Wanted to find out what the term "filtering" encompasses in the description of packet sampling in the sFlow spec. The sFlow spec says "Packet Flow Sampling is accomplished as follows: When a packet arrives on an interface, the Network Device makes a filtering decision to determines whether the packet should be dropped. If the packet is not filtered a destination interface is assigned by the switching/routing function. At this point a decision is made on whether or not to sample the packet."
On a network device there could be various kinds of processing happening on the ingress - access control policies that may drop the packet - packet rate limiting mechanisms that may decide to drop the packet - Exception checks like IP TTL, IPv6 Scope check failures etc. which may decide to not forward the packet further. Would the word "filtering" include all the above scenarios? TIA ZC
