11-Network Management and Monitoring Configuration Guide

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04-SNMP configuration
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Configuring SNMP

This chapter provides an overview of the Simple Network Management Protocol (SNMP) and guides you through the configuration procedure.

Overview

SNMP is an Internet standard protocol widely 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.

FIPS compliance

The device supports the FIPS mode that complies with NIST FIPS 140-2 requirements. Support for features, commands, and parameters might differ in FIPS mode and non-FIPS mode. For more information about FIPS mode, see Security Configuration Guide.

SNMP framework

The SNMP framework comprises 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 SNMP object nodes in an agent MIB.

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

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

Protocol versions

SNMPv1, SNMPv2c, and SNMPv3 are supported in non-FIPS mode. Only SNMPv3 is supported in FIPS mode. 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.

¡  An SNMP community or user with a predefined user role network-admin or level-15 has read and write access to all MIB objects.

¡  An SNMP community or user with a predefined user role network-operator has read-only access to all MIB objects.

¡  An SNMP community or user with a user role specified by the role command accesses MIB objects through the user role rules specified by the rule command.

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

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 RBAC mode.

Configuring SNMP basic parameters

SNMPv3 differs from SNMPv1 and SNMPv2c in many ways. Their configuration procedures are described in separate sections.

Configuring SNMPv1 or SNMPv2c basic parameters

SNMPv1 and SNMPv2c settings are supported only in non-FIPS mode.

To configure SNMPv1 or SNMPv2c basic parameters:

 

Step

Command

Remarks

1.       Enter system view.

system-view

N/A

2.       (Optional.) Enable the SNMP agent.

snmp-agent

By default, the SNMP agent is disabled.

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

3.       (Optional.) Configure the system contact.

snmp-agent sys-info contact sys-contact

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

4.       (Optional.) Configure the system location.

snmp-agent sys-info location sys-location

By default, the system location is Hangzhou, China.

5.       Enable SNMPv1 or SNMPv2c.

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

The default is SNMPv3.

6.       (Optional.) Change the local engine ID.

snmp-agent local-engineid engineid

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

7.       (Optional.) 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. Except for the four sub-trees in the default MIB view, you can create up to 16 unique MIB view records.

8.       Configure the SNMP access right.

·         (Method 1.) Create an SNMP community:
In VACM mode:
snmp-agent community { read | write } [ simple | cipher ] community-name [ mib-view view-name ] [ acl acl-number | acl ipv6 ipv6-acl-number ] *

In RBAC mode:
snmp-agent community [ simple | cipher ] community-name user-role role-name [ acl acl-number | acl ipv6 ipv6-acl-number ] *

·         (Method 2.) Create an SNMPv1/v2c group, and add users to the group:

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

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

By default, no SNMP group or SNMP community exists.

The username configured by using method 1 is the same as that configured by using method 2. Usernames created by either method must be the same as the community name configured on the NMS.

9.       (Optional.) Create an SNMP context.

snmp-agent context context-name

By default, no SNMP context is configured on the device.

10.     (Optional.) Map an SNMP community to an SNMP context.

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

By default, no mapping between an SNMP community and an SNMP context exists on the device.

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

snmp-agent packet max-size byte-count

By default, the maximum SNMP packet size that the SNMP agent can handle is 1500 bytes.

12.     (Optional.) Specify the UDP port for receiving SNMP packets.

snmp-agent port port-number

By default, the device uses UDP port 161 for receiving SNMP packets.

 

Configuring SNMPv3 basic parameters

SNMPv3 users are managed in groups. All SNMPv3 users in a group share the same security model, but can use different authentication and privacy key settings. To implement a security model for a user and avoid SNMP communication failures, make sure the security model configuration for the group and the security key settings for the user are compliant with Table 1 and match the settings on the NMS.

Table 1 Basic security setting requirements for different security models

Security model

Security model keyword for the group

Security key settings for the user

Remarks

Authentication with privacy

privacy

Authentication key, privacy key

If the authentication key or the privacy key is not configured, SNMP communication will fail.

Authentication without privacy

authentication

Authentication key

If no authentication key is configured, SNMP communication will fail.

The privacy key (if any) for the user does not take effect.

No authentication, no privacy

Neither authentication nor privacy

None

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

 

To configure SNMPv3 basic parameters:

 

Step

Command

Remarks

1.       Enter system view.

system-view

N/A

2.       (Optional.) Enable the SNMP agent.

snmp-agent

By default, the SNMP agent is disabled.

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

3.       (Optional.) Configure the system contact.

snmp-agent sys-info contact sys-contact

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

4.       (Optional.) Configure the system location.

snmp-agent sys-info location sys-location

By default, the system location is Hangzhou, China.

5.       Enable SNMPv3.

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

The default is SNMPv3.

6.       (Optional.) Change the local engine ID.

snmp-agent local-engineid engineid

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

IMPORTANT IMPORTANT:

After you change the local engine ID, the existing SNMPv3 users and encrypted form keys become invalid, and you must reconfigure them.

7.       (Optional.) Configure a remote engine ID.

snmp-agent remote { ip-address | ipv6 ipv6-address } [ vpn-instance vpn-instance-name ] engineid engineid

By default, no remote engine ID is configured.

To send informs to an SNMPv3 NMS, you must configure the SNMP engine ID of the NMS.

8.       (Optional.) 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. Except for the four sub-trees in the default MIB view, you can create up to 16 unique MIB view records.

9.       Create an SNMPv3 group.

·         In non-FIPS mode:
snmp-agent
group v3 group-name [ authentication | privacy ] [ read-view view-name ] [ write-view view-name ] [ notify-view view-name ] [ acl acl-number | acl ipv6 ipv6-acl-number ] *

·         In FIPS mode:
snmp-agent group v3 group-name { authentication | privacy } [ read-view read-view ] [ write-view write-view ] [ notify-view notify-view ] [ acl acl-number | acl ipv6 ipv6-acl-number ] *

By default, no SNMP group exists.

10.     (Optional.) Create an SNMP context.

snmp-agent context context-name

By default, no SNMP context is configured on the device.

11.     (Optional.) Calculate a digest for the encrypted form key converted from a plaintext form key.

·         In non-FIPS mode:
snmp-agent calculate-password
plain-password mode { 3desmd5 | 3dessha | md5 | sha } { local-engineid | specified-engineid engineid }

·         In FIPS mode:
snmp-agent calculate-password plain-password mode sha { local-engineid | specified-engineid engineid }

N/A

12.     Create an SNMPv3 user.

·         In non-FIPS mode (in VACM mode):
snmp-agent
usm-user v3 user-name group-name [ remote { ip-address | ipv6 ipv6-address } [ vpn-instance vpn-instance-name ]
] [ { cipher | simple } authentication-mode { md5 | sha } auth-password [ privacy-mode { aes128 | 3des | des56 } priv-password ] ] [ acl acl-number | acl ipv6 ipv6-acl-number ] *

·         In non-FIPS mode (in RBAC mode):
snmp-agent usm-user v3 user-name user-role role-name [ remote { ip-address | ipv6 ipv6-address } [ vpn-instance vpn-instance-name ] ] [ { cipher | simple } authentication-mode { md5 | sha } auth-password [ privacy-mode { aes128 | 3des | des56 } priv-password ] ] [ acl acl-number | acl ipv6 ipv6-acl-number ] *

·         In FIPS mode (in VACM mode):
snmp-agent usm-user v3 user-name group-name [ remote { ip-address | ipv6 ipv6-address } [ vpn-instance vpn-instance-name ]
] { cipher | simple } authentication-mode sha auth-password [ privacy-mode aes128 priv-password ] [ acl acl-number | acl ipv6 ipv6-acl-number ] *

·         In FIPS mode (in RBAC mode):
snmp-agent usm-user v3 user-name user-role role-name [ remote { ip-address | ipv6 ipv6-address } [ vpn-instance vpn-instance-name ] ] { cipher | simple } authentication-mode sha auth-password [ privacy-mode aes128 priv-password ] [ acl acl-number | acl ipv6 ipv6-acl-number ] *

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

To send informs to an SNMPv3 NMS, you must configure the remote keyword to specify the IP address of the NMS.

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

snmp-agent packet max-size byte-count

By default, the maximum SNMP packet size that the SNMP agent can handle is 1500 bytes.

14.     (Optional.) Specify the UDP port for receiving SNMP packets.

snmp-agent port port-number

By default, the device uses UDP port 161 for receiving SNMP packets.

 

Configuring SNMP logging

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

The SNMP agent logs Get requests, Set requests, Set responses, and SNMP notifications, 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.

To configure SNMP logging:

 

Step

Command

Remarks

1.       Enter system view.

system-view

N/A

2.       (Optional.) Enable SNMP logging.

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

By default, SNMP logging is disabled.

3.       (Optional.) Enable SNMP notification logging.

snmp-agent trap log

By default, SNMP notification logging is disabled.

 

Configuring 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. Unless otherwise stated, the trap keyword in the command line includes both traps and informs.

Enabling SNMP notifications

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

To enable SNMP notifications:

 

Step

Command

Remarks

1.       Enter system view.

system-view

N/A

2.       Enable notifications globally.

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 with modules.

3.       Enter interface view.

interface interface-type interface-number

N/A

4.       Enable link state notifications.

enable snmp trap updown

By default, link state notifications are enabled.

 

Configuring the SNMP agent to send notifications to a host

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 acknowledgement when it receives a trap.

Configuration guidelines

When network congestion occurs or the destination is not reachable, the SNMP agent buffers notifications in a queue. You can configure 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.

You can extend standard linkUp/linkDown notifications to include interface description and interface type, but must make sure that the NMS supports the extended SNMP messages.

To send informs, make sure:

·          The SNMP agent and the NMS use SNMPv2c or SNMPv3.

·          If SNMPv3 is used, you must configure the SNMP engine ID of the NMS when you configure SNMPv3 basic settings. Also, specify the IP address of the SNMP engine when you create the SNMPv3 user.

Configuration prerequisites

·          Configure the SNMP agent with the same basic SNMP settings as the NMS. If SNMPv1 or SNMPv2c is used, you must configure a community name. If SNMPv3 is used, you must configure an SNMPv3 user, a MIB view, and a remote SNMP engine ID associated with the SNMPv3 user for notifications.

·          The SNMP agent and the NMS can reach each other.

Configuration procedure

To configure the SNMP agent to send notifications to a host:

 

Step

Command

Remarks

1.       Enter system view.

system-view

N/A

2.       Configure a target host.

·         (Method 1.) Send traps to the target host:
In non-FIPS mode:
snmp-agent target-host trap address udp-domain { target-host | ipv6 target-host } [ udp-port port-number ] [ vpn-instance vpn-instance-name ]
params securityname security-string [ v1 | v2c | v3 [ authentication | privacy ] ]
In FIPS mode:
snmp-agent target-host trap address udp-domain { target-host | ipv6 target-host } [ udp-port port-number ] [ vpn-instance vpn-instance-name ]
params securityname security-string v3 { authentication | privacy }

·         (Method 2.) Send informs to the target host:
In non-FIPS mode:
snmp-agent target-host inform address udp-domain { target-host | ipv6 target-host } [ udp-port port-number ] [ vpn-instance vpn-instance-name ]
params securityname security-string { v2c | v3 [ authentication | privacy ] }
In FIPS mode:
snmp-agent target-host inform address udp-domain { target-host | ipv6 target-host } [ udp-port port-number ] [ vpn-instance vpn-instance-name ]
params securityname security-string v3 { authentication | privacy }

By default, no target host is configured.

3.       (Optional.) Configure a source address for notifications.

snmp-agent { inform | trap } source interface-type { interface-number | interface-number.subnumber }

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

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

snmp-agent trap if-mib link extended

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

5.       (Optional.) Configure the notification queue size.

snmp-agent trap queue-size size

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

6.       (Optional.) Configure the notification lifetime.

snmp-agent trap life seconds

The default notification lifetime is 120 seconds.

 

Displaying the SNMP settings

Execute display commands in any view. The display snmp-agent community command is supported only in non-FIPS mode.

 

Task

Command

Display SNMP agent system information, including the contact, physical location, and SNMP version.

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

Display SNMP agent statistics.

display snmp-agent statistics

Display the local engine ID.

display snmp-agent local-engineid

Display SNMP group information.

display snmp-agent group [ group-name ]

Display remote engine IDs.

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

Display basic information about the notification queue.

display snmp-agent trap queue

Display the modules that can generate notifications and their notification status (enable or disable).

display snmp-agent trap-list

Display SNMPv3 user information.

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

Display SNMPv1 or SNMPv2c community information.

display snmp-agent community [ read | write ]

Display MIB view information.

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

Display SNMP MIB node information.

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

Display an SNMP context.

display snmp-agent context [ context-name ]

 

SNMP configuration examples

SNMPv1/SNMPv2c configuration example

SNMPv1 configuration procedure is the same as the SNMPv2c configuration procedure. This example uses SNMPv1, and is available only for non-FIPS mode.

Network requirements

As shown in Figure 3, the NMS (1.1.1.2/24) uses SNMPv1 to manage the SNMP agent (1.1.1.1/24), and the agent automatically sends notifications to report events to the NMS.

Figure 3 Network diagram

 

Configuration procedure

1.        Configure the SNMP agent:

# Configure the IP address of the agent and make sure the agent and the NMS can reach each other. (Details not shown.)

# Specify SNMPv1, and create the read-only community public and the 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 SNMP notifications, set the NMS at 1.1.1.2 as an SNMP trap destination, and use public as the community name. (To make sure the NMS can receive traps, specify the same SNMP version in the snmp-agent target-host command as is configured on the NMS.)

[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 SNMP NMS:

¡  Specify SNMPv1.

¡  Create the read-only community public, and create the 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.

 

 

NOTE:

The SNMP settings on the agent and the NMS must match.

 

3.        Verify the configuration:

# Try to get the MTU value of NULL0 interface from 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 a wrong community name to get the value of a MIB node on the agent. You can see an authentication failure trap on 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

SNMPv3 in VACM mode configuration example

Network requirements

As shown in Figure 4, the NMS (1.1.1.2/24) uses SNMPv3 to monitor and manage the interface status of the agent (1.1.1.1/24). The agent automatically sends notifications to report events to the NMS. The default UDP port 162 is used for SNMP notifications.

The NMS and the agent perform authentication when they set up an SNMP session. The authentication algorithm is SHA-1 and the authentication key is 123456TESTauth&!. The NMS and the agent also encrypt the SNMP packets between them by using the AES algorithm and the privacy key 123456TESTencr&!.

Figure 4 Network diagram

 

Configuration procedure

1.        Configure the agent:

# Configure the IP address of the agent, and make sure the agent and the NMS can reach each other. (Details not shown.)

# Assign the NMS (SNMPv3 group managev3group) read and write access to the objects under the snmp node (OID 1.3.6.1.2.1.11), and deny its access to any other MIB object.

<Agent> system-view

[Agent] undo snmp-agent mib-view ViewDefault

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

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

# Add the user managev3user to the SNMPv3 group managev3group, and set the authentication algorithm to sha, authentication key to 123456TESTauth&!, encryption algorithm to aes128, and privacy key to 123456TESTencr&!.

[Agent] snmp-agent usm-user v3 managev3user 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 notifications, specify the NMS at 1.1.1.2 as a trap destination, and set the username to managev3user for the traps.

[Agent] snmp-agent trap enable

[Agent] snmp-agent target-host trap address udp-domain 1.1.1.2 params securityname managev3user v3 privacy

2.        Configure the SNMP NMS:

¡  Specify SNMPv3.

¡  Create the SNMPv3 user managev3user.

¡  Enable both authentication and privacy functions.

¡  Use SHA-1 for authentication and AES for encryption.

¡  Set the authentication key to 123456TESTauth&! and the privacy key to 123456TESTencr&!.

¡  Set the timeout timer and maximum number of retries.

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

 

 

NOTE:

The SNMP settings on the agent and the NMS must match.

 

3.        Verify the configuration:

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

Send request to 1.1.1.1/161 ...

Protocol version: SNMPv3

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

# Try to get the device name from the agent. The get attempt fails because the NMS has no access right to the node.

Send request to 1.1.1.1/161 ...

Protocol version: SNMPv3

Operation: Get

Request binding:

1: 1.3.6.1.2.1.1.5.0

Response binding:

1: Oid=sysName.0 Syntax=noSuchObject Value=NULL

Get finished

# Execute the shutdown or undo shutdown command on an idle interface on the agent. You can see the link state change traps on the NMS:

1.1.1.1/3374 V3 Trap = linkdown

SNMP Version = V3

Community = managev3user

Command = Trap

1.1.1.1/3374 V3 Trap = linkup

SNMP Version = V3

Community = managev3user

Command = Trap

SNMPv3 in RBAC mode configuration example

Network requirements

As shown in Figure 5, the NMS (1.1.1.2/24) uses SNMPv3 to monitor and manage the interface status of the agent (1.1.1.1/24). The agent automatically sends notifications to report events to the NMS.

The NMS and the agent perform authentication when they establish an SNMP session. The authentication algorithm is SHA-1 and the authentication key is 123456TESTauth&!. The NMS and the agent also encrypt the SNMP packets between them by using the AES algorithm and the privacy key 123456TESTencr&!.

Figure 5 Network diagram

 

Configuration procedure

1.        Configure the agent:

# Configure the IP address of the agent, and make sure the agent and the NMS can reach each other. (Details not shown.)

# Create the user role test, and permit test to have read and write access to the snmp node (OID 1.3.6.1.2.1.11).

<Agent> system-view

[Agent] role name test

[Agent-role-test] rule 1 permit read write oid 1.3.6.1.2.1.11

# Permit the user role test to have read-only access to the system node (OID 1.3.6.1.2.1.1) and hh3cUIMgt node (OID 1.3.6.1.4.1.25506.2.2).

[Agent-role-test] rule 2 permit read oid 1.3.6.1.4.1.25506.2.2

[Agent-role-test] rule 3 permit read oid 1.3.6.1.2.1.1

[Agent-role-test] quit

# Create the SNMPv3 user managev3user with the user role test, and enable the authentication with privacy security model for the user. Set the authentication algorithm to sha, authentication key to 123456TESTauth&!, encryption algorithm to aes128, and privacy key to 123456TESTencr&!.

[Agent] snmp-agent usm-user v3 managev3user 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 notifications, specify the NMS at 1.1.1.2 as a notification destination, and set the username to managev3user for the notifications.

[Agent] snmp-agent trap enable

[Agent] snmp-agent target-host trap address udp-domain 1.1.1.2 params securityname managev3user v3 privacy

2.        Configure the SNMP NMS:

¡  Specify SNMPv3.

¡  Create the SNMPv3 user managev3user.

¡  Enable both authentication and privacy functions.

¡  Use SHA-1 for authentication and AES for encryption.

¡  Set the authentication key to 123456TESTauth&! and the privacy key to 123456TESTencr&!.

¡  Set the timeout timer and maximum number of retries.

For information about how to configure the NMS, see the NMS manual.

 

 

NOTE:

The SNMP settings on the agent and the NMS must match.

 

3.        Verify the configuration:

# Try to get the value of sysName from the agent. The get attempt succeeds.

Send request to 1.1.1.1/161 ...

Protocol version: SNMPv3

Operation: Get

Request binding:

1: 1.3.6.1.2.1.1.5.0

Response binding:

1: Oid=sysName.0 Syntax=OCTETS Value=Agent

Get finished

# Try to set the device name from the agent. The set attempt fails because the NMS does not have access rights to the node.

Send request to 1.1.1.1/161 ...

Protocol version: SNMPv3

Operation: Set

Request binding:

1: 1.3.6.1.2.1.1.5.0

Response binding:

Session failed ! SNMP: Cannot access variable, No Access, error index=11: Oid=sysName.0 Syntax=OCTETS Value=h3c Set finished

%Aug 14 16:13:21:475 2013 Agent SNMP/5/SNMP_SETDENY: -IPAddr=1.1.1.2-SecurityName=managev3user-SecurityModel=SNMPv3-OP=SET-Node=sysName(1.3.6.1.2.1.1.5.0)-Value=h3c; Permission denied.

# Log in to the agent. You can see a notification on the NMS.

hh3cLogIn inform received from: 192.168.41.41 at 2013/8/14 17:36:16

  Time stamp: 0 days 08h:03m:43s.37th

  Agent address: 1.1.1.1 Port: 62861 Transport: IP/UDP Protocol: SNMPv2c Inform

  Manager address: 1.1.1.2 Port: 10005 Transport: IP/UDP

  Community: public

  Bindings (4)

    Binding #1: sysUpTime.0 *** (timeticks) 0 days 08h:03m:43s.37th

    Binding #2: snmpTrapOID.0 *** (oid) hh3cLogIn

    Binding #3: hh3cTerminalUserName.0 *** (octets) testuser [74.65.73.74.75.73.65.72 hex)]

    Binding #4: hh3cTerminalSource.0 *** (octets) VTY [56.54.59 (hex)]

 

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