Brocade FastIron Ethernet Switch Platform and Layer 2 Swit Manual de usuario descargar pdf (Pagina 283)

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Handshake when a root port has been elected

If a non-root bridge already has a Root port, 802.1W uses a different type of handshake. For example,

in the following figure, a new root bridge is added to the topology.

FIGURE 47 Addition of a new root bridge

The handshake that occurs between Switch 60 and Switch 100 follows the one described in the

previous section (Handshake when no root port is elected). The former root bridge becomes a non-root

bridge and establishes a Root port (Figure 48 ).

However, since Switch 200 already had a Root port in a forwarding state, 802.1W uses the Proposing -

> Proposed -> Sync and Reroot -> Sync and Rerooted -> Rerooted and Synced -> Agreed handshake:

• Proposing and Proposed - The Designated port on the new root bridge (Port4/Switch 60) sends an

RST BPDU that contains a proposing signal to Port4/Switch 200 to inform the port that it is ready to

put itself in a forwarding state (Figure 48 ). 802.1W algorithm determines that the RST BPDU that

Port4/Switch 200 received is superior to what it can generate, so Port4/Switch 200 assumes a Root

port role.

Spanning Tree Protocol

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