Figure; Rapid Pvst+ Bpdus; Proposal And Agreement Handshake - Cisco AJ732A - MDS 9134 Fabric Switch Configuration Manual

Cisco nexus 5000 series switch cli software configuration guide, nx-os 4.0(1a)n1 (ol-16597-01, january 2009)

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Information About Rapid PVST+

S e n d f e e d b a c k t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m

The TCA flag is used only when the switch is interacting with switches that are running legacy 802.1D

STP. See the

information about Rapid PVST+ interaction with 802.1D STP.

The proposal and agreement sequence then quickly propagates toward the edge of the network and

quickly restores connectivity after a topology change (see the

Rapid PVST+ and 802.1w use all six bits of the flag byte to add the role and state of the port that

originates the BPDU, and the proposal and agreement handshake.

flags in Rapid PVST+.

Figure 8-3

Topology change

Another important change is that the Rapid PVST+ BPDU is type 2, version 2, which makes it possible

for the switch to detect connected legacy (802.1D) bridges. The BPDU for 802.1D is version 0.

ports are in the blocking state. Assume that the priority of switch A is a smaller numerical value than the

priority of switch B.

Cisco Nexus 5000 Series Switch CLI Software Configuration Guide

"Rapid PVST+ Interoperation with Legacy 802.1D STP" section on page 8-16

Rapid PVST+ Flag Byte in BPDU

8-4, switch A is connected to switch B through a point-to-point link, and all of the

Topology change ACK

01 Alternate/Backup

11 Designated

Configuring Rapid PVST+

"Synchronization of Port Roles" section

shows the use of the BPDU

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