Users Guide

635| RSTP Dell Networking W-Series ArubaOS 6.5.x| User Guide
STP (802.1d)
Port State
RSTP (802.1w)
Port State
Disabled Discarding
Blocking Discarding
Listening Discarding
Learning Learning
Forwarding Forwarding
Table 136: Port State Comparison
In addition to port state, RSTP introduces port roles for all the interfaces (see Table 137).
RSTP (802.1w)
Port Role
Description
Root The port that receives the best BPDU on a bridge.
Designated The port can send the best BPDU on the segment to which it is connected.
Alternate The port offers an alternate path, in the direction of root bridge, to that provided by
bridge’s root port.
Backup The port acts as a backup for the path provided by a designated port in the direction
of the spanning tree.
Table 137: Port Role Descriptions
To view the RSTP output, including state and port roles, enter the following command in the CLI:
(host) (config) #show spantree
The show spanning-tree interface command also indicates the state and port roles. See the example below
for a partial output:
(host) #show spanning-tree interface fastethernet 1/1
Interface FE 1/7 (port 8) in Spanning tree is FORWARDING
Port path cost 19, Port priority 128 Role DESIGNATED
Edge Port and Point-to-Point
At the interface level, the portfast command specifies an interface as an edge port, and the point-to-point
command specifies an interface as a point-to-point link. Since RSTP is enabled by default, all the interfaces are
point-to-point links by default.
Configuring RSTP
Use either the CLI or the WebUI to configure RSTP.