sample-once
Syntax
sample-once;
Hierarchy Level
[edit forwarding-options sampling]
Description
Explicitly sample a packet
for active monitoring only once. When you configure the sample-once
statement, the ingress interface sets a flag for any packets that it selects for
sampling, and the egress interface does not sample any flagged packets. Setting this
option avoids duplication of packets in cases where sampling is enabled at both the
ingress and egress interfaces and simplifies analysis of the sampled traffic.
The sampling works independently on the ingress and egress interfaces. If the
sample rate is 1, the ingress interface samples and flags all
packets arriving at the interface. However, if the sample rate
is higher than 1, then the ingress interface may sample and flag only a subset
of packets, as determined by the configured sampling parameters. The ingress and
egress interfaces may contain different sets of packets in their sampling
windows. As a result, if the ingress interface does not sample (and flag) a
packet in a given sampling window, the egress interface may still sample that
same packet as part of its sampling window.
Required Privilege Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 9.6.