Discovery times out while discovering the bridge MIB or the Network Aggregation Group

Products

• VMware Smart Assurance
• VMware Telco Cloud Service Assurance

Issue/Introduction

This article explains the workaround for following symptoms observed in Smarts:

• Discovery times out while discovering the bridge MIB or the Network Aggregation Group.
• IP DiscoveryError shows timeout error on request for Bridge MIB OID .1.3.6.1.2.1.17.
• Cannot discover connections between devices in the VMWare Smart Assurance IP Availability Manager.

Environment

SMARTS-10.1.x

SMARTS DM - 2.x

TCSA - 2.x

Cause

• MIB readonly community string does contains "@" characters. For Cisco devices, the @ symbol tells the SNMP agent that everything after the "@" symbol is a "context". 
• This is typically used to query a specific VLAN for bridging information, and would look something like this for example: public@vlan2222
• The above would return information regarding VLAN 2222 using the community string "public".

Resolution

• Check to ensure that the readonly community string does not contain any "@" characters. 
• See the following : https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mcl/allreleasemcl/all-book.html  article on the Cisco website for more information.
• Look in the section entitled, "snmp-server community":