User guide

3-66 Packet Over SONET Module Installation and User Guide
Configuring the PoS Module
Enabling and Disabling Flow Statistics
To enable the flow statistics function on the specified SONET port, use the following
command:
enable flowstats ports <portlist>
The flow statistics function is disabled by default.
Flow statistics are collected only on SONET ports that are configured to use the
IP Control Protocol (IPCP). No flow statistics are collected on ports that are
configured to use the Bridging Control Protocol (BCP). You will not be prevented
from enabling the flow statistics function on ports not configured for IPCP, but
statistics will not be collected on those ports.
To disable the flow statistics function on the specified SONET port, use the following
command:
disable flowstats ports <portlist>
The flow statistics function is disabled by default.
Configuring the Export Destination
A single SONET port can distribute statistics across multiple groups of flow-collector
devices. This NetFlow distribution capability makes it possible to create a collection
architecture that scales to accommodate high volumes of exported data. It also offers a
health-checking function that improves the reliability of the collection architecture by
ensuring that only responsive flow-collector devices are included in active export
distribution lists.
The distribution algorithm ensures that all the records for a given flow are exported to
the same collector. The algorithm also ensures that flow records for both the ingress and
egress directions of a TCP or UDP connection are exported to the same collector (when
both flows traverse the same SONET link and both filters are configured to export to
the same group).
NetFlow distribution is enabled by configuring export distribution groups that identify
the addresses of multiple flow-collector devices. You can configure up to 32 export
distribution groups on a BlackDiamond 6800 series switch, and each group can contain
as many as eight flow-collector devices.