SNMP
Global Configuration
Context
SNMP agent is an agent program on the managed device. The SNMP agent maintains information for the managed device, responds to the requests from the NMS, and sends management data to the NMS. Before the NMS manages a device through SNMP, the SNMP agent must be enabled on the device and a proper SNMP version needs to be selected.
A web system supports SNMPv1, SNMPv2c and SNMPv3. The device and NMS must use the same SNMP version.
If a device is managed by multiple NMSs running different SNMP versions, all the SNMP versions need to be set on the device so that the device can communicate with these NMSs.
Version |
Usage Scenario |
|---|---|
SNMPv1 |
Applicable to small networks with simple networking and low security requirements or small networks with good security and stability, such as campus networks and small enterprise networks. |
SNMPv2c |
Applicable to medium and large networks with low security requirements or with good security but on which services are so busy that traffic congestion may occur. |
SNMPv3 |
Applicable to networks of various scales, especially networks that have strict security requirements and can be managed only by authorized network administrators. For example, SNMPv3 can be used if data between the NMS and managed device needs to be transmitted over a public network. |
Procedure
- Choose and click the Global Configuration tab, as shown in Figure 7-39.
Table 7-18 describes the global configuration parameters.
Table 7-18 Global configuration parametersParameter
Description
SNMP agent
Specifies whether to enable the SNMP agent function.
SNMP version
Specifies the SNMP version.
The device sends extended error code
Specifies whether to enable the device to send extended error codes to the NMS.
Local engine ID
Displays the engine ID of the local SNMP entity.
This parameter cannot be modified.
Device position
Specifies the location of a device.
Contact
Specifies the maintenance contact information.
- Set the parameters.
- Click Apply to complete the configuration.
Community/Group Management
Procedure
- Creating a community
- Choose and click the Community/Group Management tab, as shown in Figure 7-40.
- In the Community (For SNMPv1 and SNMPv2c) area, click Create. The Create Community dialog box is displayed, as shown in Figure 7-41.
Table 7-19 describes the parameters in the dialog box.
Table 7-19 Community parametersParameter
Description
Community name
Specifies the community name.
Access mode
Specifies the permission on a specified MIB view for the community name.
- Read-only
- Read-write
MIB View
Specifies the MIB view that the community name can access.
ACL number
Specifies the ACL number matching the community name.
- Deleting a community
- Choose and click the Community/Group Management tab, as shown in Figure 7-40.
- Select the community you want to delete and click Delete. The system asks you whether to delete the community.
- Click OK.
- Updating community information
- Choose and click the Community/Group Management tab, as shown in Figure 7-40.
- In the Community (For SNMPv1 and SNMPv2c) area, click Refresh.
- Creating a group
- In the Group (For SNMPv3) area, click Create. The Create Group dialog box is displayed, as shown in Figure 7-42.
Table 7-20 describes the parameters in the dialog box.
- In the Group (For SNMPv3) area, click Create. The Create Group dialog box is displayed, as shown in Figure 7-42.
- Modifying a group
- Choose and click the Community/Group Management tab, as shown in Figure 7-40.
- Click a group name to access the Modify Group page. Table 7-20 describes the parameters on the page.
- Modify the configuration parameters. Group Name cannot be modified.
- Click OK.
- Deleting a group
- Choose and click the Community/Group Management tab, as shown in Figure 7-40.
- Select the group you want to delete and click Delete. The system asks you whether to delete the group.
- Click OK.
- Updating group information
- Choose and click the Community/Group Management tab, as shown in Figure 7-40.
- In the Group (For SNMPv3) area, click Refresh.
- Creating a user
- In the User (For SNMPv3) area, click Create. The Create User dialog box is displayed, as shown in Figure 7-43.
Table 7-21 describes the parameters in the dialog box.
Table 7-21 User parametersParameter
Description
User Name
Specifies a user name.
Security Level
Specifies the security level for the user.
Authentication protocol
Sets the authentication protocol to SHA or MD5.
This parameter is available only when Security Level is set to Auth & no-encrypt or Auth & encrypt.
Authentication password
Specifies an authentication password for the user.
This parameter is available only when Security Level is set to Auth & no-encrypt or Auth & encrypt.
Confirm authentication password
Confirms the authentication password.
This parameter is available only when Security Level is set to Auth & no-encrypt or Auth & encrypt.
Encryption protocol
Sets the encryption protocol to DES-56, AES-128, AES-192, AES-256, or 3DES.
This parameter is available only when Security Level is set to Auth & encrypt.
Encryption password
Specifies an encryption password for the user.
This parameter is available only when Security Level is set to Auth & encrypt.
Confirm encryption password
Confirms the encryption password.
This parameter is available only when Security Level is set to Auth & encrypt.
ACL
Specifies the ACL number matching the user.
Click
and select an ACL in the dialog box.
Group Name
Specifies an SNMP group name.
- In the User (For SNMPv3) area, click Create. The Create User dialog box is displayed, as shown in Figure 7-43.
- Modifying a user
- Choose and click the Community/Group Management tab, as shown in Figure 7-40.
- Click a user name to access the Modify User page. Table 7-21 describes the parameters on the page.
- Modify the configuration parameters. User Name cannot be modified.
- Click OK.
- Deleting a user
- Choose and click the Community/Group Management tab, as shown in Figure 7-40.
- Select the user you want to delete and click Delete. The system asks you whether to delete the user.
- Click OK.
- Updating user information
- Choose and click the Community/Group Management tab, as shown in Figure 7-40.
- In the User (For SNMPv3) area, click Refresh.
and select an ACL in the dialog box.
MIB View
Procedure
- Creating a MIB view
- Choose and click the MIB View tab, as shown in Figure 7-44.
- In the MIB View area, click Create. The Create View Rule dialog
box is displayed, as shown in Figure 7-45.
Table 7-22 describes the parameters in the Create View Rule dialog box.
Table 7-22 View rule parametersParameter
Description
View name
Specifies the name of a MIB view.
Rule
Specifies the permission of the MIB view on MIB subtrees.
MIB sub-tree name
Specifies the OID for a MIB subtree, which can be the OID (such as 1.4.5.3.1) or the name (such as system) of the subtree.
To add a data record, click
. Multiple data records can be added. To delete a data record, select it and click
.
- Modifying a MIB view
- Choose and click the MIB View tab, as shown in Figure 7-44.
- Click a MIB view name to access the Modify MIB View page. Table 7-22 describes the parameters on the page.
- Modify the configuration parameters. View Name cannot be modified.
- Click OK.
- Deleting a MIB view
- Choose and click the MIB View tab, as shown in Figure 7-44.
- Select the MIB view you want to delete and click Delete. The system asks you whether to delete the MIB view.
- Click OK.
- Displaying view rules
- Choose and click the MIB View tab, as shown in Figure 7-44.
- Select the MIB view you want to display and click Display View Rule. The system displays the view rules of the MIB view.
- Updating view rules
- Choose and click the MIB View tab, as shown in Figure 7-44.
- In the MIB View area, click Refresh.
. Multiple data records can be added. To
delete a data record, select it and click 
.Trap Setting
Context
This page is displayed only when the SNMP agent status in SNMP Setting is set to ON.
A trap is an alarm message sent from the managed device to the NMS to notify administrators of the network faults. After receiving a trap from a managed device, the NMS does not need to reply.
Procedure
- Configure the trap function.
- Choose and click the Trap Setting tab, as shown in Figure 7-46.
Table 7-23 describes parameters in the Trap Setting area.
Table 7-23 Trap parametersParameter
Description
SNMP Trap
Specifies whether to enable the switch to send traps to the NMS.
TTL of trap messages (s)
Sets the TTL of traps. If the TTL expires, the traps are discarded.
Length of the trap message queue
Specifies the length of the queue for traps sent to target hosts.
Trap Source Interface
Specifies the source port for sending traps.
- Choose and click the Trap Setting tab, as shown in Figure 7-46.
- Create a trap target host.
- Click in to open the page, as shown in Figure 7-47.
Table 7-24 describes parameters in the Create Trap Host dialog box.
Table 7-24 Trap host parametersParameter
Description
Destination host IP address
Specifies the IP address of the target host.
UDP port number of destination host
Specifies the number of the port for receiving traps on the target host.
Trap version
Specifies the SNMP version matching the trap messages, including:
- v1: SNMPv1.
- v2c: SNMPv2c.
- v3: SNMPv3.
User name
Specifies the user name displayed on the NMS.
Security level
This parameter is mandatory when the trap version is v3. Security levels include:
- No-auth&no-encrypt
- Auth&no-encrypt
- Auth&encrypt
- Click in to open the page, as shown in Figure 7-47.
- Modify a trap target host.
- Choose and click the Trap Setting tab, as shown in Figure 7-46.
- Click the IP address of a trap target host you want to modify to access the Modify Trap Host page. Table 7-24 describes the parameters on the page.
- Modify the configuration parameters. Destination host IP address and User name cannot be modified.
- Click OK.
- Delete a trap target host.
- Choose and click the Trap Setting tab, as shown in Figure 7-46.
- Select the trap target host you want to delete and click Delete. The system asks you whether to delete the trap target host.
- Click OK.
- Update trap target host information.
- Choose and click the Trap Setting tab, as shown in Figure 7-46.
- In the Destination host receiving traps area, click Refresh.
