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Configuring the MLS IP-Directed Broadcasts on the Switch
Clearing the NetFlow Statistics Totals
The clear mls statistics command clears the following NetFlow statistics:
•
•
To clear the NetFlow statistic totals, perform this task in privileged mode:
Task
Clear the NetFlow statistics totals.
This example shows how to clear the NetFlow statistics totals:
Console> (enable) clear mls statistics
All mls statistics cleared.
Console> (enable)
Displaying the NetFlow Statistics Debug Information
The show mls debug command displays the NetFlow statistics debug information that you can send to
your technical support representative for analysis if necessary.
To display the NetFlow statistics debug information, perform this task:
Task
Display the NetFlow statistics debug
information that you can send to your
technical support representative.
The show tech-support command displays supervisor engine system information. Use
Note
application-specific commands to get more information about particular applications.
Configuring the MLS IP-Directed Broadcasts on the Switch
The IP-directed broadcasts are used primarily for ticker-type (stock quote) devices; however, when the
feature is enabled on router interfaces, it provides a means to enable malicious denial-of-service attacks.
An IP-directed broadcast is a datagram that is sent to the broadcast address of a subnet to which the
sending machine is not directly connected. The directed broadcast is routed through the network as a
unicast packet until it arrives at the target subnet, where it is converted into a link layer broadcast. Due
to the IP addressing architecture, only the last router in the chain, the one that is connected directly to
the target subnet, can conclusively identify an IP-directed broadcast.
Before supervisor engine software release 7.2(2), the IP-directed broadcast traffic was handled by
enabling the IP-directed broadcasts using the ip directed-broadcast command on the MSFC. The MSFC
handled the traffic at the process level, which caused high CPU utilization.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
13-36
Total packets that are switched (IP and IPX)
Total packets that are exported (for NDE)
Chapter 13
Command
clear mls statistics
Command
show mls debug
Configuring CEF for PFC2 and PFC3A
OL-8978-04
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Troubleshooting
