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STP Configuration Guide

This document describes the configuration and status of a small switched network with 5 switches (SW1-SW5). SW4 was originally the root bridge but changing SW5's priority to 4096 made it the new root bridge. The document shows the MAC address tables for SW4 and SW5, and the spanning tree configuration and status for each switch.

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badr boutouja
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147 views5 pages

STP Configuration Guide

This document describes the configuration and status of a small switched network with 5 switches (SW1-SW5). SW4 was originally the root bridge but changing SW5's priority to 4096 made it the new root bridge. The document shows the MAC address tables for SW4 and SW5, and the spanning tree configuration and status for each switch.

Uploaded by

badr boutouja
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Application STP

1) Nombre de ports bloqué=4

Nbre ligne =8
Nbre swit=5
Nbre port bloque= (8-5)+1=4
2) Commutateur racine= ?
SW4 est le commutateur racine : il posséde @MAC la plus petite
3) Chemin emprunté lors d’une requête ICMP Entre
a) PC21-----PC41 (SW2---SW1----SW4)
b) PC31-----PC41 (SW3----SW4)
4) Afficher la table MAC de SW4 et SW5

5) Changer la priorité de SW5 à 4096

6) Commutateur racine= ?
SW4#show mac address-table SW5#show mac address-table
Mac Address Table Mac Address Table
------------------------------------------- -------------------------------------------
Vlan Mac Address Type Ports Vlan Mac Address Type Ports
---- ----------- -------- ----- ---- ----------- -------- -----
1 0001.43c0.386b DYNAMIC Fa2/1 1 000c.8510.15ad DYNAMIC Fa1/1
1 0004.9ab5.74d2 DYNAMIC Fa0/1 1 00d0.bc32.3e03 DYNAMIC Fa0/1
1 00d0.582e.e628 DYNAMIC Fa1/1

SW1#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.978D.B7A7
Cost 19
Port 1(FastEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)


Address 000C.85B5.9D6D
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type


---------------- ---- --- --------- -------- --------------------------------
Fa1/1 Desg FWD 19 128.2 P2p
Fa2/1 Desg FWD 19 128.3 P2p
Fa3/1 Desg FWD 19 128.4 P2p
Fa0/1 Root FWD 19 128.1 P2p

SW2#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.978D.B7A7
Cost 38
Port 1(FastEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)


Address 0090.0C03.A148
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type


---------------- ---- --- --------- -------- --------------------------------
Fa0/4 Desg FWD 19 128.4 P2p
Fa0/3 Altn BLK 19 128.3 P2p
Fa0/2 Altn BLK 19 128.2 P2p
Fa0/1 Root FWD 19 128.1 P2p

SW3#sh spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.978D.B7A7
Cost 19
Port 2(FastEthernet1/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)


Address 00D0.BA92.BAED
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type


---------------- ---- --- --------- -------- --------------------------------
Fa0/1 Desg FWD 19 128.1 P2p
Fa1/1 Root FWD 19 128.2 P2p
Fa3/1 Desg FWD 19 128.4 P2p
Fa2/1 Desg FWD 19 128.3 P2p
SW4#sh spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.978D.B7A7
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)


Address 0001.978D.B7A7
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type


---------------- ---- --- --------- -------- --------------------------------
Fa2/1 Desg FWD 19 128.3 P2p
Fa3/1 Desg FWD 19 128.4 P2p
Fa0/1 Desg FWD 19 128.1 P2p
Fa1/1 Desg FWD 19 128.2 P2p

SW5#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.978D.B7A7
Cost 19
Port 2(FastEthernet1/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)


Address 00E0.A322.E09C
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type


---------------- ---- --- --------- -------- --------------------------------
Fa1/1 Root FWD 19 128.2 P2p
Fa2/1 Altn BLK 19 128.3 P2p
Fa3/1 Altn BLK 19 128.4 P2p
Fa0/1 Desg FWD 19 128.1 P2p

SW1 SW2 SW3 SW4 SW5


Priority 32769 32769 32769 32769 32769
MAC 000C.85B5.9D6D 0090.0C03.A148 00D0.BA92.BAED 0001.978D.B7A7 00E0.A322.E09C

SW5(config)#spanning-tree vlan 1 priority 64


% Bridge Priority must be in increments of 4096.
% Allowed values are:
0 4096 8192 12288 16384 20480 24576 28672
32768 36864 40960 45056 49152 53248 57344 61440
SW5#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 4097
Address 00E0.A322.E09C
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 4097 (priority 4096 sys-id-ext 1)


Address 00E0.A322.E09C
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa1/1 Desg FWD 19 128.2 P2p
Fa2/1 Desg FWD 19 128.3 P2p
Fa3/1 Desg FWD 19 128.4 P2p
Fa0/1 Desg FWD 19 128.1 P2p

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