Configuring Dynamic Arp Inspection; Default Dynamic Arp Inspection Configuration - Cisco IE-3000-8TC Software Configuration Manual

Chapter 24

Configuring Dynamic ARP Inspection

You use the ip arp inspection log-buffer global configuration command to configure the number of
entries in the buffer and the number of entries needed in the specified interval to generate system
messages. You specify the type of packets that are logged by using the ip arp inspection vlan logging
global configuration command. For configuration information, see the
section on page
Configuring Dynamic ARP Inspection
These sections contain this configuration information:
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Default Dynamic ARP Inspection Configuration

Table 24-1
Table 24-1
Feature
Dynamic ARP inspection
Interface trust state
Rate limit of incoming ARP packets
ARP ACLs for non-DHCP environments
Validation checks
Log buffer
Per-VLAN logging
OL-13018-03
24-13.
Default Dynamic ARP Inspection Configuration, page 24-5
Dynamic ARP Inspection Configuration Guidelines, page 24-6
Configuring Dynamic ARP Inspection in DHCP Environments, page 24-7
environments)
Configuring ARP ACLs for Non-DHCP Environments, page 24-8
environments)
Limiting the Rate of Incoming ARP Packets, page 24-10
Performing Validation Checks, page 24-12
Configuring the Log Buffer, page 24-13
shows the default dynamic ARP inspection configuration.
Default Dynamic ARP Inspection Configuration
Configuring Dynamic ARP Inspection
"Configuring the Log Buffer"
(required in non-DHCP
(optional)
(optional)
(optional)
Default Setting
Disabled on all VLANs.
All interfaces are untrusted.
The rate is 15 pps on untrusted interfaces, assuming that
the network is a switched network with a host
connecting to as many as 15 new hosts per second.
The rate is unlimited on all trusted interfaces.
The burst interval is 1 second.
No ARP ACLs are defined.
No checks are performed.
When dynamic ARP inspection is enabled, all denied or
dropped ARP packets are logged.
The number of entries in the log is 32.
The number of system messages is limited to 5 per
second.
The logging-rate interval is 1 second.
All denied or dropped ARP packets are logged.
Cisco IE 3000 Switch Software Configuration Guide
(required in DHCP
24-5