Network device discovery settings

Important

This version of Operations Manager has reached the end of support. We recommend you to upgrade to Operations Manager 2022.

System Center Operations Manager offers many settings that you can use to configure discovery of network devices. The following table explains the available settings and how to configure them in the Network Devices Discovery Wizard.

Setting	Location	Notes
Name or IP address	Devices page, Add button	Enter either a fully qualified domain name (FQDN) or an IPv4 address. Operations Manager can identify connected devices in a recursive discovery that use an IPv6 address; however, the initial device that is discovered must use an IPv4 address.
Access mode	Devices page, Add button	Select either ICMP and SNMP, ICMP, or SNMP. This specifies the protocol that will be used for both discovery and monitoring. If you select ICMP and SNMP, the device must be accessible by both protocols, or discovery will fail.
SNMP version	Devices page, Add button	Select either v1 or v2 or v3. SNMP v1 and v2 devices can use the same Run As account. SNMP v3 devices require a different format Run As account.
Port number	Devices page, Add button	The default port is 161. You can change this value if you're discovering a network device that uses another port.
Run As account	Devices page, Add button	The available accounts in the menu are populated based on your selection in the SNMP version box. You can create the appropriate Run As account by selecting Add SNMPversionRun As Account.
Number of retry attempts	Devices page, Advanced Discovery Settings button	This setting specifies how many times the management server should attempt to contact the network device before reporting that discovery failed.
ICMP time-out (in milliseconds)	Devices page, Advanced Discovery Settings button	If you specify ICMP and SNMP or ICMP for Access mode, the management server attempts to contact the network device by using ping. The default setting is 1500 milliseconds (1.5 seconds).
SNMP time-out (in milliseconds)	Devices page, Advanced Discovery Settings button	If you specify ICMP and SNMP or SNMP for Access mode, the management server attempts to contact the network device by using SNMP. The default setting is 1500 milliseconds (1.5 seconds).
Maximum number of devices to discover	Devices page, Advanced Discovery Settings button	This setting applies during recursive discovery and sets a limit on the number of devices to discover. The default is 1500. If you know you're going to discovery more than 1500 devices, you must change this setting.
IP address range	Include Filters page, Add button, when configuring a recursive discovery rule	Use this field to limit the recursive discovery to IP addresses that meet the specified criteria. This field uses a wildcard format. For example, if you enter 192.168.1., the discovery rule discovers devices that use any IP address between 192.168.1.1 and 192.168.1.255. If you enter 192.168.1.<1-140>, the discovery rule discovers devices that use any IP address between 192.168.1 and 192.168.140.
Included device types	Include Filters page, Add button, when configuring a recursive discovery rule	Any devices that you select are included in the recursive discovery. Clear the selection for any type of device that you don't want discovered.
Include only network devices with the following system attributes (OIDs) - Name	Include Filters page, Add button, when configuring a recursive discovery rule	If you enter a value here, only devices with a matching name are discovered. This field allows a wildcard format.
Include only network devices with the following system attributes (OIDs) - Object ID (OID)	Include Filters page, Add button, when configuring a recursive discovery rule	If you enter a value here, only devices with a matching OID are discovered. This field allows a wildcard format.
Include only network devices with the following system attributes (OIDs) - Description	Include Filters page, Add button, when configuring a recursive discovery rule	If you enter a value here, only devices with a matching description are discovered. This field allows a wildcard format.
IP Address or Host Name	Exclude Filters page, Add button, when configuring a recursive discovery rule	Enter either a fully qualified domain name (FQDN), an IPv4 address, or an IPv6 address to exclude from discovery. You can add multiple IP address individually.

Wildcard matching for IP address range

Wildcard pattern matching is done from left to right, one character or basic wildcard pattern at a time. The pattern and the incoming string must match exactly. So, for example, the pattern abc doesn't match the string abcd. Compound patterns consist of basic patterns separated by an ampersand (&) or a tilde (~). If the first character of a compound pattern is an ampersand or tilde, it's interpreted as if there were an asterisk at the beginning. For example, the pattern ~[0-9] matches any string that doesn't contain a digit. A trailing ampersand can only match an empty string, and a trailing tilde indicates except for an empty string.

Spaces are significant characters and are subject to matching.

The wildcard patterns consist of the following.

Character	Description	Example
?	Matches any single character	Example?.com matches Example1.com and Example2.com, but not Example01.com
*	Matches zero or more characters	Example*.com matches example.com, example1.com, and examplereallylong.com
[set]	Matches any single character in set, or if the first character ^, it matches any character not in set. A hyphen indicates a range. A caret (^) not in the first position, and a hyphen in the first or last position has no special meaning.	Ex[abc]mple matches Example, Exbmple, and Excmple. Ex[^abc]mple doesn't match Example, Exbmple, and Excmple, but does match ExZmple Ex[0-9] matches Ex followed by a single digit.
<n1-n2>	Matches any integer greater than or equal to the non-negative n1 and less than or equal to the non-negative n2. Omitting n1 or n2 indicates no bound	10.193.220.<1-25> matches all IP addresses between 10.193.220.1 and 10.193.220.25 inclusive. <10-> matches any string of digits greater than or equal to 10. <1-10>* Matches any number between 1 and 10 with an option following character such as 1, 20x, 5z, but it doesn't match 11 since that isn't a number between 1 and 10.
|	Alternative matches	AB|DC matches either AB or DC ABC| matches either ABC or an empty string
|Escape character
\|Escape character for (,), [,], <, and >	\\(A\\) matches (A)
&	And also	*NY*ROUTER matches all strings containing NY and ROUTER <1-100>&*[02468] matches all even numbers between 1 and 100. *A*|*B*&*C* matches strings that contain either an A or a B, and also a C.
~	Except	10.20.30.*~10.20.30.50 matches all hosts on 10.20.30 except for 10.20.30.50. *Router*~*Cisco*&*10.20.30.<5-10> matches routers except Cisco routers with the addresses between 10.20.30.5 and 10.20.30.10.

Configuring a VLAN tag

To differentiate between VLANs, you can configure a tag for a virtual local area network (VLAN) by editing the vlan-tag-settings.conf file on each management server that runs a network discovery rule. Vlan-tag-settings.conf is located in the Operations Manager installation directory in \Server\NetworkMonitoring\conf\discovery.

To configure a VLAN tag

1. On each management server that runs a network discovery rule, open vlan-tag-settings.conf in a text editor.

2. Add the following text to the file. You can use wildcard matching.

   config name
   match Type type
   match Description text to match
   settings VLAN_Provisioning_Setting
   param Tag tag name
   

3. Save vlan-tag-settings.conf.

The following is an example of the configuration of a VLAN tag LDSwitch to be used for all switches that have a description that starts with Cisco:

config LanceSwitch
match Type SWITCH
match Description Cisco*
settings VLAN_Provisioning_Setting
param Tag LDSwitch