Cisco ACI SNMP connection error on Aria Operations for Networks.

Products

• VMware Aria Operations for Networks
• VMware vRealize Network Insight 6.x

Issue/Introduction

After enabling SNMP on cisco ACI observing the following SNMP connection error in Aria Operations for Networks.

Environment

VMware vRealize Network Insight 6.9
Aria Operations for Networks 6.10.0
Aria Operations for Networks 6.11.0
Aria Operations for Networks 6.12.0
Aria Operations for Networks 6.12.1
Aria Operations for Networks 6.13.0
Aria Operations for Networks 6.14.0

Cause

Following error can be seen on collector at /var/log/arkin/collector.log

2025-01-29T07:17:19.857Z INFO aci.tasks.ACIRestTask CISCOACI_xxxxxxxxx_OpMgr-0 doRun:79 Type : EPG, Entities size : 20
2025-01-29T07:17:19.894Z WARN common.snmp.SNMPPollingTask CISCOACI_xxxxxxxxx_metric_OpMgr-0 fetch:433 error while processing row from managerType=CISCOACI managerHost=aci_dcm2 row=org.snmp4j.util.TableEvent[index=null,vbs=null,status=-1,exception=null,report=null] oid=metricOID: "1.3.6.1.2.1.31.1.1.1.6"
instanceOID: "1.3.6.1.2.1.31.1.1.1.1"
discontinuityTimeOID: "1.3.6.1.2.1.31.1.1.1.19"
error=Request timed out.
2025-01-29T07:17:19.895Z INFO dataproviders.tasker.Tasker_TaskerCallBack CISCOACI_xxxxxxxxx_metric_OpMgr-0 <init>:112 Creating callback 8757678: TaskContext

{taskType=ASYNC, taskIdentifier=com.vnera.dataproviders.core.common.snmp.SNMPPollingTask_scheduled}
2025-01-29T07:17:19.895Z WARN common.utils.CommonUtils CISCOACI_xxxxxxxxx_metric_OpMgr-0 logException:2555 com.vnera.dataproviders.dsconnectionmanagement.exceptions.SNMPConnectionException: Request timed out
java.lang.RuntimeException: com.vnera.dataproviders.dsconnectionmanagement.exceptions.SNMPConnectionException: Request timed out
at com.vnera.dataproviders.core.common.snmp.SNMPPollingTask.doRun(SNMPPollingTask.java:183) _[dataproviders-0.001-SNAPSHOT.jar:_]

Run the following snmpwalk commands to test the connectivity from the collector to the Cisco ACI:

ubuntu@aria-networks-collector:/$ snmpwalk -v2c -c <community_string> <cisco_aci_ip> 1.3.6.1.2.1.31.1.1.1.6
iso.3.6.1.2.1.31.1.1.1.6 = No Such Object available on this agent at this OID
ubuntu@aria-networks-collector:/$ snmpwalk -v2c -c <community_string> <cisco_aci_ip> 1.3.6.1.2.1.31.1.1.1.1
iso.3.6.1.2.1.31.1.1.1.1 = No Such Object available on this agent at this OID

If the above error 'No Such Object available on this agent at this OID' is seen it indicates SNMP connection is not established.

Resolution

Ensure SNMP is enabled and SNMP traffic is allowed between collector and all the Leaf and Spine switches which is under the Cisco ACI fabric.