Alcatel-Lucent 7450 ESS Series, Руководство по настройке, Страница: 481 / 540

Cflowd
7450 ESS OS Router Configuration Guide Page 481
Figure 25: V5, V8, V9, V10, and Flow Processing
1. As flows are expired from the active flow cache, the export format must be determined, either
Version 5, Version 8, Version 9, and Version 10.
2. If the export format is Version 5 or Version 9 and Version 10, no further processing is per-
formed and the flow data is accumulated to be sent to the external collector.
3. If the export format is Version 8, then the flow entry is added to one or more of the configured
aggregation matrices.
As the entries within the aggregate matrices are aged out, they are accumulated to be sent to
the external flow collector in Version 8 format.
The sample rate and cache size are configurable values. The cache size default is 64K flow entries.
A flow terminates when one of the following conditions is met:
• When the inactive timeout period expires (default: 15 seconds). A flow is considered
terminated when no packets are seen for the flow for N seconds.
• When an active timeout expires (default: 30 seconds). Default active timeout is 30
minutes. A flow terminates according to the time duration regardless of whether or not
there are packets coming in for the flow.
• When the user executes a clear cflowd command.
• When other measures are met that apply to aggressively age flows as the cache becomes
too full (such as
overflow percent
).
DATA AGED
FROM ACTIVE
FLOW CACHE
V5/V8/V9/V10
FORMAT
V8
v5/v9/v10
FORMAT AND
SEND V5 RECORD
TO EXTERNAL
COLLECTOR
ADD ENTRY
V8 AGGREGATE
FLOW CACHE
V8 AGGREGATE
FLOW CACHE
V8 AGGREGATE
FLOW CACHE
AGE AGGREGATE
FLOWS
FORMAT AND
SEND V8 RECORD
TO EXTERNAL
COLLECTOR