© M. Baldi: see page 2

Spanning Tree ProtocolExercises

Mario BaldiPolitecnico di Torino

(Technical University of Turin)http://www.mario-baldi.net

© M. Baldi: see page 2STP_exercises - 2

Copyright NoticeThis set of transparencies, hereinafter referred to as slides, is protected by copyright laws and provisions of International Treaties. The title and copyright regarding the slides (including, but not limited to, each and every image, photography, animation, video, audio, music and text) are property of the authors specified on page 1.The slides may be reproduced and used freely by research institutes, schools and Universities for non-profit, institutional purposes. In such cases, no authorization is requested.Any total or partial use or reproduction (including, but not limited to, reproduction on magnetic media, computer networks, and printed reproduction) is forbidden, unless explicitly authorized by the authors by means of written license.Information included in these slides is deemed as accurate at the date of publication. Such information is supplied for merely educational purposes and may not be used in designing systems, products, networks, etc. In any case, these slides are subject to changes without any previous notice. The authors do not assume any responsibility for the contents of these slides (including, but not limited to, accuracy, completeness, enforceability, updated-ness of information hereinafter provided). In any case, accordance with information hereinafter included must not be declared.In any case, this copyright notice must never be removed and must be reported even in partial uses.

© M. Baldi: see page 2STP_exercises - 3

Legenda and Conventions

S1

Device identifier

Port number 1

Switch

Hub

Link

StationServer

Router

Other ports are sequentially numbered clockwise. E.g., this is port 2

© M. Baldi: see page 2STP_exercises - 4

What is the outcome of the spanning tree protocol on this network?

What capacity should be used for the links?

S07

S03

S02

S11

S09

S01S08S06S05

S04H2

H1S12

H3

S13 S14 S15

S16

S17

© M. Baldi: see page 2STP_exercises - 5

What is the outcome of the spanning tree protocol on this network assuming that each bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

S07

S03

S02

S11

S09

S01S08S06S05

S04

H2H1

What capacity should be used for the links?How should the configuration be modified to optimize the resulting active topology?What is the consequence of disabling the STP on S01?

S12

H3

S13 S14 S15

S16

S17

© M. Baldi: see page 2STP_exercises - 6

S07

S03

S02

S11

S09

S01S08S06S05S04

H2H1S12

H3

S13 S14 S15

S16

S17

What is the outcome of the spanning tree protocol on this network assuming that each bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

What capacity should be used for the links?How should the configuration be modified to optimize the resulting active topology?

H1

H4

© M. Baldi: see page 2STP_exercises - 7

S13

S03

S11S10

S09

S08

S07

S06

S05

S04

S12

S13

S02

S01

What is the outcome of the spanning tree protocol on this network assuming that each bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

What capacity should be used for the links?How should the configuration be modified to optimize the resulting active topology?

© M. Baldi: see page 2STP_exercises - 8

S11

S07

S06

S05

S04

S03

S10

S01

S8

S9

S12

What is the outcome of the spanning tree protocol on this network assuming that each bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

What capacity should be used for the links?How should the configuration be modified to optimize the resulting active topology?

© M. Baldi: see page 2STP_exercises - 9

S11

S07

S06

S05

S04

S03

S10

S01

S8

S9

S12

What is the outcome of the spanning tree protocol on this network assuming that each bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

What capacity should be used for the links?How should the configuration be modified to optimize the resulting active topology?

© M. Baldi: see page 2STP_exercises - 10

What is the outcome of the rapid spanning tree protocol on this network assuming that each bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

S07

S03

S02

S11

S09

S01S08S06S05

S04

H2H1

What capacity should be used for the links?How should the configuration be modified to optimize the resulting active topology?

S12

H3

S13 S14 S15

S16

S17

© M. Baldi: see page 2STP_exercises - 11

S07

S03

S02

S11

S09

S01S08S06S05S04

H2H1S12

H3

S13 S14 S15

S16

S17

What is the outcome of the rapid spanning tree protocol on this network assuming that each bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

What capacity should be used for the links?How should the configuration be modified to optimize the resulting active topology?

H1

H4

© M. Baldi: see page 2STP_exercises - 12

S13

S03

S11S10

S09

S08

S07

S06

S05

S04

S12

S13

S02

S01

What is the outcome of the rapid spanning tree protocol on this network assuming that each bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

What capacity should be used for the links?How should the configuration be modified to optimize the resulting active topology?

© M. Baldi: see page 2STP_exercises - 13

S09

S03

S02

S11S10

S01

S08S07S06S05

S04

H2H1

What is the outcome of the spanning tree protocol on this network assuming that

stations of different colors belong to different VLANseach bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

How can the configuration be optimized?

© M. Baldi: see page 2STP_exercises - 14

S01

S03

S02

S11S10

S09

S08S07S06S05

S04

H2H1

What is the outcome of the spanning tree protocol on this network assuming that

stations of different colors belong to different VLANseach bridge Sxx uses as part of its bridge identifier the default bridge priority and the MAC address 03-0a-00-2b-3c-xx?

How can the configuration be optimized?