Understanding How Pvst+ And Mistp Modes Work - Cisco WS-C6506 Software Manual

Understanding How PVST+ and MISTP Modes Work

Disabled State
A port in the disabled state does not participate in frame forwarding or STP, as shown in
port in the disabled state is virtually nonoperational.
Figure 7-7
A disabled port performs as follows:
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Understanding How PVST+ and MISTP Modes Work
Catalyst 6500 series switches provide two proprietary spanning-tree modes that are based on the
IEEE 802.1D standard and one mode that is a combination of the two modes:
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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
7-12
Port 2 in Disabled State
All segment
frames
Port 1
Station
addresses
BPDUs
Filtering System
database module
Data
frames
Port 2
Disabled
Discards frames that are received from the attached segment.
Discards frames that are 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+)
Rapid-PVST+
Multi-Instance Spanning Tree Protocol (MISTP)
MISTP-PVST+ (combination mode)
Forwarding
Network
management
and data frames
Frame
forwarding
Network
management
frames
All segment
frames
Chapter 7 Configuring Spanning Tree
Figure
OL-8978-04
7-7. A