Hyperglance can automatically discover your network estate using its SNMP Discovery function.


Features include:

  • Auto-discover your SNMP devices & their connections.
  • Schedule periodic re-discoveries to keep everything up-to-date.
  • Supports SNMP v1, v2 & v3
  • Control the amount of SNMP and ICMP traffic on your network during automatic discoveries.
  • Automatically monitors SNMP performance metrics on devices & interfaces once they are discovered.


To Setup SNMP Discovery:


From the admin panel ( https://IPADDRESS:8443/#/admin ) click on the SNMP Discovery tab


The first time you view this page you will be given a configuration form to setup the discovery. It is divided into sections. Complete each section below and click the Save button.


The DISCOVERY section:

This section lets you configure what gets discovered.


Field
Description
Included Subnets
Enter any IP addresses you wish to discover or subnets (in slash-notation form:  x.x.x.x/y) that you wish to scan through.

Note: Large subnet ranges may take a lot of time, scanning multiple smaller subnet ranges will scan faster!
Excluded Subnets
Enter any IP addresses or subnets that you wish to explicitly not discover.
Max Hops
Will expand hop-by-hop to find additional connected devices beyond those found from the included subnets/IPs.

For example a value of 4 will discover devices that are up to 4 hops outwards from any devices that were initially found in the scan.
DNSLookup
Should Hyperglance do DNS lookups. There are times when a site’s DNS is very slow and doing DNS lookups can have an extremely adverse effect on the speed of discovery.



The AUTHENTICATION section:

This section lets you configure SNMP access to your devices (community strings and SNMPv3 credentials).


Field
Description
Communities
Enter SNMP community strings required to access devices. If multiple are entered they will be tried in-order until one succeeds.
V3 Credentials
This is only needed if you have any devices that require SNMPv3.
Enter the relevant parts of the V3 credential:
If any of the fields don't apply simply leave them blank.
The validation requires that proceed through the form fields in the right order (start with username, then the context-name, then the auth dropdown, then the auth-password, then the priv-password).
Click the tick mark once you have entered a credential.



The PERFORMANCE section:

This section lets you control how much ICMP and SNMP traffic is on your network during a discovery and how aggressively (or not) your devices are inspected.

We have set cautiously slow defaults will result in a slower discovery. In particular may will decrease the SNMP and Ping delays to speed up discovery.



Field
Description
SNMP Timeout Increment
How much to increase the SNMP timeout by (in milliseconds) per retry on a single IP.
SNMP Delay (Ms)
How much delay between SNMP calls. 200 is a cautious default (5 calls per second) and you may wish to decrease this value.
SNMP Retries
How many retries to attempt on a single IP for SNMP data collection.
Ping Delay (Ms)
How much delay between pings. 200 is a cautious default (5 ping per second) and you may wish to decrease this value.
Ping Retries
How many ping retries to attempt on a single IP.



The DEBUGGING section:

You should leave this section blank unless instructed otherwise by Hyperglance support.

This is a tool to help with diagnosing SNMP Discovery issues on troublesome or unusual devices. Hyperglance will perform a MIB dump on any IP addresses entered here.

It is unnecessary and slow to perform this during normal operation.



Run a Discovery

Having configured your discovery settings you can now run a discovery by clicking the Network Discovery button:


Note: The icon will spin until discovery completes.

Note: The Topology view will only update once discovery has completed.


If the result isn't what you hoped and you need to tweak the configuration simply click the Edit button to go back and adjust the settings:



Setup Scheduled Re-Discovery

To keep your topology and device monitoring up-to-date with a changing network you can have the discovery to auto-run on a schedule. See Scheduling SNMP Discoveries.