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Ccnp3 lab 3_3_en

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Omar Herrera

The document describes a lab experiment with 4 switches to observe per-VLAN spanning tree behavior. It explains that VLANs 10 and 20 were configured on all switches with DLS1 set as the root bridge for VLAN 10 and DLS2 for VLAN 20. This resulted in different port roles and root bridges for each VLAN when viewed with the show spanning-tree command.

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1 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Lab 3-3 Per-VLAN Spanning Tree Behavior Objective The purpose of this lab is to observe what happens when there is a separate spanning tree instance per VLAN. This lab also looks at changing spanning tree mode to rapid spanning tree. Scenario Four switches have just been installed. The distribution layer switches are Catalyst 3560s, and the access layer switches are Catalyst 2960s. There are redundant uplinks between the access layer and distribution layer. Because of the possibility of bridging loops, spanning tree logically removes any redundant links. In this lab, you will see what happens when spanning tree is configured differently for different VLANs. Step 1 Start by deleting the vlan.dat file, erasing the startup config, and reloading all your switches. After reloading the switches, give them hostnames. Configure ports f0/7 through f0/12 to be trunks. On the 3560s, you first need to set the trunk encapsulation to dot1q. On the 2960s, only dot1q is supported, so it does not need to be set, but the mode still needs to be changed to trunk. If you do not set the mode of the ports to trunk, the links do not form trunks and remain access ports (the default mode on a 3560
2 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc or 2960 is dynamic auto; the default mode on a 3550 or 2950 is dynamic desirable). DLS1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. DLS1(config)#interface range f0/7 - 12 DLS1(config-if-range)#switchport trunk encapsulation dot1q DLS1(config-if-range)#switchport mode trunk Step 2 Configure all switches with VTP mode transparent and VTP domain CISCO. Add VLAN 10 and 20 to all of them. Use the show vlan brief command to view the VLAN configurations. DLS1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. DLS1(config)#vtp mode transparent Setting device to VTP TRANSPARENT mode. DLS1(config)#vtp domain CISCO Changing VTP domain name from NULL to CISCO DLS1(config)#vlan 10,20 DLS1(config-vlan)#end DLS1# 00:02:43: %SYS-5-CONFIG_I: Configured from console by console DLS1#show vlan brief VLAN Name Status Ports ---- -------------------------------- --------- ------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4 Fa0/5, Fa0/6, Fa0/9, Fa0/10 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 If you issue the show spanning-tree command on any of the four switches, you notice that instead of just one VLAN coming up, there are multiple VLANs. DLS1#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
3 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 32778 Address 000a.b8a9.d680 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 32788 Address 000a.b8a9.d680 Cost 19 Port 13 (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 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p Step 3
4 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc You may notice that all the ports have identical spanning tree behavior for each VLAN. This is because all VLANs are running spanning tree with the default behavior. However, 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. To change the priority for a given VLAN, use the spanning-tree vlan number priority number command. DLS1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. DLS1(config)#spanning-tree vlan 10 priority 4096 Configure DLS2 similarly for VLAN 20. If you look at the output of show spanning-tree on the four switches, you see that the port states and root switches vary on a per VLAN basis. DLS1#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 4106 Address 000a.b8a9.d780 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 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p
5 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 4116 Address 000a.b8a9.d680 Cost 19 Port 13 (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 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p DLS2#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 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 000a.b8a9.d680 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 4106 Address 000a.b8a9.d780 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 000a.b8a9.d680 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300
6 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Desg FWD 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 4116 Address 000a.b8a9.d680 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 4116 (priority 4096 sys-id-ext 20) Address 000a.b8a9.d680 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p ALS1#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 11 (FastEthernet0/9) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 0019.0635.5780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Altn BLK 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Root FWD 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 4106 Address 000a.b8a9.d780 Cost 19 Port 9 (FastEthernet0/7) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
7 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 0019.0635.5780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 15 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Root FWD 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Altn BLK 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 4116 Address 000a.b8a9.d680 Cost 19 Port 11 (FastEthernet0/9) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32788 (priority 32768 sys-id-ext 20) Address 0019.0635.5780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 15 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Altn BLK 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Root FWD 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p ALS2#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 9 (FastEthernet0/7) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 0019.068d.6980 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Root FWD 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Altn BLK 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Altn BLK 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p
8 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 4106 Address 000a.b8a9.d780 Cost 19 Port 11 (FastEthernet0/9) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 0019.068d.6980 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 15 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Altn BLK 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Root FWD 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Altn BLK 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 4116 Address 000a.b8a9.d680 Cost 19 Port 9 (FastEthernet0/7) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32788 (priority 32768 sys-id-ext 20) Address 0019.068d.6980 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 15 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Root FWD 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Altn BLK 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Altn BLK 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p Step 4 Other spanning tree modes besides regular PVST (per-VLAN spanning tree) are available. One of these modes is RSTP (rapid spanning tree protocol), which greatly reduces the time between a port coming up and changing to forwarding while still preventing bridging loops. To change the spanning tree mode to rapid spanning tree, use the global configuration command spanning-tree mode rapid-pvst. Configure this on all four switches. During the transition period, rapid spanning tree falls back to regular spanning tree on the links that have regular spanning tree on one side. DLS1(config)#spanning-tree mode rapid-pvst
9 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc After configuring all four switches with this command, use the show spanning-tree command to verify the configuration: DLS1#show spanning-tree VLAN0001 Spanning tree enabled protocol rstp Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 000a.b8a9.d780 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 BLK 19 128.9 P2p Fa0/8 Desg BLK 19 128.10 P2p Fa0/9 Desg BLK 19 128.11 P2p Fa0/10 Desg BLK 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0010 Spanning tree enabled protocol rstp Root ID Priority 4106 Address 000a.b8a9.d780 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 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0020 Spanning tree enabled protocol rstp Root ID Priority 4116 Address 000a.b8a9.d680 Cost 19 Port 13 (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 000a.b8a9.d780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300
10 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Desg BLK 19 128.9 P2p Fa0/8 Desg BLK 19 128.10 P2p Fa0/9 Desg BLK 19 128.11 P2p Fa0/10 Desg BLK 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p Challenge 1. On each switch, add VLANs 50, 60, 70, 80, 90, and 100. Configure ALS1 to be the root of VLANs 50, 60, and 70, and ALS2 to be the root of VLANs 80, 90, and 100. Configure the roots with a single line on each switch. HINT: Use the question mark when you type the global configuration command spanning-tree vlan ?. Notice that you can modify spanning tree attributes in ranges. 2. Change the spanning tree cost of VLAN 20 on f0/11 and f0/12 between DLS1 and DLS2 to 15. HINT: Use the question mark on the interface level command spanning- tree vlan number ?. END OF LAB FINAL CONFIGS: DLS1#show running-config ! hostname DLS1 ! ! vtp domain CISCO vtp mode transparent ! ! ! ! spanning-tree vlan 10 priority 4096 ! ! vlan 10,20,50,60,70,80,90,100 ! ! ! interface FastEthernet0/7 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/8
11 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/9 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/10 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/11 switchport trunk encapsulation dot1q switchport mode trunk spanning-tree vlan 20 cost 15 ! interface FastEthernet0/12 switchport trunk encapsulation dot1q switchport mode trunk spanning-tree vlan 20 cost 15 ! ! end DLS2#show running-config ! hostname DLS2 ! ! vtp domain CISCO vtp mode transparent ! ! ! ! spanning-tree vlan 20 priority 4096 ! ! vlan 10,20,50,60,70,80,90,100 ! ! interface FastEthernet0/7 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/8 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/9 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/10 switchport trunk encapsulation dot1q
12 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc switchport mode trunk ! interface FastEthernet0/11 switchport trunk encapsulation dot1q switchport mode trunk spanning-tree vlan 20 cost 15 ! interface FastEthernet0/12 switchport trunk encapsulation dot1q switchport mode trunk spanning-tree vlan 20 cost 15 ! ! end ALS1#show running-config ! hostname ALS1 ! ! vtp domain CISCO vtp mode transparent ! ! ! spanning-tree vlan 50-70 priority 24576 ! ! vlan 10,20,50,60,70,80,90,100 ! ! interface FastEthernet0/7 switchport mode trunk ! interface FastEthernet0/8 switchport mode trunk ! interface FastEthernet0/9 switchport mode trunk ! interface FastEthernet0/10 switchport mode trunk ! interface FastEthernet0/11 switchport mode trunk ! interface FastEthernet0/12 switchport mode trunk ! ! end ALS2#show running-config ! hostname ALS2 ! ! vtp domain CISCO vtp mode transparent !
13 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc ! ! ! spanning-tree vlan 80,90,100 priority 24576 ! ! vlan 10,20,50,60,70,80,90,100 ! ! interface FastEthernet0/7 switchport mode trunk ! interface FastEthernet0/8 switchport mode trunk ! interface FastEthernet0/9 switchport mode trunk ! interface FastEthernet0/10 switchport mode trunk ! interface FastEthernet0/11 switchport mode trunk ! interface FastEthernet0/12 switchport mode trunk ! ! end

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Ccnp3 lab 3_3_en

  • 1. 1 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Lab 3-3 Per-VLAN Spanning Tree Behavior Objective The purpose of this lab is to observe what happens when there is a separate spanning tree instance per VLAN. This lab also looks at changing spanning tree mode to rapid spanning tree. Scenario Four switches have just been installed. The distribution layer switches are Catalyst 3560s, and the access layer switches are Catalyst 2960s. There are redundant uplinks between the access layer and distribution layer. Because of the possibility of bridging loops, spanning tree logically removes any redundant links. In this lab, you will see what happens when spanning tree is configured differently for different VLANs. Step 1 Start by deleting the vlan.dat file, erasing the startup config, and reloading all your switches. After reloading the switches, give them hostnames. Configure ports f0/7 through f0/12 to be trunks. On the 3560s, you first need to set the trunk encapsulation to dot1q. On the 2960s, only dot1q is supported, so it does not need to be set, but the mode still needs to be changed to trunk. If you do not set the mode of the ports to trunk, the links do not form trunks and remain access ports (the default mode on a 3560
  • 2. 2 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc or 2960 is dynamic auto; the default mode on a 3550 or 2950 is dynamic desirable). DLS1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. DLS1(config)#interface range f0/7 - 12 DLS1(config-if-range)#switchport trunk encapsulation dot1q DLS1(config-if-range)#switchport mode trunk Step 2 Configure all switches with VTP mode transparent and VTP domain CISCO. Add VLAN 10 and 20 to all of them. Use the show vlan brief command to view the VLAN configurations. DLS1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. DLS1(config)#vtp mode transparent Setting device to VTP TRANSPARENT mode. DLS1(config)#vtp domain CISCO Changing VTP domain name from NULL to CISCO DLS1(config)#vlan 10,20 DLS1(config-vlan)#end DLS1# 00:02:43: %SYS-5-CONFIG_I: Configured from console by console DLS1#show vlan brief VLAN Name Status Ports ---- -------------------------------- --------- ------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4 Fa0/5, Fa0/6, Fa0/9, Fa0/10 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 If you issue the show spanning-tree command on any of the four switches, you notice that instead of just one VLAN coming up, there are multiple VLANs. DLS1#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
  • 3. 3 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 32778 Address 000a.b8a9.d680 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 32788 Address 000a.b8a9.d680 Cost 19 Port 13 (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 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p Step 3
  • 4. 4 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc You may notice that all the ports have identical spanning tree behavior for each VLAN. This is because all VLANs are running spanning tree with the default behavior. However, 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. To change the priority for a given VLAN, use the spanning-tree vlan number priority number command. DLS1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. DLS1(config)#spanning-tree vlan 10 priority 4096 Configure DLS2 similarly for VLAN 20. If you look at the output of show spanning-tree on the four switches, you see that the port states and root switches vary on a per VLAN basis. DLS1#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 4106 Address 000a.b8a9.d780 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 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p
  • 5. 5 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 4116 Address 000a.b8a9.d680 Cost 19 Port 13 (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 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p DLS2#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 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 000a.b8a9.d680 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 4106 Address 000a.b8a9.d780 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 000a.b8a9.d680 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300
  • 6. 6 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Desg FWD 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 4116 Address 000a.b8a9.d680 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 4116 (priority 4096 sys-id-ext 20) Address 000a.b8a9.d680 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p ALS1#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 11 (FastEthernet0/9) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 0019.0635.5780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Altn BLK 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Root FWD 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 4106 Address 000a.b8a9.d780 Cost 19 Port 9 (FastEthernet0/7) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
  • 7. 7 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 0019.0635.5780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 15 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Root FWD 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Altn BLK 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 4116 Address 000a.b8a9.d680 Cost 19 Port 11 (FastEthernet0/9) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32788 (priority 32768 sys-id-ext 20) Address 0019.0635.5780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 15 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Altn BLK 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Root FWD 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p ALS2#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 9 (FastEthernet0/7) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 0019.068d.6980 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Root FWD 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Altn BLK 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Altn BLK 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p
  • 8. 8 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc VLAN0010 Spanning tree enabled protocol ieee Root ID Priority 4106 Address 000a.b8a9.d780 Cost 19 Port 11 (FastEthernet0/9) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 0019.068d.6980 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 15 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Altn BLK 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Root FWD 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Altn BLK 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0020 Spanning tree enabled protocol ieee Root ID Priority 4116 Address 000a.b8a9.d680 Cost 19 Port 9 (FastEthernet0/7) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32788 (priority 32768 sys-id-ext 20) Address 0019.068d.6980 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 15 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Root FWD 19 128.9 P2p Fa0/8 Altn BLK 19 128.10 P2p Fa0/9 Altn BLK 19 128.11 P2p Fa0/10 Altn BLK 19 128.12 P2p Fa0/11 Altn BLK 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p Step 4 Other spanning tree modes besides regular PVST (per-VLAN spanning tree) are available. One of these modes is RSTP (rapid spanning tree protocol), which greatly reduces the time between a port coming up and changing to forwarding while still preventing bridging loops. To change the spanning tree mode to rapid spanning tree, use the global configuration command spanning-tree mode rapid-pvst. Configure this on all four switches. During the transition period, rapid spanning tree falls back to regular spanning tree on the links that have regular spanning tree on one side. DLS1(config)#spanning-tree mode rapid-pvst
  • 9. 9 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc After configuring all four switches with this command, use the show spanning-tree command to verify the configuration: DLS1#show spanning-tree VLAN0001 Spanning tree enabled protocol rstp Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 000a.b8a9.d780 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 BLK 19 128.9 P2p Fa0/8 Desg BLK 19 128.10 P2p Fa0/9 Desg BLK 19 128.11 P2p Fa0/10 Desg BLK 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p VLAN0010 Spanning tree enabled protocol rstp Root ID Priority 4106 Address 000a.b8a9.d780 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 000a.b8a9.d780 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 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p Fa0/10 Desg FWD 19 128.12 P2p Fa0/11 Desg FWD 19 128.13 P2p Fa0/12 Desg FWD 19 128.14 P2p VLAN0020 Spanning tree enabled protocol rstp Root ID Priority 4116 Address 000a.b8a9.d680 Cost 19 Port 13 (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 000a.b8a9.d780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300
  • 10. 10 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Desg BLK 19 128.9 P2p Fa0/8 Desg BLK 19 128.10 P2p Fa0/9 Desg BLK 19 128.11 P2p Fa0/10 Desg BLK 19 128.12 P2p Fa0/11 Root FWD 19 128.13 P2p Fa0/12 Altn BLK 19 128.14 P2p Challenge 1. On each switch, add VLANs 50, 60, 70, 80, 90, and 100. Configure ALS1 to be the root of VLANs 50, 60, and 70, and ALS2 to be the root of VLANs 80, 90, and 100. Configure the roots with a single line on each switch. HINT: Use the question mark when you type the global configuration command spanning-tree vlan ?. Notice that you can modify spanning tree attributes in ranges. 2. Change the spanning tree cost of VLAN 20 on f0/11 and f0/12 between DLS1 and DLS2 to 15. HINT: Use the question mark on the interface level command spanning- tree vlan number ?. END OF LAB FINAL CONFIGS: DLS1#show running-config ! hostname DLS1 ! ! vtp domain CISCO vtp mode transparent ! ! ! ! spanning-tree vlan 10 priority 4096 ! ! vlan 10,20,50,60,70,80,90,100 ! ! ! interface FastEthernet0/7 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/8
  • 11. 11 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/9 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/10 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/11 switchport trunk encapsulation dot1q switchport mode trunk spanning-tree vlan 20 cost 15 ! interface FastEthernet0/12 switchport trunk encapsulation dot1q switchport mode trunk spanning-tree vlan 20 cost 15 ! ! end DLS2#show running-config ! hostname DLS2 ! ! vtp domain CISCO vtp mode transparent ! ! ! ! spanning-tree vlan 20 priority 4096 ! ! vlan 10,20,50,60,70,80,90,100 ! ! interface FastEthernet0/7 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/8 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/9 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/10 switchport trunk encapsulation dot1q
  • 12. 12 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc switchport mode trunk ! interface FastEthernet0/11 switchport trunk encapsulation dot1q switchport mode trunk spanning-tree vlan 20 cost 15 ! interface FastEthernet0/12 switchport trunk encapsulation dot1q switchport mode trunk spanning-tree vlan 20 cost 15 ! ! end ALS1#show running-config ! hostname ALS1 ! ! vtp domain CISCO vtp mode transparent ! ! ! spanning-tree vlan 50-70 priority 24576 ! ! vlan 10,20,50,60,70,80,90,100 ! ! interface FastEthernet0/7 switchport mode trunk ! interface FastEthernet0/8 switchport mode trunk ! interface FastEthernet0/9 switchport mode trunk ! interface FastEthernet0/10 switchport mode trunk ! interface FastEthernet0/11 switchport mode trunk ! interface FastEthernet0/12 switchport mode trunk ! ! end ALS2#show running-config ! hostname ALS2 ! ! vtp domain CISCO vtp mode transparent !
  • 13. 13 - 13 CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-3 Copyright © 2006, Cisco Systems, Inc ! ! ! spanning-tree vlan 80,90,100 priority 24576 ! ! vlan 10,20,50,60,70,80,90,100 ! ! interface FastEthernet0/7 switchport mode trunk ! interface FastEthernet0/8 switchport mode trunk ! interface FastEthernet0/9 switchport mode trunk ! interface FastEthernet0/10 switchport mode trunk ! interface FastEthernet0/11 switchport mode trunk ! interface FastEthernet0/12 switchport mode trunk ! ! end