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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 13 Configuring CEF for PFC2 and PFC3A
Understanding How Layer 3 Switching Works
Figure 13-2 IPX CEF Example Topology
Understanding the NetFlow Statistics
Note With Supervisor Engine 720 (MSFC3), IPX routing is done through the software.
These sections describe NetFlow statistics:
• NetFlow Statistics Overview, page 13-11
• NetFlow Table Entry Aging, page 13-12
• Flow Masks, page 13-12
NetFlow Statistics Overview
CEF for PFC2/PFC3A generates flow statistics for Layer 3-switched traffic, which are stored in the
NetFlow table. NetFlow statistics can be displayed with show commands and are also available to
NetFlow Data Export (NDE).
Note A NetFlow table with more than 32,000 entries increases the probability that there will be insufficient
room to store statistics. To reduce the number of entries in the NetFlow table, you can exclude specified
IP protocols from the statistics or use the least granular flow mask (see the “Excluding the IP Protocol
Entries from the NetFlow Table” section on page 13-31).
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