Pakcet sampling after filtering

From: the keralite <>
Date: 04/02/10
Message-ID: <>

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?

Received on Fri Apr 2 14:00:21 2010

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