Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 1 Interface Management Commands
3Com Corporation
1-11
You can create subinterfaces for an Ethernet interface or a serial interface
encapsulated with X.25 or Frame Relay (FR). The subinterface numbered 0 is the
actually corresponding main interface.
Note that executing the undo interface command deletes the defined logical interfaces
(such as Dialer, tunnel, and virtual-template interfaces) and subinterfaces.
Example
# Enter the Ethernet interface view in system view.
[3Com ]interface ethernet 0/0/0
[3Com -Ethernet0/0/0]
# Switch from Ethernet0/0/0 view to the view of the subinterface Serial0/0/0.1.
[3Com -Ethernet0/0/0] interface serial0/0/0.1
[3Com -Serial0/0/0.1]
1.1.9 looptest
Syntax
looptest [ -c count | -p { pattern | special { ascending | descending | random } } | -s
packetsize | -t timeout ] * interface type number
View
Any view
Parameter
-c count: Number of test packets sending attempts, in the range 1 to 4,294,967,295. It
defaults to 5.
-p pattern: Test pattern, a hexadecimal string in the range 0 to FFFFFFFF, for example
ff. The default test pattern is 0x55 interleaved with 0xAA.
ascending: Pads each test packet byte-by-byte with sequences from 0x00 to 0xff
cyclically in ascending order.
descending: Pads each test packet byte-by-byte with sequences from 0x00 to 0xff
cyclically in descending order.
random: Pads each test packet byte-by-byte with a sequence in the range 0x00 to 0xff.
-s packetsize: Test packet size with the 12-byte header excluded. It ranges from 0 to
1688 bytes and defaults to 52 bytes.
-t timeout: Sets the timeout waiting for receiving a sent test packet. It ranges from 0 to
65,535 milliseconds and defaults to 2000 milliseconds.
interface type number: Specifies an interface by its type and number.