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Chapter 25 Spanning Tree Protocol
IES-1248-51V User’s Guide
203
RSTP assigns three port states to eliminate packet looping while STP assigns five
(see Table 51 on page 203). A device port is not allowed to go directly from
blocking state to forwarding state so as to eliminate transient loops.
See the IEEE 802.1w standard for more information on RSTP. See the IEEE 802.1D
standard for more information on STP.
Table 51 RSTP Port States
RSTP PORT STATE STP PORT STATE DESCRIPTION
Discarding Disabled RSTP or STP is disabled (default).
Discarding Blocking In RSTP, BPDUs are discarded.
In STP, only configuration and
management BPDUs are received and
processed.
Discarding Listening In RSTP, BPDUs are discarded.
In STP, all BPDUs are received and
processed.
Learning Learning All BPDUs are received and processed.
Information frames are submitted to the
learning process but not forwarded.
Forwarding Forwarding All BPDUs are received and processed. All
information frames are received and
forwarded.
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