Cisco SRW2024P User Guide - Page 54

Chapter 5 Advanced Configuration •• 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 (configurable from Spanning Tree > STP Port Settings). 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 Enables automatic establishment of point-topoint links. •• Enabled Enables the device to establish a point-topoint link. To establish communications over a pointto-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. Activate Protocol Migration Test This option sends Link Control Protocol (LCP) packets to test if a data link is enabled. Spanning Tree > MSTP Properties Multiple Spanning Tree Protocol (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. Spanning Tree > MSTP Properties 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 0-65,535. 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. WebView Switches 47