Unlike the 802.1D standard, RSTP defines only three distinct port states for a port under STP control. Table 4-1 below lists these three states, compares them to the port states defined in the 802.1D standard, and provides a brief description of their behavior:
Table 4-1. Comparison between 802.1D and 802.1w Port States
802.1D State
802.1w State
Default Port Operational Status
Port in Active Topology?
Port Learning MAC Addresses?
Disabled
Discarding
Enabled
No
No
Blocking
Discarding
Enabled
No
No
Listening
Discarding
Enabled
Yes
No
Learning
Learning
Enabled
Yes
Yes
Forwarding
Forwarding . . .
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