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New Member

storm-control values

I'm using a 2924XL and am trying to control some multicast and broadcast storms. Any suggestions as to good values to use for the rise and fall perameters? Also, what are the suggestions for the actions to be taken?

1 ACCEPTED SOLUTION

Accepted Solutions

Re: storm-control values

a) What are the numbers shown by

sh port storm-control multicast ....

command?

b) I forgot to mention that you need to configure

port storm-control multicast action filter

to filter out the multicasts above the rise thershold.

The default action doing nothing.

Regards,

Milan

4 REPLIES

Re: storm-control values

Default values should be OK.

If you know quite well the traffic in your network you can increase them a little.

This is what I'm using on a port connecting a Ghost (an application using multicasts) server to my network:

port storm-control broadcast action filter

port storm-control broadcast threshold rising 2500 falling 1500

port storm-control multicast action filter

port storm-control multicast threshold rising 3000 falling 2000

Regards,

Milan

New Member

Re: storm-control values

If the defaults are supposed to work, then perhaps what I'm getting are not broadcast or multicast storms. Sounds like I need to do some more digging.

Re: storm-control values

a) What are the numbers shown by

sh port storm-control multicast ....

command?

b) I forgot to mention that you need to configure

port storm-control multicast action filter

to filter out the multicasts above the rise thershold.

The default action doing nothing.

Regards,

Milan

New Member

Re: storm-control values

I started off with the defaults, and yes, I did set the action to filter.

However, your previous message led me to look further under the assumption that this is not a broadcast or multicast storm. A co-worker noticed on the serial interfaces some errors in additions to the broadcasts. We then noticed a pattern on other serial interfaces. Turns out, a bad T-3 on our carrier's network was causing errors on numerous T-1s connecting to several routers.

So, the assumption turned out to be correct - it was not a broadcast or multicast storm. Although both were higher than normal, the percentages never rose above 20%.

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