24-Port Managed Gigabit Switch
7. Edge Port
The edge port is a designation used for a port that is directly
connected to end stations where bridging loops cannot be created in
the network. Therefore, the edge port directly transitions to the
forwarding state, and skips the listening and learning stages. Edge
ports generate topology changes when the link toggles. So an edge
port that receives a BPDU immediately loses edge port status and
becomes a normal spanning tree port. At this point, there is a
user-configured value and an operational value for the edge port state.
8. P2P Port
RSTP can only achieve rapid transition to the forwarding state on
edge ports and on point-to-point links. The link type is automatically
derived from the duplex mode of a port. A port that operates in
full-duplex is assumed to be point-to-point, while a half-duplex port
is considered as a shared port by default. This automatic link type
setting can be overridden by explicit configuration. In switched
networks today, most links operate in full-duplex mode and are
treated as point-to-point links by RSTP. This makes them
candidates for rapid transition to the forwarding state.
9. Port Transition States
The important differences between the three protocols are in the
way ports transition to a forwarding state and in the way this
transition relates to the role of the port (forwarding or not forwarding)
in the network topology. There are only three port states left in
RSTP that correspond to the three possible operational states. The
34
To Next Page
Loading...
Need help?
General
