IP Router Configuration Command Reference
168 Router Configuration Guide
arp-limit
Syntax arp-limit limit [log-only] [threshold percent]
no arp-limit
Context config>router>interface
Description This command configures the maximum amount of dynamic IPv4 ARP entries that can be learned on
an IP interface.
When the number of dynamic ARP entries reaches the configured percentage of this limit, an SNMP
trap is sent. When the limit is exceeded, no new entries are learned until an entry expires and traffic to
these destinations will be dropped. Entries that have already been learned will be refreshed.
The no form of the command removes the arp-limit.
Default 90 percent
Parameters log-only — Enables the warning message to be sent at the specified threshold percentage, and also
when the limit is exceeded. However, entries above the limit will be learned.
percent — The threshold value (as a percentage) that triggers a warning message to be sent.
Values 0 to 100
limit — The number of entries that can be learned on an IP interface expressed as a decimal
integer. If the limit is set to 0, dynamic ARP learning is disabled and no dynamic ARP entries
are learned.
Values 0 to 524288
arp-timeout
Syntax arp-timeout seconds
no arp-timeout
Context config>router>interface
Description This command configures the minimum time, in seconds, an ARP entry learned on the IP interface is
stored in the ARP table. ARP entries are automatically refreshed when an ARP request or gratuitous
ARP is seen from an IP host. Otherwise, the ARP entry is aged from the ARP table. If the arp-timeout
value is set to 0 seconds, ARP aging is disabled.
The no form of the command reverts to the default value.
Default 14400 seconds (4 hours)
Parameters seconds — The minimum number of seconds a learned ARP entry is stored in the ARP table,
expressed as a decimal integer. A value of 0 specifies that the timer is inoperative and learned
ARP entries will not be aged.
Values 0 to 65535
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