Qtech QSW-3200-28FC [103/136] Loopback test command
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Qtech QSW-3200-28FC [103/136] Loopback test command

Qtech QSW-3200-24T [103/136] Loopback test command
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Москва, Новозаводская ул., 18, стр. 1
92
14.4.4 Loopback test command
In global configuration mode, loopback command is used to test exterior of all interfaces; in
interface configuration mode, loopback command is used to test whether the interface is
normal, and it can be divided into interior and exterior. When exterior testing, exterior wire
must be inserted (receiving and sending lines of RJ 45 connected directly). Use 4 diferent
wires when the speed is less than 100M.
Using loopback command to do the loopback test, interface cannot transmit data packet
correctly, and it will be automatically ended after a certain time. If shutdown command is
executed, loopback test fails; when loopback test is executing, speed, duplex, mdi, vct and
shutdown operations are forbindden. After exterior test, pull out the exterior wire to avoid
abnormal communication.
Loopback on all interfaces:
loopback { internal | external }
Loopback on specified interface:
loopback { external | internal }
External means external loopback and internal means internal loopback
For example:
! Loopback on interface Ethernet 0/1
QTECH(config-if-ethernet-0/1)#loopback external
! Loopback on all interfaces
QTECH(config)#loopback internal
14.4.5 Administration IP address restriction
Managed ip address restriction can restrict host IP address or some network interface of
switch by restricting web, telnet and snmp agent, but other IP address without configuration
cannot manage switch. By default, three server possess an address interface of 0.0.0.0, so
users of any IP address can manage switch. Different IP address and mask mean different
information. The mask in reverse which is 0.0.0.0 means host address, or it means network
interface. 255.255.255.255 means all hosts. When enabling a configuration, an item of 0.0.0.0
must be deleted. When receiving a packet, judge the IP address whether it is in the range of
managed IP address. If it does not belong to it, drop the packet and shutdown telnet
connection.
login-access-list { web | snmp | telnet } ip-address wildcard
Web means accessing IP address restriction of web server; snmp means accessing IP
address restriction of snmp agent; telnet means accessing IP address restriction of telnet;
ipaddress means IP address; wildcard means mask wildcard which is in the form of mask in
reverse. 0 means mask this bit, and 1 meams does not mask this bit. When mask in reserve is
0.0.0.0, it means host address, and 255.255.255.255 means all hosts. Use the no command to
delete corresponding item.
For example:
! Configure ip address allowed by telnet management system to be 192.168.0.0/255.255.0.0
QTECH(config)#login-access-list telnet 192.168.0.0 0.0.255.255
QTECH(config)#no login-access-list telnet 0.0.0.0 255.255.255.255
Use show login-access-list command to display all ip address allowed by web, snmp, telnet
management system.
show login-access-list

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