DELL EMC OPENMANAGE ESSENTIALS (OME) SNMPV3 SUPPORT
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1 DELL EMC OPENMANAGE ESSENTIALS (OME) SNMPV3 SUPPORT SNMPv3 based Discovery/Inventory/Event ABSTRACT This technical white paper explains how to make use of the SNMPv3 protocol for discovery or inventory of DELL EMC devices and how to configure OpenMange Essentials to receive SNMPv3 based traps. As SNMPv3 protocol primarily focused on security aspect and unique identification of agents, OME has introduced new screens to obtain/display the same. This white paper also details about requirements and limitation of SNMPv3 protocol support in the OME. June, 2017 The information in this publication is provided as is. Dell Inc. makes no representations or warranties of any kind with respect to the information in this publication, and specifically disclaims implied warranties of merchantability or fitness for a particular purpose. Use, copying, and distribution of any software described in this publication requires an applicable software license. Copyright June-2017 Dell Inc. or its subsidiaries. All Rights Reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be the property of their respective owners. Published in the USA [6/17/2017] Dell believes the information in this document is accurate as of its publication date. The information is subject to change without notice.
2 CONTENTS EXECUTIVE...3 DISCOVERY/INVENTORY...3 Expected discovery behavior... 4 Authentication model... 4 EVENTS...5 How to enable SNMPv3 events... 5 Capturing the Engine ID... 7 Adding new trap configuration... 9 Editing trap configuration Import and Export trap configurations Deleting the trap configuration TROUBLESHOOTING... 13
3 EXECUTIVE Dell EMC OpenManage Essentials (OME) is a premium one-to-many console from the Dell EMC for monitoring and managing Dell EMC enterprise-class devices. OME supports various protocols for the discovery/inventory of devices including and not limited to SNMPv1/SNMPv2c, WS-Man, WMI, SSH. From OME version 2.3, OME supports SNMPv3 protocol also for discovery/inventory/event. DISCOVERY/INVENTORY For SNMP v3 discovery, new section is added in discovery wizard to enter the credentials required for SNMP v3 discovery. Figure 1 SNMP v3 Discovery wizard By default, SNMPv3 protocol for discovery/inventory is set to Not-Enabled. You have to enable it by selecting Enable SNMP v3 check box in discovery wizard. If user selects SNMPv3, device(s) discovery starts with v3 version, if not supported, discovery will fail. If user has also selected SNMPv1 or SNMPv2c then discovery will be attempted with next immediate lower SNMP version and proceeds. This is because of the secure nature of the protocol.
4 Expected discovery behavior Sl. No. Scenario (Target support) SNMP v1/v2c Selected SNMP v3 Selected Expected Result 1 Only SNMP v3 supported Yes Yes Discovered with SNMP v3 2 Only SNMP v3 supported Yes No Discovery fails 3 Only SNMP v1/v2c supported Yes Yes Discovered with SNMP v2 4 Only SNMP v1/v2c supported No Yes Discovery fails 5 SNMP v1/v2c/v3 supported Yes Yes Discovered with SNMP v3 6 SNMP v1/v2c/v3 supported Yes No Discovered with SNMP v2c Authentication model Following are the modes supported for SNMPv3 authentication Sl. No. Scheme Name Authentication Encryption How to achieve in OME? 1 NoAuthNoPriv No authentication No encryption Select None from Authentication drop down 2 AuthNoPriv Authentication No encryption Select Authentication protocol & select None in Encryption drop down 3 AuthPriv Authentication (SHA1/MD5) Encryption (AES/DES) Select preferred Authentication protocol in drop down and Select preferred encryption protocol in drop down. Protocols supported for Authentication are SHA-1, MD5. Protocols supported for Encryption are AES, DES. Default values provided are SHA1, AES. If customer wants to use different authentication scheme for different devices in the range, customer has to create different discovery ranges.
5 Events SNMPv3 notifications are more secure than SNMPv1 traps SNMPv2 notifications. It requires SNMP Agent Engine ID and SNMP Agent username to receive the trap. It requires encryption passphrase to decode the message. From SNMP v3 specification, Agent must respond with Engine ID as part of discovery process itself. OME store this information and makes use of discovery username and encryption credentials to decode the V3 notifications. In case of Agent(s) not providing valid Engine ID (like idrac 13G), OME will provide option for customer to enter the Engine ID manually (For example, using packet analyzers such as wireshark ). How to enable SNMPv3 events By default, OME uses Windows-based trap listener which supports only SNMPv1 SNMPv2c traps/notifications. To support SNMPv3, OME carries another version of trap listener, which blocks the port, and no other program can acquire the port. To enable SNMPv3 events, change the settings by clicking Settings Alert Settings. Note: This option uses the dedicated SNMP trap reception port for receiving the traps. Other applications in the same box will not be able to receive the traps if they are also configured for the same port. Other applications trying to use the same port may even fail because of port conflict.
6 Figure 2 SNMPv3 - Alert Settings Each SNMPv3 agent has an engine ID that uniquely identifies the agent in the device and also for the unique identification of the MIB objects within a domain. Clock synchronization in the USM security model depends on the concept of an authoritative engine which is identified by the engine ID. In SNMPv3 communication, Engine ID is used as an identifier for an agent among different agents. Expectation is, it should be the same engine ID being used when sending the traps. Majority of the devices including switches, 14G idracs satisfy this expectation. If these devices are discovered using SNMPv3, you need not do any thing special to receive SNMP v3 trap in OME.
7 Scenario Is Engine ID Expectation met? Action to be performed to receive SNMP3 traps Device discovered with SNMP v3 Yes None Device discovered with SNMP v3 No Update Engine id Device discovered with SNMP v1/v2 Yes Update username, credentials Device discovered with SNMP v1/v2 No Update Engine id, user name, credentials idrac discovered with WSMan Yes Update username, credentials idrac discovered with WSMan No Update Engine id, user name, credentials 13G servers, CMC version 5.x do not meet the engine ID expectation. You must capture the engine ID for these devices by using the packet sniffer tools like wireshark. Capturing the Engine ID To capture the engine ID, install a packet sniffer. For this technical white paper, we will be using Wireshark to capture the packet. 1. Install Wireshark and start the Wireshark Network Analyzer. Figure 3 Wireshark homepage
8 2. Double-click Ethernet Interface. 3. Click Apply Display Filter and type snmp, and thenapply the filter. 4. From the source, send the SNMP trap, and you will see msgversion as the SNMPv3 (3) and msgauthoritativeengineid. This is the Engine ID that must be used to decode the SNMP v3 trap.
9 5. After capturing the engine ID, type the engine ID as the IP address and the corresponding encryption/decryption credentials in OME to decrypt the SNMPv3 trap. For this reason, OME provides the following screen under Manage Alert SNMP v3 Trap Configuration. Figure 4 SNMP V3 Trap Configuration Adding new trap configuration 1. Click Add New, to add the new engine ID configuration. The SNMP V3 Trap Configuration dialog box is displayed. Figure 5 Add new SNMP v3 Trap Configuration
10 2. Press OK to populate the data in grid. 3. After typing the information in the fields, click Save to save the changes. Editing trap configuration If you prefer to edit the data that is captured by using discovery/inventory, you can do the inline editing as shown in the screen shot. Figure 6 Editing existing configuration
11 Import and Export trap configurations 1. If you prefer to import these entries from the CSV file, perform the Export operation and modify the contents of the CSV file. 2. Perform the import operation again. This will reduce the chances of header or column missing failures. If you export the data, the following dialog box is displayed: Figure 7 Exporting Data to CSV Exported file will not have details about the authentication password, encryption password. These columns are left blank intentionally for security reasons. Else, you can create the CSV file on your own with the following headers. Agent IP Address Engine ID Username Authentication Protocol Authentication Password Encryption Protocol Encryption Password Note: In this CSV, you have to enter the authentication and encryption passwords in plain text. After you import this CSV into OME, it is advised to delete the file, or keep in a folder where no one else can access it.
12 CSV will look like the following after entering the details: Agent IP Address Engine ID Username Authentication Protocol Authentication Password Encryption Protocol Encryption Password x snmpv3user SHA1 somepassword AES somepassword x snmpv3user SHA1 somepassword AES somepassword x snmpv3user SHA1 somepassword AES somepassword 1. Click Import. The Open dialog box is displayed. Select a file and click Open. Figure 8 Import CSV dialog Note: With this import, you can add only the configuration. You cannot delete or edit the existing configuration data. In case if you attempt to edit the existing data, an error occurs. After successfully importing, a message is displayed as shown in the screen shot. Figure 9 CSV import successful 2. After importing, click Save.
13 Deleting the trap configuration 1. To delete the configuration, select the configuration and click Delete. A message is displayed as shown in the screen shot. Figure 10 Delete warning Troubleshooting Issue 1: After discovery with SNMPv3, Engine ID is not shown on the SNMPv3 Configuration page. Solution: Engine ID is discovered from the following SNMP OID Perform an SNMP get or walk operation to ensure the availability of the mentioned OID. Issue 2: After discovering a device with SNMPv3, OME is not receiving SNMPv3 trap from the device. Solution: Check the following in sequence to ensure the proper setup: 1. Check whether or not the SNMPv3 trap listener is enabled in settings page. 2. Ensure Windows SNMP Trap service is stopped in the OME system. 3. Ensure port number for trap given in SNMP v3 trap listener is correct. 4. Ensure Firewall rules allow SNMP trap to OME server. 5. Check whether or not you are receiving the trap in OME system by using Wireshark or any other packet analyzer tool. 6. Check whether the engine ID shown for the device is same as the Authoritative Engine id received in wirewireshark by clicking Manage Alerts SNMP v3 Alert configuration. 7. Check the username listed in SNMP v3 Alert Configuration. 8. Check the Authentication and Encryption algorithms listed in SNMP v3 Alert Configuration. 9. Ensure the passwords entered are correct. Issue 3: After the discovery of device with SNMPv3, SNMP Trap Configuration page still displays the message: Please Enter user name. Solution: This has happened because of the selection of WS-Man protocol at the time of SNMP discovery. Credentials of WS-Man takes precedence. Edit the discovery range and remove WS-Man protocol, or create new discovery range only with SNMP. Issue 4: After the discovery of 13G idrac by using SNMPv3, traps are not received in the OME. Solution: This is happening because the discovery engine ID and the authoritative engine ID are different in 13G firmware. You need to capture the authoritative engine ID from the trap by using the Wireshark and enter on the SNMP Trap Configuration page.
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