Does everything connected to the switch need to receive these broadcasts? If not, try segmenting the network (if possible) with multiple broadcast domains (one being the special application/broadcast segment) and use inter-vlan routing to have each segment talk to each other.
Good idea! We already ssegmented the network. The router-interface in the so called "special broadcast segment" must be protected from the broadcast. I tryed an acl that denyes the broadcast address but "sh proc cpu" told me 99% CPU-load.
Is there an other way to protect this vlan interface from broadcast?
You could try setting up a private vlan for the devices that need to receive the broadcasts. That way you won't need to use a different subnet just for them. Some port would need to be defined as the promiscuous port so that data could flow in and out of the pvlan. I've done this on smaller 3750 switches, but not on a 6500, so you definitely would want to test it first.
Just double-checking, but your not having any issues with stp, right? I work with very busy 6500's and the only time I seen them climb up the cpu ladder is when I got some bad stp problems. Give that some research. You might be barking up the wrong tree.
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