never seen this before
here is the example :
Configuring Global Preshared Keys
You can configure preshared keys at the global level for all servers used by the Nexus 5000 Series switch. A preshared key is a shared secret text string between the Nexus 5000 Series switch and the RADIUS server hosts.
To configure global preshared keys, obtain the preshared key values for the remote RADIUS servers and perform this task:
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Step 1
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switch# configure terminal
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Enters configuration mode.
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Step 2
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switch(config)# radius-server key [ 0 | 7 ] key-value
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Specifies a preshared key for all RADIUS servers. You can specify a clear text (0) or encrypted (7) preshared key. The default format is clear text. The maximum length is 63 characters.
By default, no preshared key is configured.
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Step 3
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switch(config)# exit
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Exits configuration mode.
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Step 4
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switch# show radius-server
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(Optional) Displays the RADIUS server configuration.
Note The preshared keys are saved in encrypted form in the running configuration. Use the show running-config command to display the encrypted preshared keys.
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Step 5
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switch# copy running-config startup-config
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(Optional) Copies the running configuration to the startup configuration.
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