!!!I used real Cisco 3550 switch *4 to do this lab. I did not use Dynamips to do this lab.!!!
Objective:
This lab also looks at changing spanning tree mode to rapid spanning tree.
Scenario:
In this lab, you will see what happens when spanning tree is configured differently for different VLANs.
Basic Configuration:
DLS(1-2) & ALS(1-2):
enable
configure terminal
!
no ip domain lookup
!
line console 0
logging synchronous
exec-timeout 0 0
!
hostname
Step 1
Start by deleting the vlan.dat file, erasing the startup config, and reloading all your switches.
All Switch:
Clearing all Switches
Step 2
Configure all switches with VTP mode transparent and VTP domain CISCO.
Add VLAN 10 and 20 to all of them.
All Switches:
All Switches(config)#vtp mode transparent
All Switches(config)#vtp domain CISCO
All Switches(config)#vlan 10,20
DSL1:
DSL1#show vlan brief
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5, Fa0/6, Fa0/13, Fa0/14
Fa0/15, Fa0/16, Fa0/17, Fa0/18
Fa0/19, Fa0/20, Fa0/21, Fa0/22
Fa0/23, Fa0/24, Gi0/1, Gi0/2
10 VLAN0010 active
20 VLAN0020 active
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
DSL1#
DSL1#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 000e.d7a6.9c80
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 000e.d7a6.9c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Desg FWD 19 128.7 P2p
Fa0/8 Desg FWD 19 128.8 P2p
Fa0/9 Desg FWD 19 128.9 P2p
Fa0/10 Desg FWD 19 128.10 P2p
Fa0/11 Desg FWD 19 128.11 P2p
Fa0/12 Desg FWD 19 128.12 P2p
VLAN0010
Spanning tree enabled protocol ieee
Root ID Priority 32778
Address 000e.d7a6.9c80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32778 (priority 32768 sys-id-ext 10)
Address 000e.d7a6.9c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 15
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Desg FWD 19 128.7 P2p
Fa0/8 Desg FWD 19 128.8 P2p
Fa0/9 Desg FWD 19 128.9 P2p
Fa0/10 Desg FWD 19 128.10 P2p
Fa0/11 Desg FWD 19 128.11 P2p
Fa0/12 Desg FWD 19 128.12 P2p
VLAN0020
Spanning tree enabled protocol ieee
Root ID Priority 32788
Address 000e.d7a6.9c80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)
Address 000e.d7a6.9c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 15
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Desg FWD 19 128.7 P2p
Fa0/8 Desg FWD 19 128.8 P2p
Fa0/9 Desg FWD 19 128.9 P2p
Fa0/10 Desg FWD 19 128.10 P2p
Fa0/11 Desg FWD 19 128.11 P2p
Fa0/12 Desg FWD 19 128.12 P2p
DSL1#
Step 3
We can modify the default spanning tree behavior on a per-VLAN basis.
For this lab, we assign DLS1 the root switch for VLAN 10, and DLS2 for VLAN 20.
DSL1(config)#spanning-tree vlan 10 priority 4096
DSL2(config)#spanning-tree vlan 20 priority 4096
DSL1#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 000e.d7a6.9c80
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 000e.d7a6.9c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Desg FWD 19 128.7 P2p
Fa0/8 Desg FWD 19 128.8 P2p
Fa0/9 Desg FWD 19 128.9 P2p
Fa0/10 Desg FWD 19 128.10 P2p
Fa0/11 Desg FWD 19 128.11 P2p
Fa0/12 Desg FWD 19 128.12 P2p
VLAN0010
Spanning tree enabled protocol ieee
Root ID Priority 4106
Address 000e.d7a6.9c80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4106 (priority 4096 sys-id-ext 10)
Address 000e.d7a6.9c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Desg FWD 19 128.7 P2p
Fa0/8 Desg FWD 19 128.8 P2p
Fa0/9 Desg FWD 19 128.9 P2p
Fa0/10 Desg FWD 19 128.10 P2p
Fa0/11 Desg FWD 19 128.11 P2p
Fa0/12 Desg FWD 19 128.12 P2p
VLAN0020
Spanning tree enabled protocol ieee
Root ID Priority 4116
Address 000e.d7a6.ab00
Cost 19
Port 11 (FastEthernet0/11)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)
Address 000e.d7a6.9c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 15
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Desg FWD 19 128.7 P2p
Fa0/8 Desg FWD 19 128.8 P2p
Fa0/9 Desg FWD 19 128.9 P2p
Fa0/10 Desg FWD 19 128.10 P2p
Fa0/11 Root FWD 19 128.11 P2p
Fa0/12 Altn BLK 19 128.12 P2p
DSL1#
Step 4
Other spanning tree modes besides regular PVST (per-VLAN spanning tree) are available.
Configure this on all four switches.
All Switches:
All Switches(config)#spanning-tree mode rapid-pvst
DSL1#show spanning-tree
VLAN0001
Spanning tree enabled protocol rstp
Root ID Priority 32769
Address 000e.d7a6.9c80
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 000e.d7a6.9c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Desg FWD 19 128.7 P2p
Fa0/8 Desg FWD 19 128.8 P2p Peer(STP)
Fa0/9 Desg FWD 19 128.9 P2p
Fa0/10 Desg FWD 19 128.10 P2p
Fa0/11 Desg FWD 19 128.11 P2p
Fa0/12 Desg FWD 19 128.12 P2p
VLAN0010
Spanning tree enabled protocol rstp
Root ID Priority 4106
Address 000e.d7a6.9c80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4106 (priority 4096 sys-id-ext 10)
Address 000e.d7a6.9c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Desg FWD 19 128.7 P2p
Fa0/8 Desg FWD 19 128.8 P2p
Fa0/9 Desg FWD 19 128.9 P2p
Fa0/10 Desg FWD 19 128.10 P2p Peer(STP)
Fa0/11 Desg FWD 19 128.11 P2p
Fa0/12 Desg FWD 19 128.12 P2p
VLAN0020
Spanning tree enabled protocol rstp
Root ID Priority 4116
Address 000e.d7a6.ab00
Cost 19
Port 11 (FastEthernet0/11)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)
Address 000e.d7a6.9c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Desg FWD 19 128.7 P2p
Fa0/8 Desg FWD 19 128.8 P2p
Fa0/9 Desg FWD 19 128.9 P2p
Fa0/10 Desg FWD 19 128.10 P2p
Fa0/11 Root FWD 19 128.11 P2p
Fa0/12 Altn BLK 19 128.12 P2p
DSL1#
Final Configurations
DLS1:
hostname DSL1
!
no ip domain-lookup
!
vtp domain CISCO
vtp mode transparent
!
spanning-tree mode rapid-pvst
!
spanning-tree vlan 10 priority 4096
!
vlan 10,20
!
line con 0
exec-timeout 0 0
logging synchronous
!
end
DLS2:
hostname DSL2
!
no ip domain-lookup
!
vtp domain CISCO
vtp mode transparent
!
spanning-tree mode rapid-pvst
!
spanning-tree vlan 20 priority 4096
!
vlan 10,20
!
line con 0
exec-timeout 0 0
logging synchronous
!
end
ALS1:
hostname ASL1
!
no ip domain-lookup
!
vtp domain CISCO
vtp mode transparent
!
spanning-tree mode rapid-pvst
!
vlan 10,20
!
line con 0
exec-timeout 0 0
logging synchronous
!
end
ALS2:
hostname ASL2
!
no ip domain-lookup
!
vtp domain CISCO
vtp mode transparent
!
spanning-tree mode rapid-pvst
!
vlan 10,20
!
line con 0
exec-timeout 0 0
logging synchronous
!
end
Reference:
Cisco Networking Academy
http://www.cisco.com/web/learning/netacad/index.html
CCNP Version 5.0: Building Multilayer Switched Networks
Student Lab Manual
最初發表 / 最後更新: 2008.10.07 / 2018.06.07
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