08-12-2013 08:36 AM - edited 03-07-2019 02:52 PM
Hi,
we configured broadcast storm control on our C6500. We would like now to add multicast storm control, but with another value (bigger) than for broadcast.
The problem is when I configure multicast level, it changes automatically the value for broadcast.
Is it a way to avoid that?
Regards.
D.
08-12-2013 08:49 AM
Hi,
That is a normal behavior. If you configure broadcast at 5% and than later configure multicast at 7%, the router will change the broadcast to 7%.
have a look at this example:
This example shows how the traffic storm control level configured for one mode affects all other modes that are already configured on the Gigabit Ethernet interface 4/10:
Router# show run inter gig4/10
Building configuration...
Current configuration : 176 bytes
!
Router# interface GigabitEthernet4/10
Router# switchport
Router# switchport mode access
Router# storm-control broadcast level 0.5
Router# storm-control multicast level 0.5
Router# spanning-tree portfast edge
Router# end
Router# configure terminal
Router(config)# interface gigabitethernet 4/10
Router(config-if)# storm-control unicast level 0.7
Router(config-if)# end
Router# show interfaces gig4/10 counters storm-control
Port UcastSupp % McastSupp % BcastSupp % TotalSuppDiscards
Gi4/10 00.70 00.70 00.70 0
Router#
config guide:
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/storm.html
HTH
08-12-2013 08:56 AM
This behavior is not really nice as broadcast traffic is normally less important that multicast.
If I have, let's say, video on my network, I would like to have a limit of 50 Mbps for multicast.
Beside that, I want my have a broadcast limit of 5Mbps, to protect my CPU.
Is there a solution?
06-07-2018 05:14 AM
Hi! This thread is quite old, but maybe somebody will still read it. As you can see from the output, the same value applies to UNICAST traffic also, and that's a problem! This is an obvious bug. Is there any solution to it? Best regards.
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