Cisco WS-C2960-24TC-S Software Guide - Page 338
Configuring MSTP Features, Default MSTP Configuration
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Configuring MSTP Features Chapter 16 Configuring MSTP • Propagation-When an RSTP switch receives a TC message from another switch through a designated or root port, it propagates the change to all of its nonedge, designated ports and to the root port (excluding the port on which it is received). The switch starts the TC-while timer for all such ports and flushes the information learned on them. • Protocol migration-For backward compatibility with IEEE 802.1D switches, RSTP selectively sends IEEE 802.1D configuration BPDUs and TCN BPDUs on a per-port basis. When a port is initialized, the migrate-delay timer is started (specifies the minimum time during which RSTP BPDUs are sent), and RSTP BPDUs are sent. While this timer is active, the switch processes all BPDUs received on that port and ignores the protocol type. If the switch receives an IEEE 802.1D BPDU after the port migration-delay timer has expired, it assumes that it is connected to an IEEE 802.1D switch and starts using only IEEE 802.1D BPDUs. However, if the RSTP switch is using IEEE 802.1D BPDUs on a port and receives an RSTP BPDU after the timer has expired, it restarts the timer and starts using RSTP BPDUs on that port. Configuring MSTP Features These sections contain this configuration information: • Default MSTP Configuration, page 16-14 • MSTP Configuration Guidelines, page 16-15 • Specifying the MST Region Configuration and Enabling MSTP, page 16-16 (required) • Configuring the Root Switch, page 16-17 (optional) • Configuring a Secondary Root Switch, page 16-18 (optional) • Configuring Port Priority, page 16-19 (optional) • Configuring Path Cost, page 16-20 (optional) • Configuring the Switch Priority, page 16-21 (optional) • Configuring the Hello Time, page 16-22 (optional) • Configuring the Forwarding-Delay Time, page 16-23 (optional) • Configuring the Maximum-Aging Time, page 16-23 (optional) • Configuring the Maximum-Hop Count, page 16-24 (optional) • Specifying the Link Type to Ensure Rapid Transitions, page 16-24 (optional) • Designating the Neighbor Type, page 16-25 (optional) • Restarting the Protocol Migration Process, page 16-25 (optional) Default MSTP Configuration Table 16-4 shows the default MSTP configuration. Table 16-4 Default MSTP Configuration Feature Spanning-tree mode Switch priority (configurable on a per-CIST port basis) Default Setting PVST+ (Rapid PVST+ and MSTP are disabled). 32768. 16-14 Catalyst 2960 Switch Software Configuration Guide OL-8603-04
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