Configuration Guide User guide

384 BigIron RX Series Configuration Guide

53-1002484-04

Convergence in a complex RSTP topology

FIGURE 59 Beginning of topology change notice

Switch 2 then starts the TCN timer on the Designated ports and sends RST BPDUs that contain the

TCN as follows (Figure ):

• Port5/Switch 2 sends the TCN to Port2/Switch 5

• Port4/Switch 2 sends the TCN to Port4/Switch 6

• Port2/Switch 2 sends the TCN to Port2/Switch 1

Switch 1

Bridge priority = 1000

Switch 2

Bridge priority = 200

Switch 5

Bridge priority = 60

Switch 6

Bridge priority = 900

Switch 4

Bridge priority = 400

Switch 3

Bridge priority = 300

Port2 Port2

Port2

Port3

Port4

Port5

Port 5

Port5

Port7 Port8

Indicates the active Layer 2 path

Indicates direction of TCN