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
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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 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
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
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SNMP User Table
The SNMP User Table displays all of the SNMP User's currently 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.
Figure 8- 1. SNMP User Table
To delete an existing SNMP User Table entry, click the ✘ below the Delete heading corresponding to the entry you wish to delete. | 149 |
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