command show the broadcast?

[MUNIR_ENG]

Dears, Whish the good way to show my if the my switch have be broadcast? Im using extreme switches in my network type summit 450x dc

[BradP]

Munir,

That looks absolutely beautiful. The switch output in that screenshot shows very little actual packets going to the CPU.

[MUNIR_ENG]

Thanks for the explain Bard , i did your steps as you told me, i would inform you about the results obtained by steps . and please inform me if the result normal or unstable ?

[EtherMAN]

Another quick way to find this is to do a show port utilization for switch that is ina broadcast loop and the two ports that are looped together will have RX and TX at 100% .. all other ports will only be TX 100%. Disable either one of those two ports and no more loop... Other thing we do on all newer XOS switches put a rate shape on broadcast packets only ...Access/client ports 100 pps ..... Gig Trunk ports 2000 pps..... ten gig trunk ports 5000 pps... looped port will get slowed down b the rate shape and send a trap ....

[BradP]

Munir,

When troubleshooting a broadcast storm, I like to use the "show l2stats" command. This will display the number of packets that have gone to the CPU on a per vlan basis. Before running the command, I will issue a "clear counters" command and then "show l2stats" at a known time (4-5 seconds or so). This way I can determine about how many packets per second have gone to the CPU and can determine which vlans are high or not. If there is a standout vlan, I will then use ELRP in order to find out which ports are looped. Hope this helps.

Brad

[MUNIR_ENG]

grateful. Thank you