Configuring the Spanning Tree Protocol
Configuring Rapid Spanning Tree Settings
Cisco Small Business 300 Series Managed Switch Administration Guide 133
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STEP 4 If a link partner is discovered by using STP, click Activate Protocol Migration to
run a Protocol Migration test. This discovers whether the link partner using STP
still exists, and if so whether it has migrated to RSTP or MSTP. If it still exists as an
STP link, the device continues to communicate with it by using STP. Otherwise, if it
has been migrated to RSTP or MSTP, the device communicates with it using RSTP
or MSTP, respectively.
STEP 5 Select an interface, and click Edit. The Edit Rapid Spanning Tree Page displays.
STEP 6 Enter the parameters
• Interface—Set the interface, and specify the port or LAG where RSTP is to
be configured.
• Point-to-Point Administrative Status—Define the point-to-point link status.
Ports defined as Full Duplex are considered Point-to-Point port links.
- Enable—This port is a RSTP edge port when this feature is enabled, and
brings it to Forwarding mode quickly (usually within 2 seconds).
- Disable—The port is not considered point-to-point for RSTP purposes,
which means that STP works on it at regular speed, as opposed to rapid
speed.
- Auto—Automatically determines switch status by using RSTP BPDUs.
• Point-to-Point Operational Status—Displays the Point-to-Point operating
status if the Point-to-Point Administrative Status is set to Auto.
• Role—Displays the role of the port that has been assigned by STP to
provide STP paths. The possible roles are:
- Root—Lowest cost path to forward packets to the Root Bridge.
- Designated—The interface through which the bridge is connected to the
LAN, that provides the lowest cost path from the LAN to the Root Bridge.
- Alternate—Provides an alternate path to the Root Bridge from the root
interface.
- Backup—Provides a backup path to the designated port path toward the
Spanning Tree leaves. Backup ports occur when two ports are
connected in a loop by a point-to-point link. Backup ports also occur
when a LAN has two or more connections connected to a shared
segment.
- Disabled—The port is not participating in Spanning Tree.
• Mode—Displays the current Spanning Tree mode: Classic STP or RSTP.
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