HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual page 516

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Bridging—Transmitting Non-IP Traffic or Merging Two Networks

Configuring Spanning Tree

1. The network is stable.

2. A new link is added.

Figure 10-5. Asserting Sync

When network topology changes, devices assert sync to propagate new paths

in an ordered flow from devices closer to the root to devices further from the

root. A device sends a BDPU to a neighbor on a potential designated port. The

BPDU has a proposal flag set, which requests that the two ports immediately

transition to the forwarding state. If the neighbor determines that this BPDU

is best (the transmitting port is closest to the root), it replies with an agreement

BPDU. The neighbor also asserts sync: it makes the port on which it received

the BPDU its root port and shuts down all other ports except edge ports.

The neighbor then sends its own proposal BPDUs through the blocked ports.

If a neighboring device determines that the connection is best, it brings up its

port as root port and continues the process. Otherwise, it sends a non-

acknowledgement, and ports on both sides of the link enter the blocking state.

In this way, topology changes propagate rapidly from the root through to

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