Netscaler SNMP Polling and Traps

Netscaler SNMP Polling and Traps

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Article ID: CTX227493

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Description

SNMP Polling:

You can query the NetScaler SNMP agent for system-specific information from a remote device called SNMP managers. The agent then searches the management information base (MIB) for the data requested and sends the data to the SNMP manager.
MIBs describe the structure of the management data of a device subsystem; they use a hierarchical namespace containing object identifiers (OID). Each OID identifies a variable that can be read or set via SNMP
SNMP Queries supported by NetScaler SNMP agent:
  • GET
  • GET NEXT
  • GET BULK
Optimized version of GetNextRequest. A manager-to-agent request for multiple iterations of GetNextRequest. Returns a Response with multiple variable bindings walked from the variable binding or bindings in the request
 
  • ALL
 
You can create strings called community strings and associate each of these to query types

SNMP Traps -NetScaler

The traps are events which are generated whenever there are abnormal conditions on the appliance.
The traps are sent to a remote device called a trap listener.
The NetScaler appliance provides a set of condition entities called SNMP alarms. When the condition in any SNMP alarm is met, the appliance generates SNMP trap messages that are sent to the configured trap listeners.
SNMP version 3 traps are supported from 10.5 version onwards.

Generic Traps

These are the pre-defined traps and are implemented by most of the agents. Six Generic traps are defined as follows:
  1. Cold Start – This trap indicates that sending device is re-initializing itself such that the agent’s configuration may be altered.
  2. Warm Start – This trap indicates that sending device is re-initializing itself such that the agent’s configuration is not altered.
  3. Link Down – This trap indicates an interface has gone from up state to down state. The first variable in variable bindings identifies the interface.
  4. Link Up – This trap indicates an interface has changed to up state. The first variable in variable bindings identifies the interface.
  5. Authentication Failure – This trap indicates an SNMP message has been received which failed authentication e.g. a bad community name.
  6. EgpNeighbour Loss – This trap indicates and EGP neighbor has transitioned to down state. First variable has IP address of EGP neighbor.
 

Specific Traps:

They are vendor specific.

Port Specifications:

- SNMP traps are sent to Destination UDP port 162
- SNMP queries are sent to UDP port 161 from the server to the NetScaler
 

MIB Browser :

A MIB Browser is a tool that allows you to pull out data from SNMP enabled devices 
 

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