Linksys SRW208MP, SRW208L, SRW208G manual Spanning Tree Mstp Properties, Established by the device

Chapter 5 Advanced Configuration

network topologies that allow a faster STP convergence without creating forwarding loops.

Interface  Displays the port or LAG on which Rapid STP is enabled.

Role  Indicates the port role assigned by the STP algorithm in order to provide to STP paths. The possible field values are:

•• Root  Provides the lowest cost path to forward packets to root switch.

•• Designated  Indicates that the port or LAG via 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. Backup ports also occur when a LAN has two or more connections connected to a shared segment.

•• Disabled  Indicates the port is not participating in the Spanning Tree.

Mode  Indicates the current Spanning Tree mode. The Spanning Tree mode is selected in the Global STP screen. The possible field values are:

•• Classic 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  Indicates if 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.

Port State  Indicates if RSTP is enabled on the interface.

Point-to-Point Admin Status  Indicates if a point-to-point links are established, or permits the device to establish a point-to-point link. The possible field values are:

•• Auto  Point-to-point	links	are	automatically
established by the device.

•• Enabled  Enables the device to establish a point-to- point link. To establish communications over a point- to-point link, the originating PPP first sends Link Control Protocol (LCP) packets to configure 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 Protocols (NCP) packets to select and configure one or more network layer protocols. When each of the chosen network

layer protocols has been configured, packets from each network layer protocol can be sent over the link. The link remains configured 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.

•• Disabled  Disables point-to-point link.

Point-to-Point Oper Status  Indicates the Point-to-Point operating state.

To run a migration test, press Activate next to the Activate Protocol Migration Test field. The test sends Link Control Protocol (LCP) packets to test if a data link is enabled.

Spanning Tree > MSTP Properties

Spanning Tree > MSTP Properties

MSTP provides differing load balancing scenarios. For example, while port A is blocked in one STP instance, the same port is placed in the Forwarding State in another STP instance. The MSTP Properties screen contains information for defining global MSTP settings, including region names, MSTP revisions, and maximum hops.

The MSTP Properties screen contains the following fields: Region Name  Provides a user-defined STP region name.

Revision  Defines unsigned 16-bit number that identifies the revision of the current MST configuration. The revision number is required as part of the MST configuration. The possible field range 0-65535.

Max Hops  Indicates the total number of hops that occur in a specific region before the BPDU is discarded. Once the BPDU is discarded, the port information is aged out. The possible field range is 1-40. The field default is 20 hops.

IST Master  Identifies the Spanning Tree Master instance. The IST Master is the specified instance root.

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