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Chapter 5: Using the Web-based Utility for Configuration
Spanning Tree Tab - MSTP Properties
WebView Switches
• 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.
Activate Protocol Migration Test. This option sends Link Control Protocol (LCP) packets to test if a data link is
enabled.
Spanning Tree Tab - 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.
Figure 5-49: Spanning Tree - MSTP Properties