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Configuring Spanning Tree Protocol (STP) and IronSpan Features
December 2005
© Foundry Networks, Inc.
7 - 41
For example, Port3/Switch 2 in Figure 7.20, fails. Port4/Switch 3 becomes the new Root port. Port4/Switch 3
sends an RST BPDU with a TCN to Port4/Switch 4. To propagate the topology change, Port4/Switch 4 then starts
a TCN timer on itself, on the bridge’s Root port, and on other ports on that bridge with a Designated role. Then
Port3/Switch 4 sends RST BPDU with the TCN to Port4/Switch 2. (Note the new active Layer 2 path in Figure
7.20.)
Figure 7.20
Beginning of Topology Change Notice
Port2
Port2
Port7
Port8
Port3
Port3
Port4
Port4
Port3
Port2
Port3
Bridge priority = 200
Switch 4
Bridge priority = 400
Bridge priority = 300
Bridge priority = 1000
Port4
Port5
Port3
Port3
Switch 6
Bridge priority = 900
Bridge priority = 60
Port2
Port5
Port5
Port4
Indicates the active Layer 2 path
Indicates direction of TCN
Switch 1
Switch 2
Switch 5
Switch 6
Switch 4
Switch 3
Содержание FastIron Edge Switch X424
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