Table Of Contents
Configuring SNMP
Information About SNMP
SNMP Functional Overview
SNMP Notifications
SNMPv3
Security Models and Levels for SNMPv1, v2, v3
User-Based Security Model
CLI and SNMP User Synchronization
Group-Based SNMP Access
SNMP and Embedded Event Manager
Multiple Instance Support
High Availability
Virtualization Support
Licensing Requirements for SNMP
Prerequisites for SNMP
Guidelines and Limitations
Default Settings
Configuring SNMP
Configuring SNMP Users
Enforcing SNMP Message Encryption
Assigning SNMPv3 Users to Multiple Roles
Creating SNMP Communities
Filtering SNMP Requests
Configuring SNMP Notification Receivers
Configuring a Source Interface for SNMP Notifications
Configuring the Notification Target User
Configuring SNMP Notification Receivers with VRFs
Configuring SNMP to Send Traps Using an Inband Port
Enabling SNMP Notifications
Disabling LinkUp/LinkDown Notifications on an Interface
Displaying SNMP ifIndex for an Interface
Enabling a One-time Authentication for SNMP over TCP
Assigning the SNMP Device Contact and Location Information
Configuring the Context to Network Entity Mapping
Disabling SNMP
Modifying the AAA Synchronization Time
Verifying the SNMP Configuration
Configuration Examples for SNMP
Additional References
Related Documents
Standards
MIBs
Feature History for SNMP
Configuring SNMP
This chapter describes how to configure the SNMP feature on Cisco NX-OS devices.
This chapter includes the following sections:
•
Information About SNMP
•Licensing Requirements for SNMP
•Prerequisites for SNMP
•Guidelines and Limitations
•Default Settings
•Configuring SNMP
•Verifying the SNMP Configuration
•Configuration Examples for SNMP
•Additional References
•Feature History for SNMP
Information About SNMP
The Simple Network Management Protocol (SNMP) is an application-layer protocol that provides a message format for communication between SNMP managers and agents. SNMP provides a standardized framework and a common language used for the monitoring and management of devices in a network.
This section includes the following topics:
•SNMP Functional Overview
•SNMP Notifications
•SNMPv3
•SNMP and Embedded Event Manager
•Multiple Instance Support
•High Availability
•Virtualization Support
SNMP Functional Overview
The SNMP framework consists of three parts:
•An SNMP manager—The system used to control and monitor the activities of network devices using SNMP.
•An SNMP agent—The software component within the managed device that maintains the data for the device and reports these data, as needed, to managing systems. Cisco NX-OS supports the agent and MIB. To enable the SNMP agent, you must define the relationship between the manager and the agent.
•A managed information base (MIB)—The collection of managed objects on the SNMP agent.
SNMP is defined in RFCs 3411 to 3418.
Cisco NX-OS supports SNMPv1, SNMPv2c, and SNMPv3. Both SNMPv1 and SNMPv2c use a community-based form of security.
Cisco NX-OS supports SNMP over IPv6.
SNMP Notifications
A key feature of SNMP is the ability to generate notifications from an SNMP agent. These notifications do not require that requests be sent from the SNMP manager. Notifications can indicate improper user authentication, restarts, the closing of a connection, loss of a connection to a neighbor router, or other significant events.
Cisco NX-OS generates SNMP notifications as either traps or informs. A trap is an asynchronous, unacknowledged message sent from the agent to the SNMP managers listed in the host receiver table (see the "Configuring SNMP Notification Receivers with VRFs" section). Informs are asynchronous messages sent from the SNMP agent to the SNMP manager which the manager must acknowledge receipt of.
Traps are less reliable than informs because the SNMP manager does not send any acknowledgment when it receives a trap. Cisco NX-OS cannot determine if the trap was received. An SNMP manager that receives an inform request acknowledges the message with an SNMP response protocol data unit (PDU). If Cisco NX-OS never receives a response, it can send the inform request again.
You can configure Cisco NX-OS to send notifications to multiple host receivers. See the "Configuring SNMP Notification Receivers" section for more information about host receivers.
Table 11-1 lists the SNMP traps that are enabled by default.
Table 11-1 SNMP Traps Enabled By Default
Trap Type
|
Description
|
generic
|
: coldStart
|
generic
|
: warmStart
|
entity
|
: entity_mib_change
|
entity
|
: entity_module_status_change
|
entity
|
: entity_power_status_change
|
entity
|
: entity_module_inserted
|
entity
|
: entity_module_removed
|
entity
|
: entity_unrecognised_module
|
entity
|
: entity_fan_status_change
|
entity
|
: entity_power_out_change
|
link
|
: linkDown
|
link
|
: linkUp
|
link
|
: extended-linkDown
|
link
|
: extended-linkUp
|
link
|
: cieLinkDown
|
link
|
: cieLinkUp
|
link
|
: delayed-link-state-change
|
rf
|
: redundancy_framework
|
license
|
: notify-license-expiry
|
license
|
: notify-no-license-for-feature
|
license
|
: notify-licensefile-missing
|
license
|
: notify-license-expiry-warning
|
upgrade
|
: UpgradeOpNotifyOnCompletion
|
upgrade
|
: UpgradeJobStatusNotify
|
rmon
|
: risingAlarm
|
rmon
|
: fallingAlarm
|
rmon
|
: hcRisingAlarm
|
rmon
|
: hcFallingAlarm
|
entity
|
: entity_sensor
|
SNMPv3
SNMPv3 provides secure access to devices by a combination of authenticating and encrypting frames over the network. The security features provided in SNMPv3 are as follows:
•Message integrity—Ensures that a packet has not been tampered with while it was in-transit.
•Authentication—Determines that the message is from a valid source.
•Encryption—Scrambles the packet contents to prevent it from being seen by unauthorized sources.
SNMPv3 provides for both security models and security levels. A security model is an authentication strategy that is set up for a user and the role in which the user resides. A security level is the permitted level of security within a security model. A combination of a security model and a security level determines which security mechanism is employed when handling an SNMP packet.
This section includes the following topics:
•Security Models and Levels for SNMPv1, v2, v3
•User-Based Security Model
•CLI and SNMP User Synchronization
•Group-Based SNMP Access
Security Models and Levels for SNMPv1, v2, v3
The security level determines if an SNMP message needs to be protected from disclosure and if the message needs to be authenticated. The various security levels that exist within a security model are as follows:
•noAuthNoPriv—Security level that does not provide authentication or encryption.
•authNoPriv—Security level that provides authentication but does not provide encryption.
•authPriv—Security level that provides both authentication and encryption.
Three security models are available: SNMPv1, SNMPv2c, and SNMPv3. The security model combined with the security level determine the security mechanism applied when the SNMP message is processed.
Table 11-2 identifies what the combinations of security models and levels mean.
Table 11-2 SNMP Security Models and Levels
Model
|
Level
|
Authentication
|
Encryption
|
What Happens
|
v1
|
noAuthNoPriv
|
Community string
|
No
|
Uses a community string match for authentication.
|
v2c
|
noAuthNoPriv
|
Community string
|
No
|
Uses a community string match for authentication.
|
v3
|
noAuthNoPriv
|
Username
|
No
|
Uses a username match for authentication.
|
v3
|
authNoPriv
|
HMAC-MD5 or HMAC-SHA
|
No
|
Provides authentication based on the Hash-Based Message Authentication Code (HMAC) Message Digest 5 (MD5) algorithm or the HMAC Secure Hash Algorithm (SHA).
|
v3
|
authPriv
|
HMAC-MD5 or HMAC-SHA
|
DES
|
Provides authentication based on the HMAC-MD5 or HMAC-SHA algorithms. Provides Data Encryption Standard (DES) 56-bit encryption in addition to authentication based on the Cipher Block Chaining (CBC) DES (DES-56) standard.
|
User-Based Security Model
The SNMPv3 User-Based Security Model (USM) refers to SNMP message-level security and offers the following services:
•Message integrity—Ensures that messages have not been altered or destroyed in an unauthorized manner and that data sequences have not been altered to an extent greater than can occur nonmaliciously.
•Message origin authentication—Ensures that the claimed identity of the user on whose behalf received data was originated is confirmed.
•Message confidentiality—Ensures that information is not made available or disclosed to unauthorized individuals, entities, or processes.
SNMPv3 authorizes management operations only by configured users and encrypts SNMP messages.
Cisco NX-OS uses two authentication protocols for SNMPv3:
•HMAC-MD5-96 authentication protocol
•HMAC-SHA-96 authentication protocol
Cisco NX-OS uses Advanced Encryption Standard (AES) as one of the privacy protocols for SNMPv3 message encryption and conforms with RFC 3826.
The priv option offers a choice of DES or 128-bit AES encryption for SNMP security encryption. The priv option and the aes-128 token indicate that this privacy password is for generating a 128-bit AES key.The AES priv password can have a minimum of eight characters. If the passphrases are specified in clear text, you can specify a maximum of 64 case-sensitive alphanumeric characters. If you use the localized key, you can specify a maximum of 130 characters.
Note For an SNMPv3 operation that uses the external AAA server, you must use AES for the privacy protocol in the user configuration on the external AAA server.
CLI and SNMP User Synchronization
SNMPv3 user management can be centralized at the Access Authentication and Accounting (AAA) server level. This centralized user management allows the SNMP agent in Cisco NX-OS to leverage the user authentication service of the AAA server. Once user authentication is verified, the SNMP PDUs are processed further. Additionally, the AAA server is also used to store user group names. SNMP uses the group names to apply the access/role policy that is locally available in the switch.
Any configuration changes made to the user group, role, or password results in database synchronization for both SNMP and AAA.
Cisco NX-OS synchronizes user configuration in the following ways:
•The authentication passphrase specified in the snmp-server user command becomes the password for the CLI user.
•The password specified in the username command becomes the authentication and privacy passphrases for the SNMP user.
•If you create or delete a user using either SNMP or the CLI, the user is created or deleted for both SNMP and the CLI.
•User-role mapping changes are synchronized in SNMP and the CLI.
•Role changes (deletions or modifications) from the CLI are synchronized to SNMP.
Note When you configure a passphrase/password in localized key/encrypted format, Cisco NX-OS does not synchronize the user information (password, roles, and so on).
Cisco NX-OS holds the synchronized user configuration for 60 minutes by default. See the "Modifying the AAA Synchronization Time" section for information on how to modify this default value.
Group-Based SNMP Access
Note Because group is a standard SNMP term used industry-wide, we refer to role(s) as group(s) in this SNMP section.
SNMP access rights are organized by groups. Each group in SNMP is similar to a role through the CLI. Each group is defined with read access or read-write access.
You can begin communicating with the agent once your username is created, your roles are set up by your administrator, and you are added to the roles.
SNMP and Embedded Event Manager
The Embedded Event Manager (EEM) feature monitors events, including SNMP MIB objects, and triggers an action based on these events. One of the actions could be to send an SNMP notification. EEM sends the cEventMgrPolicyEvent of CISCO-EMBEDDED-EVENT-MGR-MIB as the SNMP notification.
See Chapter 14 "Configuring the Embedded Event Manager" for more information about EEM.
Multiple Instance Support
A device can support multiple instances of a logical network entity, such as protocol instances or VRFs. Most existing MIBs cannot distinguish between these multiple logical network entities. For example, the original OSPF-MIB assumes a single protocol instance on a device, but you can now configure multiple OSPF instances on a device.
SNMPv3 uses contexts to distinguish between these multiple instances. An SNMP context is a collection of management information you can access through the SNMP agent. A device can support multiple contexts for different logical network entities. An SNMP context allows the SNMP manager to access one of the multiple instances of a MIB module supported on the device for the different logical network entities.
Cisco NX-OS supports the CISCO-CONTEXT-MAPPING-MIB to map between SNMP contexts and logical network entities. You can associate an SNMP context to a VRF, protocol instance, or topology.
SNMPv3 supports contexts with the contextName field of the SNMPv3 PDU. You can map this contextName field to a particular protocol instance or VRF.
For SNMPv2c, you can map the SNMP community to a context using the snmpCommunityContextName MIB object in the SNMP-COMMUNITY-MIB (RFC 3584). You can then map this snmpCommunityContextName to a particular protocol instance or VRF using the CISCO-CONTEXT-MAPPING-MIB or the CLI.
To map an SNMP context to a logical network entity, follow these steps:
Step 1 Create the SNMPv3 context.
Step 2 Determine the logical network entity instance.
Step 3 Map the SNMPv3 context to a logical network entity.
Step 4 Optionally, map the SNMPv3 context to an SNMPv2c community.
For more information, see the "Configuring the Context to Network Entity Mapping" section.
High Availability
Cisco NX-OS supports stateless restarts for SNMP. After a reboot or supervisor switchover, Cisco NX-OS applies the running configuration.
Virtualization Support
Cisco NX-OS supports one instance of the SNMP per virtual device context (VDC). By default, Cisco NX-OS places you in the default VDC. For more information, see the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide, Release 5.x.
SNMP supports multiple MIB module instances and maps them to logical network entities. For more information, see the "Multiple Instance Support" section.
SNMP is also VRF aware. You can configure SNMP to use a particular VRF to reach the SNMP notification host receiver. You can also configure SNMP to filter notifications to an SNMP host receiver based on the VRF where the notification occurred. For more information, see the "Configuring SNMP Notification Receivers with VRFs" section.
Licensing Requirements for SNMP
Product
|
License Requirement
|
Cisco NX-OS
|
SNMP requires no license. Any feature not included in a license package is bundled with the Cisco NX-OS system images and is provided at no extra charge to you. For a complete explanation of the Cisco NX-OS licensing scheme, see the Cisco NX-OS Licensing Guide.
|
Prerequisites for SNMP
SNMP has the following prerequisites:
•If you configure VDCs, install the Advanced Services license and enter the desired VDC. For more information, see the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide, Release 5.x.
Guidelines and Limitations
SNMP has the following configuration guidelines and limitations:
•Cisco NX-OS supports read-only access to some SNMP MIBs. See the Cisco NX-OS MIB support list at the following URL for more information:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
Default Settings
Table 11-3 lists the default settings for SNMP parameters.
Table 11-3 Default SNMP Parameters
Parameters
|
Default
|
license notifications
|
Enabled.
|
Configuring SNMP
This section includes the following topics:
•Configuring SNMP Users
•Enforcing SNMP Message Encryption
•Assigning SNMPv3 Users to Multiple Roles
•Creating SNMP Communities
•Filtering SNMP Requests
•Configuring SNMP Notification Receivers
•Configuring a Source Interface for SNMP Notifications
•Configuring the Notification Target User
•Configuring SNMP Notification Receivers with VRFs
•Configuring SNMP to Send Traps Using an Inband Port
•Enabling SNMP Notifications
•Disabling LinkUp/LinkDown Notifications on an Interface
•Displaying SNMP ifIndex for an Interface
•Enabling a One-time Authentication for SNMP over TCP
•Assigning the SNMP Device Contact and Location Information
•Configuring the Context to Network Entity Mapping
•Disabling SNMP
•Modifying the AAA Synchronization Time
Note Be aware that the Cisco NX-OS commands for this feature may differ from those commands used in Cisco IOS.
Configuring SNMP Users
You can configure a user for SNMP.
BEFORE YOU BEGIN
Make sure that you are in the correct VDC. To change the VDC, use the switchto vdc command.
SUMMARY STEPS
1. config t
2. snmp-server user name [auth {md5 | sha} passphrase [auto] [priv [aes-128] passphrase] [engineID id] [localizedkey]]
3. show snmp user
4. copy running-config startup-config
DETAILED STEPS
| |
Command
|
Purpose
|
Step 1
|
config t
Example:
switch# config t
Enter configuration commands, one per
line. End with CNTL/Z.
switch(config)#
|
Places you in global configuration mode.
|
Step 2
|
snmp-server user name [auth {md5 | sha}
passphrase [auto] [priv [aes-128]
passphrase] [engineID id]
[localizedkey]]
Example:
switch(config)# snmp-server user Admin
auth sha abcd1234 priv abcdefgh
|
Configures an SNMP user with authentication and privacy parameters. The passphrase can be any case-sensitive alphanumeric string up to 64 characters. If you use the localizedkey keyword, the passphrase can be any case-sensitive alphanumeric string up to 130 characters.
The engineID format is a 12-digit colon-separated decimal number.
|
Step 3
|
show snmp user
Example:
switch(config-callhome)# show snmp user
|
(Optional) Displays information about one or more SNMP users.
|
Step 4
|
copy running-config startup-config
Example:
switch(config)# copy running-config
startup-config
|
(Optional) Saves this configuration change.
|
This example shows how to configure the SNMP contact and location information:
switch# config t
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)# snmp-server user Admin auth sha abcd1234 priv abcdefgh
Enforcing SNMP Message Encryption
You can configure SNMP to require authentication or encryption for incoming requests. By default, the SNMP agent accepts SNMPv3 messages without authentication and encryption. When you enforce privacy, Cisco NX-OS responds with an authorizationError for any SNMPv3 PDU request using securityLevel parameter of either noAuthNoPriv or authNoPriv.
Use the following command in global configuration mode to enforce SNMP message encryption for a user:
Command
|
Purpose
|
snmp-server user name enforcePriv
Example:
switch(config)# snmp-server user Admin
enforcePriv
|
Enforces SNMP message encryption for this user.
|
Use the following command in global configuration mode to enforce SNMP message encryption for all users:
Command
|
Purpose
|
snmp-server globalEnforcePriv
Example:
switch(config)# snmp-server
globalEnforcePriv
|
Enforces SNMP message encryption for all users.
|
Assigning SNMPv3 Users to Multiple Roles
After you configure an SNMP user, you can assign multiple roles for the user.
Note Only users belonging to a network-admin role can assign roles to other users.
Use the following command in global configuration mode to assign a role to an SNMP user:
Command
|
Purpose
|
snmp-server user name group
Example:
switch(config)# snmp-server user Admin
superuser
|
Associates this SNMP user with the configured user role.
|
Creating SNMP Communities
You can create SNMP communities for SNMPv1 or SNMPv2c.
Use the following command in global configuration mode to create an SNMP community string:
Command
|
Purpose
|
snmp-server community name group {ro | rw}
Example:
switch(config)# snmp-server community
public ro
|
Creates an SNMP community string.
|
Filtering SNMP Requests
You can assign an access list (ACL) to a community to filter incoming SNMP requests. If the assigned ACL allows the incoming request packet, SNMP processes the request. If the ACL denies the request, SNMP drops the request and sends a system message.
Create the ACL with the following parameters:
•Source IP address
•Destination IP address
•Source port
•Destination port
•Protocol (UDP or TCP)
See the Cisco Nexus 7000 Series NX-OS Security Configuration Guide, Release 5.x for more information on creating ACLs. The ACL applies to both IPv4 and IPv6 over UDP and TCP.
Use the following command in global configuration mode to assign an ACL to a community to filter SNMP requests:
Command
|
Purpose
|
snmp-server community community-name
use-acl acl-name
Example:
switch(config)# snmp-server community
public use-acl my_acl_for_public
|
Assigns an ACL to an SNMP community to filter SNMP requests.
|
Configuring SNMP Notification Receivers
You can configure Cisco NX-OS to generate SNMP notifications to multiple host receivers.
Use the following command in global configuration mode to configure a host receiver for SNMPv1 traps:
Command
|
Purpose
|
snmp-server host ip-address traps version
1 community [udp_port number]
Example:
switch(config)# snmp-server host 192.0.2.1
traps version 1 public
|
Configures a host receiver for SNMPv1 traps. The ip-address can be an IPv4 or IPv6 address. The community can be any alphanumeric string up to 255 characters. The UDP port number range is from 0 to 65535.
|
Use the following command in global configuration mode to configure a host receiver for SNMPv2c traps or informs:
Command
|
Purpose
|
snmp-server host ip-address {traps |
informs} version 2c community [udp_port
number]
Example:
switch(config)# snmp-server host 192.0.2.1
informs version 2c public
|
Configures a host receiver for SNMPv2c traps or informs. The ip-address can be an IPv4 or IPv6 address. The community can be any alphanumeric string up to 255 characters. The UDP port number range is from 0 to 65535.
|
Use the following command in global configuration mode to configure a host receiver for SNMPv3 traps or informs:
Command
|
Purpose
|
snmp-server host ip-address {traps |
informs} version 3 {auth | noauth | priv}
username [udp_port number]
Example:
switch(config)# snmp-server host 192.0.2.1
informs version 3 auth NMS
|
Configures a host receiver for SNMPv3 traps or informs. The ip-address can be an IPv4 or IPv6 address. The username can be any alphanumeric string up to 255 characters. The UDP port number range is from 0 to 65535.
|
Note The SNMP manager must know the user credentials (authKey/PrivKey) based on the SNMP engine ID of the Cisco NX-OS device to authenticate and decrypt the SNMPv3 messages.
Configuring a Source Interface for SNMP Notifications
You can configure SNMP to use the IP address of an interface as the source IP address for notifications. When a notification is generated, its source IP address is based on the IP address of this configured interface.
You can configure this as follows:
•All notifications sent to all SNMP notification receivers.
•All notifications sent to a specific SNMP notification receiver. This configuration overrides the global source interface configuration.
Note Configuring the source interface IP address for outgoing trap packets does not guarantee that the device will use the same interface to send the trap. The source interface IP address defines the source address inside of the SNMP trap, and the connection is opened with the address of the egress interface as source.
Use the following command in global configuration mode to configure a host receiver on a source interface:
Command
|
Purpose
|
snmp-server host ip-address
source-interface if-type if-number
[udp_port number]
Example:
switch(config)# snmp-server host 192.0.2.1
source-interface ethernet 2/1
|
Configures a host receiver for SNMPv2c traps or informs. The ip-address can be an IPv4 or IPv6 address. Use ? to determine the supported interface types. The UDP port number range is from 0 to 65535.
This configuration overrides the global source interface configuration.
|
Use the following command in global configuration mode to configure a source interface for sending out all SNMP notifications:
Command
|
Purpose
|
snmp-server source-interface {traps |
informs} if-type if-number
Example:
switch(config)# snmp-server
source-interface traps ethernet 2/1
|
Configures a source interface for sending out SNMPv2c traps or informs. Use ? to determine the supported interface types.
|
Use the show snmp source-interface command to display information about configured source interfaces.
Configuring the Notification Target User
You must configure a notification target user on the device to send SNMPv3 inform notifications to a notification host receiver.
Cisco NX-OS uses the credentials of the notification target user to encrypt the SNMPv3 inform notification messages to the configured notification host receiver.
Note For authenticating and decrypting the received inform PDU, the notification host receiver should have the same user credentials as configured in Cisco NX-OS to authenticate and decrypt the informs.
Use the following command in global configuration mode to configure the notification target user:
Command
|
Purpose
|
snmp-server user name [auth {md5 | sha}
passphrase [auto] [priv [aes-128]
passphrase] [engineID id]
Example:
switch(config)# snmp-server user NMS auth
sha abcd1234 priv abcdefgh engineID
00:00:00:63:00:01:00:10:20:15:10:03
|
Configures the notification target user with the specified engine ID for the notification host receiver. The engineID format is a 12-digit colon-separated decimal number.
|
Configuring SNMP Notification Receivers with VRFs
SNMP adds entries into the cExtSnmpTargetVrfTable of the CISCO-SNMP-TARGET-EXT-MIB when you configure the VRF reachability and filtering options for an SNMP notification receiver.
Note You must configure the host before configuring the VRF reachability or filtering options.
You can configure Cisco NX-OS to use a configured VRF to reach the host receiver.
Use the following command in global configuration mode to configure a VRF to use for sending notifications to the host receiver:
Command
|
Purpose
|
snmp-server host ip-address use-vrf
vrf_name [udp_port number]
Example:
switch(config)# snmp-server host 192.0.2.1
use-vrf Blue
|
Configures SNMP to use the selected VRF to communicate with the host receiver. The ip-address can be an IPv4 or IPv6 address. The VRF name can be any alphanumeric string up to 255 characters. The UDP port number range is from 0 to 65535. This command adds an entry into thc ExtSnmpTargetVrfTable of the CISCO-SNMP-TARGET-EXT-MB.
|
no snmp-server host ip-address use-vrf
vrf_name [udp_port number]
Example:
switch(config)# no snmp-server host
192.0.2.1 use-vrf Blue
|
Removes the VRF reachability information for the configured host, and removes the entry from thc ExtSnmpTargetVrfTable of the CISCO-SNMP-TARGET-EXT-MB.
The ip-address can be an IPv4 or IPv6 address.
Does not remove the host configuration.
|
You can configure Cisco NX-OS filter notifications based on the VRF in which the notification occurred.
Use the following command in global configuration mode to filter notifications based on a configured VRF:
Command
|
Purpose
|
snmp-server host ip-address filter-vrf
vrf_name [udp_port number]
Example:
switch(config)# snmp-server host 192.0.2.1
filter-vrf Red
|
Filters notifications to the notification host receiver based on the configured VRF. The ip-address can be an IPv4 or IPv6 address. The VRF name can be any alphanumeric string up to 255 characters. The UDP port number range is from 0 to 65535.
This command adds an entry into thc ExtSnmpTargetVrfTable of the CISCO-SNMP-TARGET-EXT-MB.
|
no snmp-server host ip-address filter-vrf
vrf_name
Example:
switch(config)# no snmp-server host
192.0.2.1 filter-vrf Red
|
Removes the VRF filter information for the configured host, and removes the entry from thc ExtSnmpTargetVrfTable of the CISCO-SNMP-TARGET-EXT-MB.
The ip-address can be an IPv4 or IPv6 address. This command does not remove the host configuration.
|
Configuring SNMP to Send Traps Using an Inband Port
You can configure SNMP to send traps using an inband port. To do so, you must configure the source interface (at the global or host level) and the VRF used to send the traps.
SUMMARY STEPS
1. config t
2. snmp-server source-interface traps if-type if-number
3. show snmp source-interface
4. snmp-server host ip-address use-vrf vrf_name [udp_port number]
5. show snmp host
6. copy running-config startup-config
DETAILED STEPS
| |
Command
|
Purpose
|
Step 1
|
config t
Example:
switch# config t
Enter configuration commands, one per
line. End with CNTL/Z.
switch(config)#
|
Places you in global configuration mode.
|
Step 2
|
snmp-server source-interface traps
if-type if-number
Example:
switch(config)# snmp-server
source-interface traps ethernet 1/2
|
Globally configures a source interface for sending out SNMP traps. Use ? to determine the supported interface types.
You can configure the source interface at the global level or at a host level. When the source interface is configured globally, any new host configuration uses the global configuration to send the traps.
Note To configure a source interface at the host level, use this command: snmp-server host ip-address source-interface if-type if-number.
|
Step 3
|
show snmp source-interface
Example:
switch(config)# show snmp
source-interface
|
(Optional) Displays information about configured source interfaces.
|
Step 4
|
snmp-server host ip-address use-vrf
vrf_name [udp_port number]
Example:
switch(config)# snmp-server host
171.71.48.164 use_vrf default
|
Configures SNMP to use the selected VRF to communicate with the host receiver. The ip-address can be an IPv4 or IPv6 address. The VRF name can be any alphanumeric string up to 255 characters. The UDP port number range is from 0 to 65535. This command adds an entry into the ExtSnmpTargetVrfTable of the CISCO-SNMP-TARGET-EXT-MB.
Note By default, SNMP sends the traps using the management VRF. If you do not want to use the management VRF, you must use this command to specify the desired VRF.
|
Step 5
|
show snmp host
Example:
switch(config)# show snmp host
|
(Optional) Displays information about configured SNMP hosts.
|
Step 6
|
copy running-config startup-config
Example:
switch(config)# copy running-config
startup-config
|
(Optional) Saves this configuration change.
|
This example shows how to configure SNMP to send traps using a globally configured inband port:
switch# config t
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)# snmp-server source-interface traps ethernet 1/2
switch(config)# show snmp source-interface
-------------------------------------------------------------------
Notification source-interface
-------------------------------------------------------------------
trap Ethernet1/2
inform -
-------------------------------------------------------------------
switch(config)# snmp-server host 171.71.48.164 use_vrf default
switch(config)# show snmp host
-------------------------------------------------------------------
Host Port Version Level Type SecName
-------------------------------------------------------------------
171.71.48.164 162 v2c noauth trap public
Use VRF: default
Source interface: Ethernet 1/2
-------------------------------------------------------------------
Enabling SNMP Notifications
You can enable or disable notifications. If you do not specify a notification name, Cisco NX-OS enables all notifications.
Table 11-4 lists the commands that enable the notifications for Cisco NX-OS MIBs.
Note The snmp-server enable traps command enables both traps and informs, depending on the configured notification host receivers.
Table 11-4 Enabling SNMP Notifications
MIB
|
Related Commands
|
All notifications
|
snmp-server enable traps
|
CISCO-AAA-SERVER-MIB
|
snmp-server enable traps aaa
snmp-server enable traps aaa server-state-change
|
CISCO-BGP4-MIB
|
snmp-server enable traps bgp
|
CISCO-STP-BRIDGE-MIB
|
snmp-server enable traps bridge
snmp-server enable traps bridge newroot
snmp-server enable traps bridge topologychange
|
CISCO-CALLHOME-MIB
|
snmp-server enable traps callhome
snmp-server enable traps callhome event-notify
snmp-server enable traps callhome smtp-send-fail
|
CISCO-CFS-MIB
|
snmp-server enable traps cfs
snmp-server enable traps cfs merge-failure
snmp-server enable traps cfs state-change-notif
|
CISCO-CONFIG-MAN-MIB
|
snmp-server enable traps config
snmp-server enable traps config ccmCLIRunningConfigChanged
|
CISCO-EIGRP-MIB
|
snmp-server enable traps eigrp [tag]
|
ENTITY-MIB, CISCO-ENTITY-SENSOR-
MIB
|
snmp-server enable traps entity
snmp-server enable traps entity entity_fan_status_change
snmp-server enable traps entity entity_mib_change
snmp-server enable traps entity entity_module_inserted
snmp-server enable traps entity entity_module_removed
snmp-server enable traps entity entity_module_status_change
snmp-server enable traps entity entity_power_out_change
snmp-server enable traps entity entity_power_status_change
snmp-server enable traps entity entity_unrecognised_module
|
CISCO-FEATURE-
CONTROL-MIB
|
snmp-server enable traps feature-control
snmp-server enable traps feature-control FeatureOpStatusChange
|
CISCO-HSRP-MIB
|
snmp-server enable traps hsrp
snmp-server enable traps hsrp state-change
|
CISCO-LICENSE-MGR-MIB
|
snmp-server enable traps license
snmp-server enable traps license notify-license-expiry
snmp-server enable traps license notify-license-expiry-warning
snmp-server enable traps license notify-licensefile-missing
snmp-server enable traps license notify-no-license-for-feature
|
IF-MIB
|
snmp-server enable traps link
snmp-server enable traps link IETF-extended-linkDown
snmp-server enable traps link IETF-extended-linkUp
snmp-server enable traps link cisco-extended-linkDown
snmp-server enable traps link cisco-extended-linkUp
snmp-server enable traps link linkDown
snmp-server enable traps link Up
|
OSPF-MIB, OSPF-TRAP-MIB
|
snmp-server enable traps ospf [tag]
snmp-server enable traps ospf lsa
snmp-server enable traps ospf rate-limit rate
|
CISCO-PORT-SECURITY-
MIB
|
snmp-server enable traps port-security
snmp-server enable traps port-security access-secure-mac-violation
snmp-server enable traps port-security trunk-secure-mac-violation
|
CISCO-RF-MIB
|
snmp-server enable traps rf
snmp-server enable traps rf redundancy_framework
|
CISCO-RMON-MIB
|
snmp-server enable traps rmon
snmp-server enable traps rmon fallingAlarm
snmp-server enable traps rmon hcFallingAlarm
snmp-server enable traps rmon hcRisingAlarm
snmp-server enable traps rmon risingAlarm
|
SNMPv2-MIB
|
snmp-server enable traps snmp
snmp-server enable traps snmp authentication
|
CISCO-STPX-MIB
|
snmp-server enable traps stpx
snmp-server enable traps stpx inconsistency
snmp-server enable traps stpx loop-inconsistency
snmp-server enable traps stpx root-inconsistency
|
CISCO-SYSTEM-EXT-MIB
|
sysmgr
sysmgr cseFailSwCoreNotifyExtended
|
UPGRADE-MIB
|
upgrade
upgrade UpgradeJobStatusNotify
upgrade UpgradeOpNotifyOnCompletion
|
ZONE-MIB
|
zone
zone default-zone-behavior-change
zone merge-failure
zone merge-success
zone request-reject1
zone unsupp-mem
|
Use the following commands in global configuration mode to enable the specified notification:
Command
|
Purpose
|
snmp-server enable traps
Example:
switch(config)# snmp-server enable traps
|
Enables all SNMP notifications.
|
snmp-server enable traps aaa
[server-state-change]
Example:
switch(config)# snmp-server enable traps
aaa
|
Enables AAA SNMP notifications. Optionally, enables the following specific notifications:
•server-state-change—Enables AAA server state-change notifications.
|
snmp-server enable traps bgp
Example:
switch(config)# snmp-server enable traps
bgp
|
Enables BGP SNMP notifications.
|
snmp-server enable traps bridge
[newroot]
[topologychange]
Example:
switch(config)# snmp-server enable traps
bridge
|
Enables STP bridge SNMP notifications. Optionally, enables the following specific notifications:
•newroot—Enables STP new root bridge notifications.
•topologychange—Enables STP bridge topology-change notifications.
|
snmp-server enable traps callhome
[event-notify]
[smtp-send-fail]
Example:
switch(config)# snmp-server enable traps
callhome
|
Enables Call Home notifications. Optionally, enables the following specific notifications:
•event-notify—Enables Call Home external event notifications.
•smtp-send-fail—Enables Simple Mail Transfer Protocol (SMTP) message send fail notifications.
|
snmp-server enable traps cfs
[merge-failure]
[state-change-notif]
Example:
switch(config)# snmp-server enable traps
cfs
|
Enables Cisco Fabric Services (CFS) notifications. Optionally, enables the following specific notifications:
•merge-failure—Enables CFS merge-failure notifications.
•state-change-notif—Enables CFS state-change notifications.
|
snmp-server enable traps config
[ccmCLIRunningConfigChanged]
Example:
switch(config)# snmp-server enable traps
config
|
Enables SNMP notifications for configuration changes.
•ccmCLIRunningConfigChanged—Enables SNMP notifications for configuration changes in the running or startup configuration.
|
snmp-server enable traps eigrp [tag]
Example:
switch(config)# snmp-server enable traps
eigrp
|
Enables CISCO-EIGRP-MIB SNMP notifications.
|
snmp-server enable traps entity
[entity_fan_status_change]
[entity_mib_change]
[entity_module_inserted]
[entity_module_removed]
[entity_module_status_change]
[entity_power_out_change]
[entity_power_status_change]
[entity_unrecognised_module]
Example:
switch(config)# snmp-server enable traps
entity
|
Enables ENTITY-MIB SNMP notifications. Optionally, enables the following specific notifications:
•entity_fan_status_change—Enables entity fan status-change notifications.
•entity_mib_change—Enables entity MIB change notifications.
•entity_module_inserted—Enables entity module inserted notifications.
•entity_module_removed—Enables entity module removed notifications.
•entity_module_status_change—Enables entity module status-change notifications.
•entity_power_out_change—Enables entity power-out change notifications.
•entity_power_status_change—Enables entity power status-change notifications.
•entity_unrecognised_module—Enables entity unrecognized module notifications.
|
snmp-server enable traps feature-control
[FeatureOpStatusChange]
Example:
switch(config)# snmp-server enable traps
feature-control
|
Enables feature-control SNMP notifications. Optionally, enables the following specific notifications:
•FeatureOpStatusChange—Enables feature operation status-change notifications.
|
snmp-server enable traps hsrp
[state-change]
Example:
switch(config)# snmp-server enable traps
hsrp
|
Enables CISCO-HSRP-MIB SNMP notifications. Optionally, enables the following specific notifications:
•state-change—Enables HSRP state-change notifications.
|
snmp-server enable traps license
[notify-license-expiry]
[notify-license-expiry-warning]
[notify-licensefile-missing]
[notify-no-license-for-feature]
Example:
switch(config)# snmp-server enable traps
license
|
Enables license SNMP notifications. Optionally, enables the following specific notifications:
•notify-license-expiry—Enables license expiry notifications.
•notify-license-expiry-warning—Enables license expiry warning notifications.
•notify-licensefile-missing—Enables license file-missing notifications.
•notify-no-license-for-feature—Enables no-license-installed-for-feature notifications.
|
snmp-server enable traps link
[IETF-extended-linkDown]
[IETF-extended-linkUp]
[cisco-extended-linkDown]
[cisco-extended-linkUp]
[linkDown]
[linkUp]
Example:
switch(config)# snmp-server enable traps
link
|
Enables IF-MIB link notifications. Optionally, enables the following specific notifications:
•IETF-extended-linkDown—Enables Internet Engineering Task Force (IETF) extended link state down notifications.
•IETF-extended-linkUp—Enables Internet Engineering Task Force (IETF) extended link state up notifications.
•cisco-extended-linkDown—Enables Cisco extended link state down notifications.
•cisco-extended-linkUp—Enables Cisco extended link state up notifications.
•linkDown—Enables IETF link state down notifications.
•linkUp—Enables IETF link state up notifications.
|
snmp-server enable traps ospf [tag]
[lsa]
[rate-limit rate]
Example:
switch(config)# snmp-server enable traps
ospf
|
Enables open shortest path first (OSPF) notifications. Optionally, enables the following specific notifications:
•lsa—Enables OSPF LSA notifications.
•rate-limit rate—Enables rate limits on OSPF notifications. The range is from 2 to 60 seconds. The default is 10 seconds.
|
snmp-server enable traps port-security
[access-secure-mac-violation]
[trunk-secure-mac-violation]
Example:
switch(config)# snmp-server enable traps
port-security
|
Enables port-security SNMP notifications. Optionally, enables the following specific notifications:
•access-secure-mac-violation—Enables secure machine access control (MAC) violation notifications.
•trunk-secure-mac-violation—Enables virtual LAN (VLAN) secure MAC violation notifications.
|
snmp-server enable traps rf
[redundancy-framework]
Example:
switch(config)# snmp-server enable traps rf
|
Enables redundancy framework (RF) SNMP notifications. Optionally, enables the following specific notifications:
•redundancy-framework—Enables RF Supervisor switchover MIB notifications.
|
snmp-server enable traps rmon
[fallingAlarm]
[hcFallingAlarm]
[hcRisingAlarm]
[risingAlarm]
Example:
switch(config)# snmp-server enable traps
rmon
|
Enables remote monitoring (RMON) SNMP notifications. Optionally, enables the following specific notifications:
•fallingAlarm—Enables RMON falling alarm notifications.
•hcFallingAlarm—Enables RMON high-capacity falling alarm notifications.
•hcRisingAlarm—Enables RMON high-capacity rising alarm notifications.
•risingAlarm—Enables RMON rising alarm notifications.
|
snmp-server enable traps snmp
[authentication]
Example:
switch(config)# snmp-server enable traps
snmp
|
Enables general SNMP notifications. Optionally, enables the following specific notifications:
•authentication—Enables SNMP authentication notifications.
|
snmp-server enable traps stpx
[inconsistency]
[loop-inconsistency]
[root-inconsistency]
Example:
switch(config)# snmp-server enable traps
stpx
|
Enables STPX MIB notifications. Optionally, enables the following specific notifications:
•inconsistency—Enables SNMP STPX MIB inconsistency update notifications.
•loop-inconsistency—Enables SNMP STPX MIB loop-inconsistency update notifications.
•root-inconsistency—Enables SNMP STPX MIB root-inconsistency update notifications.
|
snmp-server enable traps sysmgr
[cseFailSwCoreNotifyExtended]
Example:
switch(config)# snmp-server enable traps
sysmgr
|
Enables software change notifications. Optionally, enables the following specific notifications:
•cseFailSwCoreNotifyExtended—Enables software core notifications.
|
snmp-server enable traps upgrade
[UpgradeJobStatusNotify]
[UpgradeOpNotifyOnCompletion]
Example:
switch(config)# snmp-server enable traps
upgrade
|
Enables upgrade notifications. Optionally, enables the following specific notifications:
•UpgradeJobStatusNotify—Enables upgrade job status notifications.
•UpgradeOpNotifyOnCompletion—Enables upgrade global status notifications.
|
snmp-server enable traps vtp
[notifs]
[vlancreate]
[vlandelete]
Example:
switch(config)# snmp-server enable traps
vtp
|
Enables upgrade notifications. Optionally, enables the following specific notifications:
•notifs—Enables VTP notifications.
•vlancreate—Enables VLAN creation notifications.
•vlandelete—Enables VLAN deletion notifications.
|
snmp-server enable traps zone
[default-zone-behavior-change]
[merge-failure]
[merge-success]
[request-reject1]
[unsupp-mem]
Example:
switch(config)# snmp-server enable traps
zone
|
Enables default zone change notifications. Optionally, enables the following specific notifications:
•default-zone-behavior-change—Enables default zone behavior change notifications.
•merge-failure—Enables merge failure notifications.
•merge-success—Enables merge success notifications.
•request-reject1—Enables request reject notifications.
•unsupp-mem—Enables unsupported member notifications.
|
Disabling LinkUp/LinkDown Notifications on an Interface
You can disable linkUp and linkDown notifications on an individual interface. You can use these limit notifications on a flapping interface (an interface that transitions between up and down repeatedly).
Use the following command in interface configuration mode to disable linkUp/linkDown notifications for the interface:
Command
|
Purpose
|
no snmp trap link-status
Example:
switch(config-if)# no snmp trap link-status
|
Disables SNMP link-state traps for the interface. This command is enabled by default.
|
Displaying SNMP ifIndex for an Interface
The SNMP ifIndex is used across multiple SNMP MIBs to link related interface information. The ifIndex is also used by NetFlow to collect information on an interface.
Use the following command in any mode to display the SNMP ifIndex values for interfaces:
Command
|
Purpose
|
show interface snmp-ifindex
Example:
switch# show interface snmp-ifindex | grep
-i Eth12/1
Eth12/1 441974784 (0x1a580000)
|
Displays the persistent SNMP ifIndex value from IF-MIB for all interfaces. Optionally, use the | keyword and the grep keyword to search for a particular interface in the output.
|
Enabling a One-time Authentication for SNMP over TCP
You can enable a one-time authentication for SNMP over a TCP session.
Use the following command in global configuration mode to enable a one-time authentication for SNMP over TCP:
Command
|
Purpose
|
snmp-server tcp-session [auth]
Example:
switch(config)# snmp-server tcp-session
|
Enables a one-time authentication for SNMP over a TCP session. The default is disabled.
|
Assigning the SNMP Device Contact and Location Information
You can assign the device contact information, which is limited to 32 characters (without spaces) and the device location.
BEFORE YOU BEGIN
Make sure that you are in the correct VDC. To change the VDC, use the switchto vdc command.
SUMMARY STEPS
1. config t
2. snmp-server contact name
3. snmp-server location name
4. show snmp
5. copy running-config startup-config
DETAILED STEPS
| |
Command
|
Purpose
|
Step 1
|
config t
Example:
switch# config t
Enter configuration commands, one per
line. End with CNTL/Z.
switch(config)#
|
Places you in global configuration mode.
|
Step 2
|
snmp-server contact name
Example:
switch(config)# snmp-server contact
Admin
|
Configures sysContact, which is the SNMP contact name.
|
Step 3
|
snmp-server location name
Example:
switch(config)# snmp-server location
Lab-7
|
Configures sysLocation, which is the SNMP location.
|
Step 4
|
show snmp
Example:
switch(config)# show snmp
|
(Optional) Displays information about one or more destination profiles.
|
Step 5
|
copy running-config startup-config
Example:
switch(config)# copy running-config
startup-config
|
(Optional) Saves this configuration change.
|
This example shows how to configure the SNMP contact and location information:
switch# config t
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)# snmp contact Admin
switch(config)# snmp location Lab-7
Configuring the Context to Network Entity Mapping
You can configure an SNMP context to map to a logical network entity, such as a protocol instance or VRF.
BEFORE YOU BEGIN
Make sure that you are in the correct VDC. To change the VDC, use the switchto vdc command.
Determine the logical network entity instance. For more information on VRFs and protocol instances, see the Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 5.x, or the Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide, Release 5.x.
SUMMARY STEPS
1. config t
2. snmp-server context context-name [instance instance-name] [vrf vrf-name] [topology topology-name]
3. snmp-server mib community-map community-name context context-name
4. show snmp context
5. copy running-config startup-config
DETAILED STEPS
| |
Command
|
Purpose
|
Step 1
|
config t
Example:
switch# config t
Enter configuration commands, one per
line. End with CNTL/Z.
switch(config)#
|
Places you in global configuration mode.
|
Step 2
|
snmp-server context context-name
[instance instance-name] [vrf vrf-name]
[topology topology-name]
Example:
switch(config)# snmp-server context
public1 vrf red
|
Maps an SNMP context to a protocol instance, VRF, or topology. The names can be any alphanumeric string up to 32 characters.
|
Step 3
|
snmp-server mib community-map
community-name context context-name
Example:
switch(config)# snmp-server mib
community-map public context public1
|
(Optional) Maps an SNMPv2c community to an SNMP context. The names can be any alphanumeric string up to 32 characters.
|
Step 4
|
show snmp context
Example:
switch(config)# show snmp context
|
(Optional) Displays information about one or more SNMP contexts.
|
Step 5
|
copy running-config startup-config
Example:
switch(config)# copy running-config
startup-config
|
(Optional) Saves this configuration change.
|
This example shows how to map VRF red to the SNMPv2c public community string:
switch# config t
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)# vrf context red
switch(config-vrf)# exit
switch(config)# snmp-server context public1 vrf red
switch(config)# snmp-server mib community-map public context public1
This example shows how to map OSPF instance Enterprise to the same SNMPv2c public community string:
switch# config t
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)# feature ospf
switch(config)# router ospf Enterprise
switch(config-router)# exit
switch(config)# snmp-server context public1 instance Enterprise
switch(config)# snmp-server mib community-map public context public1
Use the following command in global configuration mode to delete the mapping between an SNMP context and a logical network entity:
Command
|
Purpose
|
no snmp-server context context-name
[instance instance-name] [vrf vrf-name]
[topology topology-name]
Example:
switch(config)# no snmp-server context
public1
|
Deletes the mapping between an SNMP context and a protocol instance, VRF, or topology. The names can be any alphanumeric string up to 32 characters.
Note Do not enter an instance, VRF, or topology to delete a context mapping. If you use the instance, vrf, or topology keywords, you configure a mapping between the context and a zero-length string.
|
Disabling SNMP
You can disable SNMP on a device.
Use the following command in global configuration mode to disable SNMP:
Command
|
Purpose
|
no snmp-server protocol enable
Example:
switch(config)# no snmp-server protocol
enable
|
Disables SNMP. This command is enabled by default.
|
Modifying the AAA Synchronization Time
You can modify how long Cisco NX-OS holds the synchronized user configuration.
Use the following command in global configuration mode to modify the AAA synchronization time:
Command
|
Purpose
|
snmp-server aaa-user cache-timeout seconds
Example:
switch(config)# snmp-server aaa-user
cache-timeout 1200.
|
Configures how long the AAA synchronized user configuration stays in the local cache. The range is from 1 to 86400 seconds. The default is 3600.
|
Verifying the SNMP Configuration
To display the SNMP configuration information, perform one of the following tasks:
Command
|
Purpose
|
show interface snmp-ifindex
|
Displays the SNMP ifIndex value for all interfaces (from IF-MIB).
|
show running-config snmp [all]
|
Displays the SNMP running configuration.
|
show snmp
|
Displays the SNMP status.
|
show snmp community
|
Displays the SNMP community strings.
|
show snmp context
|
Displays the SNMP context mapping.
|
show snmp engineID
|
Displays the SNMP engineID.
|
show snmp group
|
Displays SNMP roles.
|
show snmp host
|
Displays information about configured SNMP hosts.
|
show snmp session
|
Displays SNMP sessions.
|
show snmp source-interface
|
Displays information about configured source interfaces.
|
show snmp trap
|
Displays the SNMP notifications enabled or disabled.
|
show snmp user
|
Displays SNMPv3 users.
|
Configuration Examples for SNMP
This example shows how to configure Cisco NX-OS to send the Cisco linkUp or Down notifications to one notification host receiver using the Blue VRF and defines two SNMP users, Admin and NMS:
snmp-server contact Admin@company.com
snmp-server user Admin auth sha abcd1234 priv abcdefgh
snmp-server user NMS auth sha abcd1234 priv abcdefgh engineID
00:00:00:63:00:01:00:22:32:15:10:03
snmp-server host 192.0.2.1 informs version 3 auth NMS
snmp-server host 192.0.2.1 use-vrf Blue
snmp-server enable traps link cisco
This example shows how to configure SNMP to send traps using an inband port configured at the host level:
switch# config t
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)# snmp-server host 171.71.48.164 version 2c public
switch(config)# snmp-server host 171.71.48.164 source-interface ethernet 1/2
switch(config)# show snmp host
-------------------------------------------------------------------
Host Port Version Level Type SecName
-------------------------------------------------------------------
171.71.48.164 162 v2c noauth trap public
Source interface: Ethernet 1/2
-------------------------------------------------------------------
switch(config)# snmp-server host 171.71.48.164 use_vrf default
switch(config)# show snmp host
-------------------------------------------------------------------
Host Port Version Level Type SecName
-------------------------------------------------------------------
171.71.48.164 162 v2c noauth trap public
Source interface: Ethernet 1/2
-------------------------------------------------------------------
Additional References
For additional information related to implementing SNMP, see the following sections:
•Related Documents
•Standards
•MIBs
Related Documents
Standards
Standards
|
Title
|
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.
|
—
|
MIBs
Feature History for SNMP
Table 11-5 lists the release history for this feature.
Table 11-5 Feature History for SNMP
Feature Name
|
Releases
|
Feature Information
|
SNMP protocol
|
5.2(1)
|
No change from Release 5.1.
|
SNMP protocol
|
5.1(1)
|
No change from Release 5.0.
|
SNMP notifications
|
5.0(2)
|
Updated the snmp-server enable traps commands. See the "Enabling SNMP Notifications" section.
|
IPv6 support
|
4.2(1)
|
Supports configuring IPv6 SNMP hosts.
|
Filter SNMP requests by community using an ACL
|
4.2(1)
|
Assigns an ACL to an SNMP community to filter SNMP requests. See the "Filtering SNMP Requests" section.
|
Use interfaces for SNMP notification receivers
|
4.2(1)
|
Adds support to designate an interface to act as the source interface for SNMP notifications. See the "Configuring SNMP Notification Receivers" section.
|
SNMP AAA synchronization
|
4.0(3)
|
Adds ability to modify the synchronized user configuration timeout. See the "Modifying the AAA Synchronization Time" section.
|
SNMP protocol
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4.0(3)
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Added ability to disable the SNMP protocol. See the "Disabling SNMP" section.
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