sFlow is a sampling technology for monitoring networks. You can monitor specified incoming data flows by including the copy-sflow keyword in rules within an ACL applied to a device.
In order for sFlow to function, the sFlow collector must be globally configured. For details, refer to the Extreme SLX-OS Monitoring Configuration Guide.
device# configure terminal
device(config)# ip access-list extended ext-vfour1
device(conf-ipacl-ext)# permit 30.30.30.0 255.255.255.0 any copy-sflow device(conf-ipacl-ext)# deny 31.31.31.0 255.255.255.0 copy-sflow
device(config)# interface ethernet 0/1 device(conf-if-eth-0/1)# ip access-group ext-vfour1 in