How to exclude specific device from SNMP polling in NFA

Products

Network Flow Analysis

Issue/Introduction

While using Network Flow Analysis, you may encounter issues with SNMP polling devices. Previously with NFA, if you could not SNMP a device you would eventually see your device get it self into a state of RebootRefresh as NFA did require SNMP connectivity for netflow devices to work properly. On all supported versions we can specify if we want SNMP Polling enabled or disable from the NetOps Portal NFA Flow Administration.

In older NFA versions, you could only turn on "IgnoreReboots" globally, and that would affect all routers. This allows you to exclude specific devices and still allow NFA to poll other devices.

Environment

Release : 22.2.8+

Component : Network Flow Analysis

Cause

Certain devices such as VMware hosts or other devices where you just may not have SNMP connectivity may need exemptions from the SNMP connectivity requirement due to software limitations or network restrictions.

Resolution

You can now enable or disable SNMP polling for a router. This ability helps you decide whether you want to perform SNMP polling on a device and collect the related SNMP data. If you do not want to collect the SNMP data, you can disable the SNMP polling functionality. Similarly, to collect the data, enable the polling.

For more information about how to perform this configuration in

NetOps Portal, see Configure SNMP Polling. For more information about the updated APIs, see Edit Router - Single and Edit Routers - Bulk.

(22.2.8 and higher) You can enable or disable SNMP polling for a router. This ability helps you decide whether you want to perform SNMP polling on a device and collect the related SNMP data. If you do not want to collect the SNMP data, you can disable the SNMP polling functionality. Similarly, to collect the data, enable the polling.

Follow these steps in the NetOps Portal:

Hover over Administration, Data Sources, and then click the NFA data source. Verify that Manage Monitoring is selected under Monitored Interfaces.
Select the router for which you want to configure the SNMP polling, and then click Edit.
1. You can also select multiple routers at the same time and enable or disable their SNMP polling.
2. Use the Quick Filter to search for the required router if you have a long list.
For SNMP Polling, specify whether SNMP polling is enabled or disabled, and then click Save.

Enabled: Indicates that you want to perform SNMP polling on devices.
Disabled: Indicates that you do not want to perform SNMP polling on devices.

Note: Disabling SNMP polling disables the ability to discover SNMP profiles for devices or routers, to refresh SNMP routers, and to test SNMP profiles for devices or routers.
(Optional) To quickly view the SNMP polling status, add the SNMP Polling column to the table. Hover over any existing column (for example, Harvester Address), click the gear icon, and then select Column, SNMP Polling. The column is added to the table along with the corresponding value (Disabled or Enabled) for each row.

Additional Information

See the following KB for information on how to get devices out of "RebootRefresh" if they are already in RebootRefresh and rejecting data:

https://knowledge.broadcom.com/external/article?articleId=108068

In 9.3.6 and later you can run the following commands on the Harvesters to reset the state of the router to allow it to collect data again:

mysql -unetqos -pnetqos harvester
update routers set pollState='InitialPoll', stateretry=0, reboottime=0 where pollstate ='RebootRefresh';