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9.2 Conguring the Rapid STP
While Classic STP prevents Layer 2 forwarding loops in a general network topology, convergence can take between 30-60
seconds. This time may delay detecting possible loops and propagating status topology changes. Rapid Spanning Tree
Protocol (RSTP) detects and uses network topologies that allow a faster STP convergence without creating forwarding
loops. The Global System LAG information displays the same eld information as the ports, but represent the LAG RSTP
information.
To view and dene RSTP:
1. Click System > Bridging Info > Spanning Tree > RSTP. The RSTP Page opens:
Figure 87: RSTP Page
The RSTP Page contains the following elds:
Interface — Displays the port or LAG on which Rapid
STP is enabled.
Role — Displays the port role assigned by the STP
algorithm to provide to STP paths.
The possible eld values are:
– Root — Provides the lowest cost path to forward
packets to the root switch.
– Designated — Indicates the port or LAG through
which the designated switch is attached to the LAN.
– Alternate — Provides an alternate path to the root
switch from the root interface.
– Backup — Provides a backup path to the designated port path toward the Spanning Tree leaves. Backup ports occur
only when two ports are connected in a loop by a point-to-point link, or when a LAN has two or more connections
connected to a shared segment.
– Disabled — Indicates that the port is not participating in the Spanning Tree.
Mode — Displays the current STP mode. The STP mode is selected in the STP Properties Page.
The possible eld values are:
– STP — Indicates that Classic STP is enabled on the device.
– Rapid STP — Indicates that Rapid STP is enabled on the device.
– Multiple STP — Indicates that Multiple STP is enabled on the device.
Fast Link Operational Status — Indicates whether Fast Link is enabled or disabled for the port or LAG. If Fast Link is
enabled for a port, the port is automatically placed in the forwarding state.
Point-to-Point Admin Status — Indicates whether a point-to-point link is established, or if the device is permitted to
establish a point-to-point link. The possible eld values are:
– Enable — The device is permitted to establish a point-to-point link, or is congured to automatically establish a point-to-
point link. To establish communications over a point-to-point link, the originating PPP rst sends Link Control Protocol
(LCP) packets to congure and test the data link. After a link is established and optional facilities are negotiated as
needed by the LCP, the originating PPP sends Network Control Protocol (NCP) packets to select and congure one
or more network layer protocols. When each of the chosen network layer protocols has been congured, packets from
each network layer protocol can be sent over the link. The link remains congured for communications until explicit
LCP or NCP packets close the link, or until some external event occurs. This is the actual switch port link type. It may
differ from the administrative state.
– Disable — Disables point-to-point link.
– Auto — Enables a point-to-point link automatically.