The AT-9724TS supports SNMP versions 1,2c,and 3.You can specify which version of SNMP you want to use to monitor and control the Switch.The three
versions of SNMP vary in the level of security provided between the management station and the network device.
In SNMP v.1 and v.2,user authentication is accomplished using 'community strings',which function like passwords.The remote user SNMP application and the
Switch SNMP must use the same community string.SNMP packets from any station that has not been authenticated are ignored (dropped).
The default community strings for the Switch used for SNMP v.1 and v.2 management access are:
public– Allows authorized management stations to retrieve MIB objects.
private – Allows authorized management stations to retrieve and modify MIB objects.
SNMP v.3 uses a more sophisticated authentication process that is separated into two parts.The first part is to maintain a list of users and their attributes that
are allowed to act as SNMP managers.The second part describes what each user on that list can do as an SNMP manager.
The Switch allows groups of users to be listed and configured with a shared set of privileges.The SNMP version may also be set for a listed group of SNMP
managers.Thus,you may create a group of SNMP managers that are allowed to view read-only information or receive traps using SNMP v.1 while assigning a
higher level of security to another group,granting read/write privileges using SNMP v.3.
Using SNMP v
.3 individual users or groups of SNMP managers can be allowed to perform or be restricted from performing specific SNMP management
functions.The functions allowed or restricted are defined using the Object Identifier (OID) associated with a specific MIB.An additional layer of security is
available for SNMP v.3 in that SNMP messages may be encrypted.To read more about how to configure SNMP v.3 settings for the Switch read the section
entitled Management.
Traps
Traps are messages that alert network personnel of events that occur on the Switch.The events can be as serious as a reboot (someone accidentally turned OFF
the Switch),or less serious like a port status change.The Switch generates traps and sends them to the trap recipient (or network manager).Typical traps include
trap messages for Authentication Failure,Topology Change and Broadcast/Multicast Storm.
MIBs
Management and counter inf
ormation are stored by the Switch in the Management Information Base (MIB).The Switch uses the standard MIB-II Management
Information Base module.Consequently,values for MIB objects can be retrieved from any SNMP-based network management software.In addition to the
standard MIB-II,the Switch also supports its own proprietary enterprise MIB as an extended Management Information Base.The proprietary MIB may also be
retrieved by specifying the MIB Object Identifier.MIB values can be either read-only or read-write.
4-9 IP Address Assignment
Each Switch must be assigned its own IP Address,which is used for communication with an SNMP network manager or other TCP/IP application (for example
BOOTP,TFTP).The Switch's default IP address is 10.0.0.1.You can change the default Switch IP address to meet the specification of your networking address
scheme.
The Switch is also assigned a unique MAC address by the factory.This MAC address cannot be changed,and can be found by entering the command "show
switch" into the command line interface,as shown below.
Figur
e 4- 3.
“sho
w s
witch” command
The Switch's MAC address can also be found from the Web management program on the
Switch Information (Basic Settings) window in the
Configurationmenu.
The IP ad
dr
ess f
or the Switch must be set before it can be managed with the Web-based manager.The Switch IP address can be automatically set using BOOTP
or DHCP protocols,in which case the actual address assigned to the Switch must be known.
The IP address may be set using the Command Line Interface (CLI) over the console serial port as follows:
Starting at the command line pr
ompt,
enter the commands
config ipif
System ipaddr
ess xxx.xxx.xxx.xxx/yyy
.yyy
.yyy.yyy
.
Wher
e the x's r
epr
esent
the IP address to be assigned to the IP interface named System and the y's represent the corresponding subnet mask.
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