sFlow IPv4 and IPv6 packets support extended router information, including the IP address of the next-hop router, the outgoing VLAN ID, the source IP address prefix length, and the destination IP address prefix length. This information is collected only if BGP is configured on the switch.
In addition, a configuration statement was introduced that allows the sFlow sampling rate to stay within the maximum sampling rate of 1 out of 64,000 packets. Packet-based sampling is implemented in the hardware, so all of the interfaces can be monitored with very little overhead. However, if traffic levels are unusually high, the hardware generates more samples than it can handle. The extra samples are dropped
by the software rate-limiting algorithm and can cause inaccurate results. You can include the disable-sw-rate-limiter statement at the [edit protocols sFlow] hierarchy to disable the software, allowing the hardware sampling rate to stay within the maximum sampling rate for sFlow.
