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ZyXEL Communications ES-4024A User Manual

Page 72

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ES-4024A Series Switch Support Notes


All contents copyright (c) 2006 ZyXEL Communications Corporation.

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1. Switch A bridge ID = 8000:00A0:C511:1111, Switch B bridge ID =

8000:00A0:C522:2222, Switch C bridge ID =

0001:00A0:C533:3333. Switch C has the lowest bridge ID, so

Switch C is the root bridge. All ports of the root bridge are

designated ports, so Port 1 is designated port.

2. For non-root bridge Switch A, Port 1 path cost to root bridge is 19,

Port 2 path cost is 119, 100 (Switch A Port 2) + 19 (Switch B Port 1).

For Switch B, Port 1 path cost is 19, Port 2 path cost is 119. Root

port = Port 1 of Switch A and Switch B because it has the lowest

path cost to the root bridge Switch C.

3. On Segment A, both Port 2 of Switch A and Switch B have the

same path cost to root bridge. Since Switch A has lower bridge ID

than Switch B, the designated port is selected on Switch A. So Port

2 of Switch A is designated port.

Blocking = Port 2 of Switch B, the non designated port on the segment.

Forwarding = All designated ports and root ports.