Skip to content
!!!I used real Cisco 3550 switch *4 to do this lab. I did not use Dynamips to do this lab.!!!
Objective:
The purpose of this lab is to observe the behavior of MST (multiple spanning tree).
Scenario:
In this lab, we will group VLANs using MST so that we can have less spanning tree
instances running at once to save switch CPU load.
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.
Configure ports f0/7 through f0/12 to be trunks.
All Switches:
Clearing all Switches
ALLSwitches(config)#interface range fastEthernet 0/7 - 12
ALLSwitches(config-if-range)#switchport trunk encapsulation dot1q
ALLSwitches(config-if-range)#switchport mode trunk
Step 2
Configure all switches with VTP mode transparent and VTP domain CISCO.
Add VLANs 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 to all of them.
All Switches:
ALLSwitches(config)#vtp mode transparent
ALLSwitches(config)#vtp domain CISCO
ALLSwitches(config)#vlan 10,20,30,40,50,60,70,80,90,100
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
30 VLAN0030 active
40 VLAN0040 active
50 VLAN0050 active
60 VLAN0060 active
70 VLAN0070 active
80 VLAN0080 active
90 VLAN0090 active
100 VLAN0100 active
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
DSL1#
Step 3
If you issue the show spanning-tree command on one of the switches,
you see 11 spanning tree instances running.
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 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 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 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
0 comments:
張貼留言