OS6860(E)_AOS_8.1.1.R01_Switch_Management_Guide

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Using SNMP For Switch Security Using SNMP Encryption and Authentication (SNMPv3) Two important processes are used to verify that the message contents have not been altered and that the source of the message is authentic. These processes are encryption and authentication. A typical data encryption process requires an encryption algorithm on both ends of the transmission and a secret key (like a code or a password). The sending device encrypts or “scrambles” the message by running it through an encryption algorithm along with the key. The message is then transmitted over the network in its encrypted state. The receiving device then takes the transmitted message and “un-scrambles” it by running it through a decryption algorithm. The receiving device cannot un-scramble the coded message without the key. The switch uses the Data Encryption Standard (DES) encryption scheme in its SNMPv3 implementation. For DES, the data is encrypted in 64-bit blocks by using a 56-bit key. The algorithm transforms a 64-bit input into a 64-bit output. The same steps with the same key are used to reverse the encryption. The authentication process ensures that the switch receives accurate messages from authorized sources. Authentication is accomplished between the switch and the SNMP management station through the use of a username and password identified via the snmp station CLI syntax. The username and password are used by the SNMP management station along with an authentication algorithm (SHA or MD5) to compute a hash that is transmitted in the PDU. The switch receives the PDU and computes the hash to verify that the management station knows the password. The switch will also verify the checksum contained in the PDU. Authentication and encryption are combined when the PDU is first authenticated by either the SHA or MD5 method. Then the message is encrypted using the DES encryption scheme. The encryption key is derived from the authentication key, which is used to decrypt the PDU on the switch’s side. Configuring Encryption and Authentication Setting Authentication for a User Account User account names and passwords must be a minimum of 8 characters in length when authentication and encryption are used. The following syntax sets authentication type MD5 with DES encryption for user account “user_auth1”. -> user user_auth1 password ******** md5+des SNMP authentication types SHA and MD5 are available with and without type DES encryption. The sha, md5, sha+des, and md5+des keywords may be used in the command syntax. Note. Optional. To verify the authentication and encryption type for the user, enter the show user command. The following is a partial display. -> show user User name = user_auth1 Read right = 0x0000a200 0x00000000, Write right = 0x00000000 0x00000000, Read for domains = , Read for families = snmp chassis interface , Write for domains = None , Snmp authentication = MD5, Snmp encryption = DES The user’s SNMP authentication is shown as MD5 and SNMP encryption is shown as DES. page 9-10 OmniSwitch AOS Release 8 Switch Management Guide May 2014
Using SNMP Using SNMP For Switch Security Setting SNMP Security By default, the switch is set to “privacy all”, which means the switch accepts only authenticated and encrypted v3 Sets, Gets, and Get-Nexts. You can configure different levels of SNMP security by entering snmp security followed by the command parameter for the desired security level. For example, the following syntax sets the SNMP security level as “authentication all” as defined in the table below: -> snmp security authentication all The command parameters shown in the following table define security from the lowest level (no security) to the highest level (traps only) as shown. Security Level no security authentication set authentication all privacy set privacy all traps only SNMP requests accepted by the switch All SNMP requests are accepted. SNMPv1, v2 Gets Non-authenticated v3 Gets and Get-Nexts Authenticated v3 Sets, Gets, and Get-Nexts Encrypted v3 Sets, Gets, and Get-Nexts Authenticated v3 Sets, Gets, and Get-Nexts Encrypted v3 Sets, Gets, and Get-Nexts Authenticated v3 Gets and Get-Nexts Encrypted v3 Sets, Gets, and Get-Nexts Encrypted v3 Sets, Gets, and Get-Nexts All SNMP requests are rejected. OmniSwitch AOS Release 8 Switch Management Guide May 2014 page 9-11
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Part No. 060391-10, Rev. A May 2014
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Contents About This Guide .........
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Contents Using the Switch as an FTP
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Contents Account and Password Polic
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Contents Authentication Trap ......
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Contents Firmware Upgrade Files ...
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About This Guide This OmniSwitch AO
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About This Guide Documentation Road
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About This Guide Related Documentat
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1 Logging Into the Switch Logging i
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Logging Into the Switch Quick Steps
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Logging Into the Switch Overview of
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Logging Into the Switch Accessing t
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Logging Into the Switch Setting the
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Logging Into the Switch Using Secur
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Logging Into the Switch Modifying t
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Logging Into the Switch Enabling th
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Logging Into the Switch Enabling th
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2 Managing System Files This chapte
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Managing System Files Switch Admini
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Managing System Files File and Dire
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Managing System Files Loading Softw
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Managing System Files Loading Softw
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Managing System Files Setting the S
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Managing System Files Setting the S
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3 Managing CMM Directory Content Th
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Managing CMM Directory Content CMM
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Managing CMM Directory Content Mana
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Managing CMM Directory Content Usin
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4 Using the CLI Alcatel-Lucent’s
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Using the CLI Command Entry Rules a
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Using the CLI Command Help -> sh vl
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Using the CLI Logging CLI Commands
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Using the CLI Customizing the Scree
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5 Working With Configuration Files
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Working With Configuration Files Tu
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Working With Configuration Files Qu
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Working With Configuration Files Co
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Page 119 and 120: 7 Managing Switch Security Switch s
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Page 125 and 126: Managing Switch Security Quick Step
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Page 131 and 132: 8 Using WebView The switch can be m
Page 133 and 134: Using WebView WebView CLI Commands
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Page 137 and 138: 9 Using SNMP The Simple Network Man
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Managing Automatic Remote Configura
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13 Configuring Virtual Chassis A Vi
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Configuring Virtual Chassis Virtual
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Configuring Virtual Chassis Quick S
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Configuring Virtual Chassis Managin
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Configuring Virtual Chassis Managin
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Configuring Virtual Chassis Interac
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Configuring Virtual Chassis Configu
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Configuring Virtual Chassis Configu
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Configuring Virtual Chassis Display
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A Software License and Copyright St
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Alcatel-Lucent License Agreement Al
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B SNMP Trap Information This append
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SNMP Traps Table No. Trap Name Obje
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Index Symbols !! command 4-6 A aaa
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Index Network Time Protocol see NTP
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OS6860(E)_AOS_8.1.1.R01_Switch_Management_Guide

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