D-Link DES-3326SR, User Manual

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DES-3326SR Layer 3 Fast Ethernet Switch User’s Guide
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Listening Discarding No No
Learning Learning No Yes
Forwarding Forwarding Yes Yes
Table 5-5. Comparing Port States
RSTP is capable of more rapid transition to a forwarding state –
it no longer relies on timer configurations – RSTP compliant
bridges are sensitive to feedback from other RSTP compliant
bridge links. Ports do not need to wait for the topology to
stabilize before transitioning to a forwarding state. In order to
allow this rapid transition, the protocol introduces two new
variables: the edge port and the point-to-point (P2P) port.
Edge Port
The edge port is a configurable designation used for a port that
is directly connected to a segment where a loop cannot be
created. An example would be a port connected directly to a
single workstation. Ports that are designated as edge ports,
transition to a forwarding state immediately without going
through the listening and learning states. An edge port loses its
status if it receives a BPDU packet, immediately becoming a
normal spanning tree port.
P2P Port
A P2P port is also capable of rapid transition. P2P ports may be
used to connect to other bridges. Under RSTP, all ports
operating in full-duplex mode are considered to be P2P ports,
unless manually overridden through configuration.