16-3
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 16 Configuring NDE
Understanding How NDE Works
Using NDE Filters
By default, all the expired flows are exported until you specify a filter. After specifying a filter, only the
expired and purged flows matching the specified filter criteria are exported. The filter values are stored
in NVRAM and are not cleared when NDE is disabled.
If the flow mask is in destination-ip mode and the NDE filter contains a filter on both source and
destination, only the destination filter is effective. If the flow mask is in destination-ip mode (as shown
in the following display), all the flows with destination address 9.1.2.15 are exported. The source filter
for host 10.1.2.15 is not effective (it is ignored).
Console> (enable) set mls nde flow destination 9.1.2.15/32 source 10.1.2.15/32
Netflow data export: destination filter set to 9.1.2.15/32
Netflow data export: source filter set to 10.1.2.15/32
Console> (enable)
Using Bridged-Flow Statistics
Note The bridged-flow statistics are not supported on Supervisor Engine 720 or Supervisor Engine 32.
You can set the bridged-flow statistics reporting per VLAN. The bridged flows are exported through
NDE when you enable the bridged-flow statistics.
Caution Use this feature carefully. As the NetFlow entries increase in the NetFlow table, the NDE performance
may degrade. See the “NDE Configuration Guidelines” section on page 16-7 for information on
configuring the bridged-flow statistics.
Note You can also enable NetFlow table entry creation on a per-VLAN basis. However, because the
bridged-flow statistics and per-VLAN entry creation use the same mechanism for collecting the
statistics, the VLAN entries may overlap. See the “Specifying NetFlow Table Entry Creation on a
Per-Interface Basis” section on page 13-28.
NDE Versions
NDE on the PFC supports the following NDE versions to export the statistics that are captured on the
PFC for the Layer 3-switched traffic:
• Supervisor Engine 1 and PFC
–
NDE version 5 with software release 7.5 and later releases
–
NDE version 7 with software release 6.1 and later releases
• Supervisor Engine 2 and PFC2
–
NDE version 5 with software release 7.5 and later releases
–
NDE version 7 with software release 6.1 and later releases
• Supervisor Engine 720 and PFC3A/PFC3B/PFC3BXL—NDE versions 5 and 7 (Supervisor
Engine 720 was initially supported in software release 8.1[1]).
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