16-Network Management and Monitoring Configuration Guide

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04-SNMP configuration
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Configuring SNMP

About SNMP

Simple Network Management Protocol (SNMP) is used for a management station to access and operate the devices on a network, regardless of their vendors, physical characteristics, and interconnect technologies.

SNMP enables network administrators to read and set the variables on managed devices for state monitoring, troubleshooting, statistics collection, and other management purposes.

SNMP framework

The SNMP framework contains the following elements:

·     SNMP manager—Works on an NMS to monitor and manage the SNMP-capable devices in the network.

·     SNMP agent—Works on a managed device to receive and handle requests from the NMS, and sends notifications to the NMS when events, such as an interface state change, occur.

·     Management Information Base (MIB)—Specifies the variables (for example, interface status and CPU usage) maintained by the SNMP agent for the SNMP manager to read and set.

Figure 1 Relationship between NMS, agent, and MIB

 

MIB and view-based MIB access control

A MIB stores variables called "nodes" or "objects" in a tree hierarchy and identifies each node with a unique OID. An OID is a dotted numeric string that uniquely identifies the path from the root node to a leaf node. For example, object B in Figure 2 is uniquely identified by the OID {1.2.1.1}.

Figure 2 MIB tree

 

A MIB view represents a set of MIB objects (or MIB object hierarchies) with certain access privileges and is identified by a view name. The MIB objects included in the MIB view are accessible while those excluded from the MIB view are inaccessible.

A MIB view can have multiple view records each identified by a view-name oid-tree pair.

You control access to the MIB by assigning MIB views to SNMP groups or communities.

SNMP operations

SNMP provides the following basic operations:

·     Get—NMS retrieves the value of an object node in an agent MIB.

·     Set—NMS modifies the value of an object node in an agent MIB.

·     Notification—SNMP notifications include traps and informs. The SNMP agent sends traps or informs to report events to the NMS. The difference between these two types of notification is that informs require acknowledgment but traps do not. Informs are more reliable but are also resource-consuming. Traps are available in SNMPv1, SNMPv2c, and SNMPv3. Informs are available only in SNMPv2c and SNMPv3.

Protocol versions

The device supports SNMPv1, SNMPv2c, and SNMPv3. An NMS and an SNMP agent must use the same SNMP version to communicate with each other.

·     SNMPv1—Uses community names for authentication. To access an SNMP agent, an NMS must use the same community name as set on the SNMP agent. If the community name used by the NMS differs from the community name set on the agent, the NMS cannot establish an SNMP session to access the agent or receive traps from the agent.

·     SNMPv2c—Uses community names for authentication. SNMPv2c is compatible with SNMPv1, but supports more operation types, data types, and error codes.

·     SNMPv3—Uses a user-based security model (USM) to secure SNMP communication. You can configure authentication and privacy mechanisms to authenticate and encrypt SNMP packets for integrity, authenticity, and confidentiality.

Access control modes

SNMP uses the following modes to control access to MIB objects:

·     View-based Access Control Model—VACM mode controls access to MIB objects by assigning MIB views to SNMP communities or users.

·     Role based access control—RBAC mode controls access to MIB objects by assigning user roles to SNMP communities or users.

¡     SNMP communities or users with predefined user role network-admin or level-15 have read and write access to all MIB objects.

¡     SNMP communities or users with predefined user role network-operator have read-only access to all MIB objects.

¡     SNMP communities or users with a user-defined user role have access rights to MIB objects as specified by the rule command.

RBAC mode controls access on a per MIB object basis, and VACM mode controls access on a MIB view basis. As a best practice to enhance MIB security, use the RBAC mode.

If you create the same SNMP community or user with both modes multiple times, the most recent configuration takes effect. For more information about RBAC, see Fundamentals Command Reference.

SNMP silence

SNMP silence enables the device to automatically detect and defend against SNMP attacks.

After you enable SNMP, the device automatically starts an SNMP silence timer and counts the number of packets that fail SNMP authentication within 1 minute.

·     If the number of the packets is smaller than 100, the device restarts the timer and counting.

·     If the number of the packets is equal to or greater than 100, the SNMP module enters a 5-minute silence period, during which the device does not respond to any SNMP packets. After the 5 minutes expire, the device restarts the timer and counting.

SNMP tasks at a glance

To configure SNMP, perform the following tasks:

1.     Enabling the SNMP agent

2.     Enabling SNMP versions

3.     Configuring SNMP basic parameters

¡     (Optional.) Configuring SNMP common parameters

¡     Configuring an SNMPv1 or SNMPv2c community

¡     Configuring an SNMPv3 group and user

4.     (Optional.) Configuring SNMP notifications

5.     (Optional.) Configuring SNMP logging

Enabling the SNMP agent

Restrictions and guidelines

The SNMP agent is enabled when you use any command that begins with snmp-agent except for the snmp-agent calculate-password command.

The SNMP agent will fail to be enabled when the port that the agent will listen on is used by another service. You can use the snmp-agent port command to specify a listening port. To view the UDP port use information, execute the display udp verbose command. For more information about the display udp verbose command, see IP performance optimization commands in Network Connectivity Command Reference.

If you disable the SNMP agent, the SNMP settings do not take effect. The display current-configuration command does not display the SNMP settings. The SNMP settings will not be saved in the configuration file. For the SNMP settings to take effect, enable the SNMP agent.

Procedure

1.     Enter system view.

system-view

2.     Enable the SNMP agent.

snmp-agent

By default, the SNMP agent is disabled.

Enabling SNMP versions

Restrictions and guidelines

The devices supports SNMPv1, SNMPv2c, and SNMPv3. An NMS and an SNMP agent must use the same SNMP version to communicate with each other.

Procedure

1.     Enter system view.

system-view

2.     Enable SNMP versions.

snmp-agent sys-info version { all | { v1 | v2c | v3 } * }

By default, SNMPv3 is enabled.

If you execute the command multiple times with different options, all the configurations take effect, but only one SNMP version is used by the agent and NMS for communication.

Configuring SNMP common parameters

Restrictions and guidelines

An SNMP engine ID uniquely identifies a device in an SNMP managed network. Make sure the local SNMP engine ID is unique within your SNMP managed network to avoid communication problems. By default, the device is assigned a unique SNMP engine ID.

If you have configured SNMPv3 users, change the local SNMP engine ID only when necessary. The change can void the SNMPv3 usernames and encrypted keys you have configured.

The SNMP agent will fail to be enabled when the port that the agent will listen on is used by another service. You can use the snmp-agent port command to change the SNMP listening port. As a best practice, execute the display udp verbose command to view the UDP port use information before specifying a new SNMP listening port. For more information about the display udp verbose command, see IP performance optimization commands in Network Connectivity Command Reference.

Procedure

1.     Enter system view.

system-view

2.     Specify an SNMP listening port.

snmp-agent port port-number

By default, the SNMP listening port is UDP port 161.

3.     Set a local SNMP engine ID.

snmp-agent local-engineid engineid

By default, the local SNMP engine ID is the company ID plus the device ID.

4.     Set an engine ID for a remote SNMP entity.

snmp-agent remote { ipv4-address | ipv6 ipv6-address } engineid engineid

By default, no remote entity engine IDs exist.

This step is required for the device to send SNMPv3 notifications to a host, typically NMS.

5.     Create or update a MIB view.

snmp-agent mib-view { excluded | included } view-name oid-tree [ mask mask-value ]

By default, the MIB view ViewDefault is predefined. In this view, all the MIB objects in the iso subtree but the snmpUsmMIB, snmpVacmMIB, and snmpModules.18 subtrees are accessible.

Each view-name oid-tree pair represents a view record. If you specify the same record with different MIB sub-tree masks multiple times, the most recent configuration takes effect.

6.     Configure the system management information.

¡     Configure the system contact.

snmp-agent sys-info contact sys-contact

By default, the system contact is New H3C Technologies Co., Ltd..

¡     Configure the system location.

snmp-agent sys-info location sys-location

By default, the system location is Hangzhou, China.

7.     Create an SNMP context.

snmp-agent context context-name

By default, no SNMP contexts exist.

8.     Configure the maximum SNMP packet size (in bytes) that the SNMP agent can handle.

snmp-agent packet max-size byte-count

By default, an SNMP agent can process SNMP packets with a maximum size of 1500 bytes.

Configuring an SNMPv1 or SNMPv2c community

About configuring an SNMPv1 or SNMPv2c community

You can create an SNMPv1 or SNMPv2c community by using a community name or by creating an SNMPv1 or SNMPv2c user. After you create an SNMPv1 or SNMPv2c user, the system automatically creates a community by using the username as the community name.

Restrictions and guidelines for configuring an SNMPv1 or SNMPv2c community

SNMPv1 and SNMPv2c settings are not supported in FIPS mode.

Make sure the NMS and agent use the same SNMP community name.

 Only users with the network-admin or level-15 user role can create SNMPv1 or SNMPv2c communities, users, or groups. Users with other user roles cannot create SNMPv1 or SNMPv2c communities, users, or groups even if these roles are granted access to related commands or commands of the SNMPv1 or SNMPv2c feature.

Configuring an SNMPv1/v2c community by a community name

1.     Enter system view.

system-view

2.     Create an SNMPv1/v2c community. Choose one option as needed.

¡     In VACM mode:

snmp-agent community { read | write } [ simple | cipher ] community-name [ mib-view view-name ] [ acl { ipv4-acl-number | name ipv4-acl-name } | acl ipv6 { ipv6-acl-number | name ipv6-acl-name } ] *

¡     In RBAC mode:

snmp-agent community [ simple | cipher ] community-name user-role role-name [ acl { ipv4-acl-number | name ipv4-acl-name } | acl ipv6 { ipv6-acl-number | name ipv6-acl-name } ] *

3.     (Optional.) Map the SNMP community name to an SNMP context.

snmp-agent community-map community-name context context-name

Configuring an SNMPv1/v2c community by creating an SNMPv1/v2c user

1.     Enter system view.

system-view

2.     Create an SNMPv1/v2c group.

snmp-agent group { v1 | v2c } group-name [ read-view view-name ] [ write-view view-name ] [ notify-view view-name ] [ acl { ipv4-acl-number | name ipv4-acl-name } | acl ipv6 { ipv6-acl-number | name ipv6-acl-name } ] *

3.     Add an SNMPv1/v2c user to the group.

snmp-agent usm-user { v1 | v2c } user-name group-name [ acl { ipv4-acl-number | name ipv4-acl-name } | acl ipv6 { ipv6-acl-number | name ipv6-acl-name } ] *

The system automatically creates an SNMP community by using the username as the community name.

4.     (Optional.) Map the SNMP community name to an SNMP context.

snmp-agent community-map community-name context context-name

Configuring an SNMPv3 group and user

Restrictions and guidelines for configuring an SNMPv3 group and user

Only users with the network-admin or level-15 user role can create SNMPv3 users or groups. Users with other user roles cannot create SNMPv3 users or groups even if these roles are granted access to related commands or commands of the SNMPv3 feature.

SNMPv3 users are managed in groups. All SNMPv3 users in a group share the same security model, but can use different authentication and encryption algorithms and keys. Table 1 describes the basic configuration requirements for different security models.

Table 1 Basic configuration requirements for different security models

Security model

Keyword for the group

Parameters for the user

Remarks

Authentication with privacy

privacy

Authentication and encryption algorithms and keys

For an NMS to access the agent, make sure the NMS and agent use the same authentication and encryption keys.

Authentication without privacy

authentication

Authentication algorithm and key

For an NMS to access the agent, make sure the NMS and agent use the same authentication key.

No authentication, no privacy

N/A

N/A

The authentication and encryption keys, if configured, do not take effect.

Configuring an SNMPv3 group and user

1.     Enter system view.

system-view

2.     Create an SNMPv3 group.

snmp-agent group v3 group-name [ authentication | privacy ] [ read-view view-name ] [ write-view view-name ] [ notify-view view-name ] [ acl { ipv4-acl-number | name ipv4-acl-name } | acl ipv6 { ipv6-acl-number | name ipv6-acl-name } ] *

3.     (Optional.) Calculate the encrypted form for the key in plaintext form.

snmp-agent calculate-password plain-password mode { 3desmd5 | 3dessha | md5 | sha } { local-engineid | specified-engineid engineid }

4.     Create an SNMPv3 user. Choose one option as needed.

¡     In VACM mode:

snmp-agent usm-user v3 user-name group-name [ remote { ipv4-address | ipv6 ipv6-address } ] [ { cipher | simple } authentication-mode { md5 | sha } auth-password [ privacy-mode { 3des | aes128 | des56 } priv-password ] ] [ acl { ipv4-acl-number | name ipv4-acl-name } | acl ipv6 { ipv6-acl-number | name ipv6-acl-name } ] *

¡     In RBAC mode:

snmp-agent usm-user v3 user-name user-role role-name [ remote { ipv4-address | ipv6 ipv6-address } ] [ { cipher | simple } authentication-mode { md5 | sha } auth-password [ privacy-mode { 3des | aes128 | des56 } priv-password ] ] [ acl { ipv4-acl-number | name ipv4-acl-name } | acl ipv6 { ipv6-acl-number | name ipv6-acl-name } ] *

To send notifications to an SNMPv3 NMS, you must specify the remote keyword.

If the cipher keyword is specified, the auth-password and priv-password arguments are used as encrypted keys.

5.     (Optional.) Assign a user role to the SNMPv3 user created in RBAC mode.

snmp-agent usm-user v3 user-name user-role role-name

By default, an SNMPv3 user has the user role assigned to it at its creation.

Configuring SNMP notifications

About SNMP notifications

The SNMP agent sends notifications (traps and informs) to inform the NMS of significant events, such as link state changes and user logins or logouts. After you enable notifications for a module, the module sends the generated notifications to the SNMP agent. The SNMP agent sends the received notifications as traps or informs based on the current configuration. Unless otherwise stated, the trap keyword in the command line includes both traps and informs.

Enabling SNMP notifications

Restrictions and guidelines

Enable an SNMP notification only if necessary. SNMP notifications are memory-intensive and might affect device performance.

To generate linkUp or linkDown notifications when the link state of an interface changes, you must perform the following tasks:

·     Enable linkUp or linkDown notification globally by using the snmp-agent trap enable standard [ linkdown | linkup ] * command.

·     Enable linkUp or linkDown notification on the interface by using the enable snmp trap updown command.

After you enable notifications for a module, whether the module generates notifications also depends on the configuration of the module. For more information, see the configuration guide for each module.

Procedure

1.     Enter system view.

system-view

2.     Enable SNMP notifications.

snmp-agent trap enable [ configuration | protocol | standard [ authentication | coldstart | linkdown | linkup | warmstart ] * | system ]

By default, SNMP configuration notifications, standard notifications, and system notifications are enabled. Whether other SNMP notifications are enabled varies by modules.

To enable the device to send SNMP notifications for a protocol, first enable the protocol.

3.     Enter interface view.

interface interface-type interface-number

4.     Enable link state notifications.

enable snmp trap updown

By default, link state notifications are enabled.

Configuring parameters for sending SNMP notifications

About this task

You can configure the SNMP agent to send notifications as traps or informs to a host, typically an NMS, for analysis and management. Traps are less reliable and use fewer resources than informs, because an NMS does not send an acknowledgment when it receives a trap.

When network congestion occurs or the destination is not reachable, the SNMP agent buffers notifications in a queue. You can set the queue size and the notification lifetime (the maximum time that a notification can stay in the queue). A notification is deleted when its lifetime expires. When the notification queue is full, the oldest notifications are automatically deleted.

By default, the device monitors the values of the variables in a trap. When the values reach the specified thresholds, the device enters alarm state and sends a trap to the NMS, The device sends a trap only when it enters alarm state or alarm removed state. The trap retransmission mechanism enables the device to send traps at the specified intervals to notify the NMS as long as the device is in alarm state. Only CPU usage and memory usage traps are supported.

Configuring the parameters for sending SNMP traps

1.     Enter system view.

system-view

2.     Configure a target host.

snmp-agent target-host trap address udp-domain { ipv4-address | ipv6 ipv6-address } [ udp-port port-number ] params securityname security-string [ v1 | v2c | v3 [ authentication | privacy ] ]

By default, no target host is configured.

3.     (Optional.) Configure a source address for sending traps.

snmp-agent trap source interface-type interface-number

By default, SNMP uses the IP address of the outgoing routed interface as the source IP address.

Configuring the parameters for sending SNMP informs

1.     Enter system view.

system-view

2.     Configure a target host.

snmp-agent target-host inform address udp-domain { ipv4-address | ipv6 ipv6-address } [ udp-port port-number ] params securityname security-string { v2c | v3 [ authentication | privacy ] }

By default, no target host is configured.

Only SNMPv2c and SNMPv3 support inform packets.

3.     (Optional.) Configure a source address for sending informs.

snmp-agent inform source interface-type interface-number

By default, SNMP uses the IP address of the outgoing routed interface as the source IP address.

Configuring common parameters for sending notifications

1.     Enter system view.

system-view

2.     (Optional.) Enable extended linkUp/linkDown notifications.

snmp-agent trap if-mib link extended

By default, the SNMP agent sends standard linkUp/linkDown notifications.

You can extend standard linkUp/linkDown notifications to include interface description and interface type, but must make sure the NMS supports the extended SNMP messages. If the NMS does not support extended linkUp/linkDown notifications, do not use this command.

3.     (Optional.) Set the notification queue size.

snmp-agent trap queue-size size

By default, the notification queue can hold 100 notification messages.

4.     (Optional.) Set the notification lifetime.

snmp-agent trap life seconds

The default notification lifetime is 120 seconds.

Configuring SNMP logging

About this task

The SNMP agent logs Get requests, Set requests, Set responses, SNMP notifications, and SNMP authentication failures, but does not log Get responses.

·     Get operation—The agent logs the IP address of the NMS, name of the accessed node, and node OID.

·     Set operation—The agent logs the NMS' IP address, name of accessed node, node OID, variable value, and error code and index for the Set operation.

·     Notification tracking—The agent logs the SNMP notifications after sending them to the NMS.

·     SNMP authentication failure—The agent logs related information when an NMS fails to be authenticated by the agent.

The SNMP module sends these logs to the information center. You can configure the information center to output these messages to certain destinations, such as the console and the log buffer. The total output size for the node field (MIB node name) and the value field (value of the MIB node) in each log entry is 1024 bytes. If this limit is exceeded, the information center truncates the data in the fields. For more information about the information center, see System Management Configuration Guide.

Restrictions and guidelines

Enable SNMP logging only if necessary. SNMP logging is memory-intensive and might impact device performance.

Procedure

1.     Enter system view.

system-view

2.     Enable SNMP logging.

snmp-agent log { all | authfail | get-operation | set-operation }

By default, SNMP logging is disabled.

3.     Enable SNMP notification logging.

snmp-agent trap log

By default, SNMP notification logging is disabled.

Display and maintenance commands for SNMP

Execute display commands in any view.

 

Task

Command

Display SNMPv1 or SNMPv2c community information.

display snmp-agent community [ read | write ]

Display SNMP contexts.

display snmp-agent context [ context-name ]

Display SNMP group information.

display snmp-agent group [ group-name ]

Display the local engine ID.

display snmp-agent local-engineid

Display SNMP MIB node information.

display snmp-agent mib-node [ details | index-node | trap-node | verbose ]

Display MIB view information.

display snmp-agent mib-view [ exclude | include | viewname view-name ]

Display remote engine IDs.

display snmp-agent remote [ { ipv4-address | ipv6 ipv6-address } ]

Display SNMP agent statistics.

display snmp-agent statistics

Display SNMP agent system information.

display snmp-agent sys-info [ contact | location | version ] *

Display basic information about the notification queue.

display snmp-agent trap queue

Display SNMP notifications enabling status for modules.

display snmp-agent trap-list

Display SNMPv3 user information.

display snmp-agent usm-user [ engineid engineid | username user-name | group group-name ] *

 

SNMP configuration examples

Example: Configuring SNMPv1/SNMPv2c

The configuration procedure is the same for SNMPv1 and SNMPv2c. The following example configures SNMPv1.

Network configuration

As shown in Figure 3, configure SNMPv1 on the NMS (1.1.1.2/24) and agent (1.1.1.1/24) so that the NMS can monitor and manage the agent and the agent automatically sends notifications to report events to the NMS.

Figure 3 Network diagram

Procedure

IMPORTANT

IMPORTANT:

For the NMS to monitor, configure, and receive notifications from the agent, make sure the agent and the NMS have the same settings.

1.     Configure the agent:

# Assign IP address 1.1.1.1/24 to the agent and make sure the agent and the NMS are reachable to each other. (Details not shown.)

# Specify SNMPv1, and create read-only community public and read and write community private.

<Agent> system-view

[Agent] snmp-agent sys-info version v1

[Agent] snmp-agent community read public

[Agent] snmp-agent community write private

# Configure contact and physical location information for the agent.

[Agent] snmp-agent sys-info contact Mr.Wang-Tel:3306

[Agent] snmp-agent sys-info location telephone-closet,3rd-floor

# Enable the agent to use SNMPv1 community name public to send SNMP notifications to the NMS at 1.1.1.2.

[Agent] snmp-agent trap enable

[Agent] snmp-agent target-host trap address udp-domain 1.1.1.2 params securityname public v1

2.     Configure the NMS:

¡     Specify SNMPv1.

¡     Create read-only community public and read and write community private.

¡     Set the timeout timer and maximum number of retries as needed.

For information about configuring the NMS, see the NMS manual.

Verifying the configuration

# Try to get the MTU value of NULL0 interface on the agent. The attempt succeeds.

Send request to 1.1.1.1/161 ...

Protocol version: SNMPv1

Operation: Get

Request binding:

1: 1.3.6.1.2.1.2.2.1.4.135471

Response binding:

1: Oid=ifMtu.135471 Syntax=INT Value=1500

Get finished

# Use an incorrect community name to get the value of a MIB node on the agent. An authentication failure trap is sent to the NMS.

1.1.1.1/2934 V1 Trap = authenticationFailure

SNMP Version = V1

Community = public

Command = Trap

Enterprise = 1.3.6.1.4.1.43.1.16.4.3.50

GenericID = 4

SpecificID = 0

Time Stamp = 8:35:25.68

Example: Configuring SNMPv3

Network configuration

As shown in Figure 4, perform the following tasks:

·     Configure SNMPv3 on the NMS (1.1.1.2/24) and the agent (1.1.1.1/24) so that the NMS can monitor and manage the agent and the agent automatically sends notifications to report events to the NMS.

·     Configure SNMP authentication and encryption on the NMS and agent. Set the authentication algorithm to SHA-1 and the authentication key to 123456TESTauth&!, the encryption algorithm to AES algorithm and the encryption key to 123456TESTencr&!.

Figure 4 Network diagram

Configuring SNMPv3 in RBAC mode

IMPORTANT

IMPORTANT:

For the NMS to monitor, configure, and receive notifications from the agent, make sure the agent and the NMS have the same settings.

1.     Configure the agent:

# Assign IP address 1.1.1.1/24 to the agent and make sure the agent and the NMS are reachable to each other. (Details not shown.)

# Create user role test, and assign test read-only access to the objects under the snmpMIB subtree (OID: 1.3.6.1.6.3.1), including the linkUp and linkDown objects.

<Agent> system-view

[Agent] role name test

[Agent-role-test] rule 1 permit read oid 1.3.6.1.6.3.1

# Assign user role test read-only access to the system subtree (OID: 1.3.6.1.2.1.1) and read-write access to the interfaces subtree (OID: 1.3.6.1.2.1.2).

[Agent-role-test] rule 2 permit read oid 1.3.6.1.2.1.1

[Agent-role-test] rule 3 permit read write oid 1.3.6.1.2.1.2

[Agent-role-test] quit

# Create SNMPv3 user RBACtest. Assign user role test to RBACtest. Set the authentication algorithm to sha, authentication key to 123456TESTauth&!, encryption algorithm to aes128, and encryption key to 123456TESTencr&!.

[Agent] snmp-agent usm-user v3 RBACtest user-role test simple authentication-mode sha 123456TESTauth&! privacy-mode aes128 123456TESTencr&!

# Configure contact and physical location information for the agent.

[Agent] snmp-agent sys-info contact Mr.Wang-Tel:3306

[Agent] snmp-agent sys-info location telephone-closet,3rd-floor

# Enable the agent to use SNMPv3 username RBACtest to send SNMP notifications to the NMS at 1.1.1.2.

[Agent] snmp-agent trap enable

[Agent] snmp-agent target-host trap address udp-domain 1.1.1.2 params securityname RBACtest v3 privacy

2.     Configure the NMS:

¡     Specify SNMPv3.

¡     Create SNMPv3 user RBACtest.

¡     Enable SNMP authentication and encryption. Set the authentication algorithm to SHA-1, authentication key to 123456TESTauth&!, encryption algorithm to AES, and encryption key to 123456TESTencr&!.

¡     Set the timeout timer and maximum number of retries.

For information about configuring the NMS, see the NMS manual.

Configuring SNMPv3 in VACM mode

IMPORTANT

IMPORTANT:

For the NMS to monitor, configure, and receive notifications from the agent, make sure the agent and the NMS have the same settings.

 

1.     Configure the agent:

# Assign IP address 1.1.1.1/24 to the agent, and make sure the agent and the NMS are reachable to each other. (Details not shown.)

# Create MIB view test and include subtree snmpMIB in the view. Create SNMPv3 group managev3group and assign managev3group read-write access to objects in the test view, including the linkUp and linkDown objects.

<Agent> system-view

[Agent] undo snmp-agent mib-view ViewDefault

[Agent] snmp-agent mib-view included test snmpMIB

[Agent] snmp-agent group v3 managev3group privacy read-view test

# Assign SNMPv3 group managev3group read-write access to the objects under the system subtree (OID: 1.3.6.1.2.1.1) and interfaces subtree (OID:1.3.6.1.2.1.2) in the test view.

[Agent] snmp-agent mib-view included test 1.3.6.1.2.1.1

[Agent] snmp-agent mib-view included test 1.3.6.1.2.1.2

[Agent] snmp-agent group v3 managev3group privacy read-view test write-view test

# Add user VACMtest to SNMPv3 group managev3group, and set the authentication algorithm to sha, authentication key to 123456TESTauth&!, encryption algorithm to aes128, and encryption key to 123456TESTencr&!.

[Agent] snmp-agent usm-user v3 VACMtest managev3group simple authentication-mode sha 123456TESTauth&! privacy-mode aes128 123456TESTencr&!

# Configure contact and physical location information for the agent.

[Agent] snmp-agent sys-info contact Mr.Wang-Tel:3306

[Agent] snmp-agent sys-info location telephone-closet,3rd-floor

# Enable the agent to use SNMPv3 username VACMtest to send SNMP notifications to the NMS at 1.1.1.2.

[Agent] snmp-agent trap enable

[Agent] snmp-agent target-host trap address udp-domain 1.1.1.2 params securityname VACMtest v3 privacy

2.     Configure the NMS:

¡     Specify SNMPv3.

¡     Create SNMPv3 user VACMtest.

¡     Enable SNMP authentication and encryption. Set the authentication algorithm to SHA-1, authentication key to 123456TESTauth&!, encryption algorithm to AES, and encryption key to 123456TESTencr&!.

¡     Set the timeout timer and maximum number of retries.

For information about configuring the NMS, see the NMS manual.

Verifying the configuration

·     Use username RBACtest to access the agent.

# Retrieve the value of the sysName node. The value Agent is returned.

# Set the value for the sysName node to Sysname. The operation fails because the NMS does not have write access to the node.

# Shut down or bring up an interface on the agent. The NMS receives linkUP (OID: 1.3.6.1.6.3.1.1.5.4) or linkDown (OID: 1.3.6.1.6.3.1.1.5.3) notifications.

·     Use username VACMtest to access the agent.

# Retrieve the value of the sysName node. The value Agent is returned.

# Set the value for the sysName node to Sysname. The operation succeeds.

# Shut down or bring up an interface on the agent. The NMS receives linkUP (OID: 1.3.6.1.6.3.1.1.5.4) or linkDown (OID: 1.3.6.1.6.3.1.1.5.3) notifications.