how to configure broadcast storm control Cisco 2960 switch

[PdhineshK]

Hi Team,

I would like to know the command to configure the broadcast storm control and what is the recommended level in cisco 2960 switch.

[paul driver]

Hello

Storm Control is interface specific, it can be applied to surpress ingress traffic based on thresholds

Bit per Secosnd
Packets per second
% of interface speed

Any violation of these thresholds can either shutdown the interface or send a trap message to inform the admin of that threshold being reached.

example:
int x/x

storm-control broadcast level 1.00

exit

sh storm-control broadcast

The above will apply a threshold of 1mbps on a 100mb interface or 10mb on a gigabit interface.

I have found to get a good baseline apply storm control with a high threshold for a week or so then reduce the value to accommodate your network.

Plagiarized from Cisco:
•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 you enable broadcast and multicast traffic storm control, and the combined broadcast and multicast traffic exceeds the level within a 1-second traffic storm control interval, traffic storm control drops all broadcast and multicast traffic until the end of the traffic storm control interval.
 
•If you enable broadcast and multicast traffic storm control, and broadcast traffic exceeds the level within a 1-second traffic storm control interval, traffic storm control drops all broadcast and multicast traffic until the end of the traffic storm control interval.
 
•If you enable broadcast and multicast traffic storm control, and multicast traffic exceeds the level within a 1-second traffic storm control interval, traffic storm control drops all broadcast and multicast traffic until the end of the traffic storm control interval

res

Paul

[BorislavPenchev0962]

Hello,

i have issues with the broadcast storm control on same switch model too. when I test broadcast storm, SSH access to the switch is cut; when I stop it, I can access the switch immediately; I tried to access the switch from another port, but have the same issue;

here is port config:

interface GigabitEthernet1/0/3
 network-policy 1
 switchport access vlan 31
 switchport mode access
 srr-queue bandwidth share 1 40 45 15
 priority-queue out 
 mls qos trust dscp
 storm-control broadcast level bps 10m
 storm-control multicast level bps 10m
 storm-control action trap
 spanning-tree portfast edge
 spanning-tree bpduguard enable
 ip dhcp snooping limit rate 25

should I fix something in it ?

Best Regards

[Reza Sharifi]

Remove:

storm-control broadcast level bps 10m
 storm-control multicast level bps 10m

and then add these commands and test again.

storm-control broadcast level 1.00
storm-control multicast level 1.00

HTH

[BorislavPenchev0962]

with this configuration management interface freezes again;

while ping from PC -> Switch1---Switch2 <- PC is running fine; when i stop the broadcast simulator tool i can immediately access the switch over ssh;