Configuring Dai Logging - Cisco 7604 Configuration Manual

Chapter 38 Configuring Dynamic ARP Inspection

Configuring DAI Logging

These sections describe DAI logging:
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DAI Logging Overview
When DAI drops a packet, it places an entry in the log buffer and then generates system messages on a
rate-controlled basis. After the message is generated, DAI clears the entry from the log buffer. Each log
entry contains flow information, such as the receiving VLAN, the port number, the source and
destination IP addresses, and the source and destination MAC addresses.
A log-buffer entry can represent more than one packet. For example, if an interface receives many
packets on the same VLAN with the same ARP parameters, DAI combines the packets as one entry in
the log buffer and generates a single system message for the entry.
If the log buffer overflows, it means that a log event does not fit into the log buffer, and the display for
the show ip arp inspection log privileged EXEC command is affected. Two dashes ("--") appear instead
of data except for the packet count and the time. No other statistics are provided for the entry. If you see
this entry in the display, increase the number of entries in the log buffer or increase the logging rate.
Configuring the DAI Logging Buffer Size
To configure the DAI logging buffer size, perform this task:
Command
Step 1
Router# configure terminal
Step 2
Router(config)# ip arp inspection log-buffer
entries number
Router(config)# no ip arp inspection log-buffer
entries
Step 3
Router(config)# do show ip arp inspection log |
include Size
This example shows how to configure the DAI logging buffer for 64 messages:
Router# configure terminal
Enter configuration commands, one per line.
Router(config)# ip arp inspection log-buffer entries 64
Router(config)# do show ip arp inspection log | include Size
Total Log Buffer Size : 64
OL-4266-08
DAI Logging Overview, page 38-13
Configuring the DAI Logging Buffer Size, page 38-13
Configuring the DAI Logging System Messages, page 38-14
Configuring DAI Log Filtering, page 38-14
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Purpose
Enters global configuration mode.
Configures the DAI logging buffer size (range is
0 to 1024).
Reverts to the default buffer size (32).
Verifies the configuration.
End with CNTL/Z.
Configuring DAI
38-13