Cisco Catalyst 3120

Contents
xvii
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
OL-12247-01
IEEE 802.1s Implementation 18-6
Port Role Naming Change 18-7
Interoperation Between Legacy and Standard Switches 18-7
Detecting Unidirectional Link Failure 18-8
MSTP and Switch Stacks 18-8
Interoperability with IEEE 802.1D STP 18-9
Understanding RSTP 18-9
Port Roles and the Active Topology 18-9
Rapid Convergence 18-10
Synchronization of Port Roles 18-11
Bridge Protocol Data Unit Format and Processing 18-12
Processing Superior BPDU Information 18-13
Processing Inferior BPDU Information 18-13
Topology Changes 18-13
Configuring MSTP Features 18-14
Default MSTP Configuration 18-15
MSTP Configuration Guidelines 18-15
Specifying the MST Region Configuration and Enabling MSTP 18-16
Configuring the Root Switch 18-17
Configuring a Secondary Root Switch 18-19
Configuring Port Priority 18-19
Configuring Path Cost 18-21
Configuring the Switch Priority 18-21
Configuring the Hello Time 18-22
Configuring the Forwarding-Delay Time 18-23
Configuring the Maximum-Aging Time 18-23
Configuring the Maximum-Hop Count 18-24
Specifying the Link Type to Ensure Rapid Transitions 18-24
Designating the Neighbor Type 18-25
Restarting the Protocol Migration Process 18-25
Displaying the MST Configuration and Status 18-26
CHAPTER 19 Configuring Optional Spanning-Tree Features 19-1
Understanding Optional Spanning-Tree Features 19-1
Understanding Port Fast 19-2
Understanding BPDU Guard 19-2
Understanding BPDU Filtering 19-3
Understanding UplinkFast 19-3
Understanding Cross-Stack UplinkFast 19-5