Figure 3.14 Port role definition in RSTP.
When a failure appears on a network, an alternative path will be selected and port roles will be
changed. Please take a look to a picture below:
Figure 3.15 Change of Port role upon network failure.
ONLY PORTS WITH ROOT AND DESIGNATED ROLES WILL FORWARD
DATA PACKETS. PORTS WITH ALTERNATIVE ROLE WILL BE IN
BLOCKED STATE
3.2.2.9 RADIUS
The RADIUS (Remote Authentication in Dial-In User Service) is used to authenticate and
authorise remote devices from the single place. Unlike the local authentication and authorisation,
where USERNAME/PASSWORD/ACCESS_RIGHTS have to be created for every single unit in
the network, the RADIUS authentication and authorisation means that user credentials must be
created and stored only once on the RADIUS server. The remote RADIUS clients will connect to
the RADIUS server and request user authentication and authorisation.
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