User guide

Packet Over SONET Module Installation and User Guide 3-63
Configuring and Monitoring Flow Statistics
Figure 3-10: NetFlow Collection Architecture Example
Collection Port and Filtering Options
By default, each PoS port maintains statistics for all the flows traversing the SONET link
in both the ingress and egress directions. However, generalized filtering options exist
that enable a port to maintain statistics only for ingress flows, only for egress flows, or
only for selected ingress and/or egress flows.
You can use these filtering options to configure a PoS port to maintain statistics
selectively for only those flows that match a specified filter. Up to 16 filters are
supported for each PoS port: eight filters for ingress flows; eight filters for egress flows.
The filters consist of a {value,mask} pair for each of the following flow components:
destination IP address, source IP address, destination port, source port, and protocol.
Conceptually, the filters work by logically ANDing the contents of each of these five
UDP
Flow-collector
device
Black
Diamond
PoS_024
NetFlow
Black
Diamond
NetFlow
UDP
Flow-collector
device
Black
Diamond
NetFlow
Black
Diamond
NetFlow
Centralized
collector-server
Summarized
data
Network
planning
Accounting/
billing
Profiling
User-specific
applications