Understanding Pvst+ And Mistp Modes - Cisco WS-C4003 - Catalyst 4000 Chassis Switch Software Configuration Manual

Chapter 7 Configuring Spanning Tree
Figure 7-7
A disabled port performs as follows:
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Understanding PVST+ and MISTP Modes

Catalyst 4000 family switches provide two proprietary spanning tree modes based on the IEEE 802.1D
standard and one mode that is a combination of the two modes:
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An overview of each mode is provided in this section. Each mode is described in detail in these sections:
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Port 2 in Disabled State
All segment
frames
Port 1
Station
addresses
BPDUs
Filtering System
database module
Data
frames
Port 2
Disabled
Discards frames received from the attached segment.
Discards frames switched from another port for forwarding.
Does not incorporate station location into its address database. (There is no learning, so there is no
address database update.)
Receives BPDUs but does not direct them to the system module.
Does not receive BPDUs for transmission from the system module.
Receives and responds to network management messages.
Per VLAN Spanning Tree (PVST+)
Multi-Instance Spanning Tree Protocol (MISTP)
MISTP-PVST+ (combination mode)
Using PVST+, page 7-12
Using MISTP-PVST+ or MISTP, page 7-18
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
Forwarding
Network
management
and data frames
Frame
forwarding
Network
management
frames
All segment
frames
Understanding PVST+ and MISTP Modes
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