D-Link xStack Reference Manual page 307

xStack® DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch CLI Reference Guide
* Use the local database to authenticate the client. The switch will resort to using the local
database to authenticate the client. If the client fails on local authentication, the client is regarded
as un-authenticated, otherwise, it authenticated.
* Pass authentication. The client is always regarded as authenticated. If guest VLAN is enabled,
clients will stay on the guest VLAN, otherwise, they will stay on the original VLAN.
* Block the client (default setting). The client is always regarded as un-authenticated.
Format
config authentication server failover [local | permit | block]
Parameters
local - Specifies to use the local database to authenticate the client.
permit - Specifies that the client is always regarded as authenticated.
block - Specifies to block the client. This is the default setting.
Restrictions
Only Administrator, Operator and Power-User level users can issue this command.
Example
To set the authentication server failover state:
DGS-3620-28SC:admin#config authentication server failover local
Command: config authentication server failover local
Success.
DGS-3620-28SC:admin#
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