Brocade FastIron Ethernet Switch Platform and Layer 2 Swit Manual do Utilizador descarregar pdf (Página 291)

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currently being received by the current Root port (Port4). Therefore, Port3 retains the role of Alternate

port.

Ports 3/Switch 1 and Port5/Switch 1 are physically connected. Port5/Switch 1 received RST BPDUs that

are superior to those received on Port3/Switch 1; therefore, Port5/Switch 1 is given the Backup port role

while Port3 is given the Designated port role. Port3/Switch 1, does not go directly into a forwarding

state. It waits until the forward delay time expires twice on that port before it can proceed to the

forwarding state.

Once convergence is achieved, the active Layer 2 forwarding path converges as shown in the following

figure.

FIGURE 55 Active Layer 2 path

Convergence after a link failure

The following figure illustrates a link failure in the 802.1W topology. In this example, Port2/Switch, which

is the port that connects Switch 2 to the root bridge (Switch 1), failed and both Switch 2 and Switch 1

are affected by the topology change.

Convergence after a link failure

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