3Com 5500-EI PWR Reference Manual page 1191

For DHCP tests, this command is required. For ICMP tests, this command is optional. This
command does not apply to other tests.
For ICMP tests, if a source IP address has been configured with the source-ip command, the
source-interface command cannot change the configured IP address.
For an ICMP test, if a source interface has been configured with the source-interface command,
the test destination address should be configured as the address of the device directly connected
to the interface. Otherwise, the test will fail.
The interface to be specified in this command can be only a VLAN interface.
The interface to be specified must be Up; otherwise the test will fail.
Examples
# Configure the source interface that sends test packets in DHCP tests as VLAN-interface 1.
<Sysname> system-view
System View: return to User View with Ctrl+Z
[Sysname] remote-ping administrator dhcp
[Sysname-remote-ping-administrator-dhcp] test-type dhcp
[Sysname-remote-ping-administrator-dhcp] source-interface Vlan-interface 1
source-ip
Syntax
source-ip ip-address
undo source-ip
View
remote-ping test group view
Parameters
ip-address: Source IP address for a test.
Description
Use the source-ip command to configure the source IP address for the test.
Use the undo source-ip command to remove the configured source IP address.
By default, the IP address of the interface that sends test packets serves as the source IP address.
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