Users Guide

Table Of Contents
Layer 2 Switching Commands 565
User Guidelines
Reducing the delay allows IPDT to discover devices more quickly. Reducing
the delay to too small of a value may cause IPDT to query a device during the
quiet period after the host has sent a gratuitous ARP. The ARP probe may
confuse the host and require the host interface to be reset. Use of the ip
device tracking probe auto-source fallback may help to ameliorate this issue.
Some network implementations have had good results with the delay set to
around 10 seconds.
Command History
Command introduced in version 6.6.0 firmware.
Example
This example globally enables IPDT and sets the transition delay to 10
seconds.
console(config)#ip device tracking
console(config)#ip device tracking probe delay 10
ip device tracking probe auto-source fallback
Use the ip device tracking probe auto-source fallback command to configure
the source IP address sent in ARP probes. Use the no form of the command
to use the default IP address in ARP probes.
Syntax
ip device tracking probe auto-source fallback
host-ip mask
override
no ip device tracking probe auto-source fallback
host-ip
—An IPv4 host address in dotted quad notation. Only non-masked
bits should be set in the IP address (e.g., 0.0.0.1).
mask
—An IPv4 mask used for source IP of the IPDT entries in dotted
quad notation (e.g., 255.255.0.0). The ARP probe destination IP address is
the inverse of the mask AND’d with the host-ip address parameter which is
then OR’d with the destination IP address AND’d with the mask.