Port Roles
The following table contains the port roles for RSTP:
|
|
Root |
Provides the best path to the root. This
is the port that receives the best BPDU on a bridge. |
Designated |
Can send the best BPDU on a segment to which
it is connected. Bridges connected to a given segment listen to
the BPDUs of other bridges and agree on the bridge sending the best
BPDU as the designated bridge for that segment and the port as the
designated port. |
Alternate |
Blocked because another port on the bridge received
superior information from another bridge. This port corresponds
to the blocking state of 802.1w. |
Back-up |
Blocked because another port received superior
information from the same bridge. This port also corresponds to
the blocking state of 802.1w. |
|
A port with the root or a designated port role is included
in the active topology. A port with the alternate or backup port
is excluded from the active topology.