| Description | Identifies the source of the data for the sFlow sampler.
The following data source types are currently defined:
- ifIndex.
DataSources of this traditional form are called 'port-based'.
Ideally the sampling entity will perform sampling on all flows
originating from or destined to the specified interface.
However, if the switch architecture only permits input or
output sampling then the sampling agent is permitted to only
sample input flows input or output flows. Each packet must
only be considered once for sampling, irrespective of the
number of ports it will be forwarded to.
Note: Port 0 is used to indicate that all ports on the device
are represented by a single data source.
- sFlowPacketSamplingRate applies to all ports on the
device capable of packet sampling.
- sFlowCounterSamplingInterval applies to all ports.
- smonVlanDataSource.
A dataSource of this form refers to a 'Packet-based VLAN'
and is called a 'VLAN-based' dataSource. is the VLAN
ID as defined by the IEEE 802.1Q standard. The
value is between 1 and 4094 inclusive, and it represents
an 802.1Q VLAN-ID with global scope within a given
bridged domain.
Sampling is performed on all packets received that are part
of the specified VLAN (no matter which port they arrived on).
Each packet will only be considered once for sampling,
irrespective of the number of ports it will be forwarded to.
- entPhysicalEntry.
A dataSource of this form refers to a physical entity within
the agent (e.g., entPhysicalClass = backplane(4)) and is called
an 'entity-based' dataSource.
Sampling is performed on all packets entering the resource (e.g.
If the backplane is being sampled, all packets transmitted onto
the backplane will be considered as single candidates for
sampling irrespective of the number of ports they ultimately
reach).
Note: Since each DataSource operates independently, a packet
that crosses multiple DataSources may generate multiple
flow records. |