Filter
Top Products
Chapter 8 - SNMP Manager
SNMP Settings
Simple Network Management Protocol (SNMP) is an OSI Layer 7 (Application Layer) designed specifically for managing and monitoring network devices.SNMP
enables network management stations to read and modify the settings of gateways,routers,switches,and other network devices.Use SNMP to configure system
features for proper operation,monitor performance and detect potential problems in the Switch,switch group or network.
Managed devices that support SNMP include software (referred to as an agent),which runs locally on the device.A defined set of variables (managed objects) is
maintained by the SNMP agent and used to manage the device.These objects are defined in a Management Information Base (MIB),which provides a standard
presentation of the information controlled by the on-board SNMP agent.SNMP defines both the format of the MIB specifications and the protocol used to
access this information over the network.
The AT-9724TS supports the SNMP versions 1,2c,and 3.You can specify which version of the 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 v1 and v2 management access are:
public – Allows authorized management stations to retrieve MIB objects.
private – Allows authorized management stations to retrieve and modify MIB objects.
SNMPv3 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
allo
wed 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 SNMPv1 while assigning a
higher level of security to another group,granting read/write privileges using SNMPv3.
Using SNMPv3 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
SNMPv3 in that SNMP messages may be encrypted.To read more about how to configure SNMPv3 settings for the Switch read the next section.
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 information 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
r
etrieved by specifying the MIB Object Identifier.MIB values can be either read-only or read-write.
The
AT-9724TS incorporates a flexible SNMP management for the switching environment.SNMP management can be customized to suit the needs of the
networks and the preferences of the network administrator.Use the SNMP V3 menus to select the SNMP version used for specific tasks.
The AT-9724TS supports the Simple Network Management Protocol (SNMP) versions 1,2c, and 3.The administrator can specify the SNMP version used 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.
SNMP settings are configured using the menus located on the SNMP V3 folder of the web manager.Workstations on the network that are allowed SNMP
privileged access to the Switch can be r
estricted with the Management Station IP
Ad
dr
ess menu.
SNMP User Table
The SNMP User T
a
ble
displa
ys all of the SNMP User's cur
rently configured on the Switch.
In the
SNMP Manager folder,click on the SNMP User Table link.This will open the SNMP User Table,as shown below.
Figur
e 8- 1.
SNMP User
T
able
To delete an existing SNMP User Table entry, click the
✘ belo
w the
Delete heading cor
responding to the entry you wish to delete.
149
Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch