error:
"If you enable broadcast traffic storm control, and broadcast traffic exceeds the level within a 1-second traffic storm control interval, traffic storm control drops all broadcast traffic until the end of the traffic storm control interval."
if i removed the word 'broadcast' from "drops all broadcast traffic", then i would agree with the documentation. but as it stands, i would claim that the documentation does not accurately describe how this feature functions.
has anyone else experimented with this feature? would you agree that the feature functions as i describe it? or as the documentation describes it?
tia,
--sk
stuart kendrick
fhcrc
