Specifying Sampling Options In Filter Entries; Filter Configurations - Alcatel-Lucent 7750 SR OS Configuration Manual

Specifying Sampling Options in Filter Entries

Packets are matched against filter entries to determine acceptability. With cflowd, only the first
packet of a flow is compared. If the first packet matches the filter criteria, then an entry is added to
the cflowd cache. Subsequent packets in the same flow are also sampled based on the cache entry.
Since a filter can be applied to more than one interface (when configured with a
template
sampling on an interface-by-interface basis. The command can be enabled or disabled as needed
instead creating numerous filter versions.
When the
context, the following requirements must be met in order to enable traffic sampling on the specific
interface:
1. Cflowd must be enabled.
2. At least one cflowd collector must be configured and enabled.
3. The
4. The
5. The filter must be applied to a service or a port.

Filter Configurations

CLI Syntax: config>filter>ip-filter>entry#
When a filter policy is applied to a service or port, sampling can be configured so that traffic
matching the associated IP filter entry is sampled when the IP interface is set to cflowd ACL mode
and the
sample)
When the
associated IP filter entry is not sampled if the IP interface is set to cflowd ACL mode.
7750 SR OS Router Configuration Guide
), the
interface-disable-sample
cflowd interface
interface>cflowd interface
information, refer to the Filter Policy Overview sections of the 7750 SR OS Router
Configuration Guide.
config>filter>ip-filter>entry>interface-disable-sample
must be enabled (the default,
modified to
interface-disable-sample
[no] filter-sample
[no] interface-disable-sample
command is enabled. If cflowd is either not enabled (no
filter-sample
or set to the cflowd interface mode, then sampling does not occur.
interface-disable-sample
option is intended to enable or disable traffic
option is configured in the
option must be selected. For configuration
no interface-disable-sample
).
command is enabled, then traffic matching the
scope
config>router> interface
, must be explicitly
filter-
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Cflowd
option