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Ccnp3 lab 3_4_en
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc Lab 3-4 Multiple Spanning Tree Objective The purpose of this lab is to observe the behavior of MST (multiple 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, we will group VLANs using MST so that we can have less spanning tree instances running at once to save switch CPU load. Step 1 Start by deleting vlan.dat, erasing the startup configuration, and reloading 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 be trunk, the
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc links do not form trunks and remain access ports (default mode on a 3560 or 2960 is dynamic auto; 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 VLANs 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 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 10,20,30,40,50,60,70,80,90,100 DLS1(config-vlan)#end DLS1#show vlan brief 00:11:56: %SYS-5-CONFIG_I: Configured from console by console VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4 Fa0/5, Fa0/6, Fa0/7, Fa0/8 Fa0/9, Fa0/10, Fa0/11, Fa0/12 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 Step 3 If you issue the show spanning-tree command on one of the switches, you see 11 spanning tree instances running. DLS1#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 000a.b8a9.d680 Cost 19
3.
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc 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 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 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 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 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
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc <output omitted> VLAN0090 Spanning tree enabled protocol ieee Root ID Priority 32858 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 32858 (priority 32768 sys-id-ext 90) 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 VLAN0100 Spanning tree enabled protocol ieee Root ID Priority 32868 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 32868 (priority 32768 sys-id-ext 100) 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 Spanning tree is running a separate spanning tree instance for each VLAN we created, plus VLAN 1. This method assumes that each VLAN could be running on a differently shaped topology. However, in many networks, multiple VLANs follow the same physical topology, so multiple spanning- tree calculations for the same topologies can get redundant. MST (multiple spanning tree) lets you configure different spanning tree instances. Each instance can hold a group of VLANs and gets its own spanning tree calculation. MST is convenient in that it is backward compatible with PVST. Two switches only run MST with each other if they are in the same MST region. An MST region is defined by switches having identical region names,
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc revision numbers, and VLAN-to-instance assignments. If they differ by any single attribute, they are considered different MST regions and fall back to PVST. Step 4 To configure MST, first use the global configuration command spanning- tree mode mst on all four switches. DLS1(config)#spanning-tree mode mst By default, all VLANs are assigned to instance 0, but can be moved around to different instances when MST is configured. Issue the show spanning-tree command and observe that there is only one spanning tree (instance 0) coming up. Also notice that the mode is listed as MSTP. DLS1#show spanning-tree MST00 Spanning tree enabled protocol mstp Root ID Priority 32768 Address 000a.b8a9.d680 Cost 0 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32768 (priority 32768 sys-id-ext 0) Address 000a.b8a9.d780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Desg FWD 200000 128.9 P2p Fa0/8 Desg BLK 200000 128.10 P2p Fa0/9 Desg FWD 200000 128.11 P2p Fa0/10 Desg FWD 200000 128.12 P2p Fa0/11 Root FWD 200000 128.13 P2p Fa0/12 Altn BLK 200000 128.14 P2p If you use the show spanning-tree mst configuration command, you can see a switch’s current MST configuration. Because you have not configured any MST region settings, the switch shows the default settings. DLS1#show spanning-tree mst configuration Name [] Revision 0 Instance Vlans mapped -------- --------------------------------------------------------------- 0 1-4094 ------------------------------------------------------------------------- Step 5 Now that MST has been enabled, we can configure the MST region settings to group VLANs. We use the region name CISCO and a revision number of 1. We put VLANs 20 through 50 into instance 1, and 80 and 100 into instance 2. The rest of the VLANs remain in instance 0, the
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc default. To begin modifying the MST configuration, type the global configuration command spanning-tree mst configuration. Configuring MST is different from other switch configurations, because changes are not applied until you are done, and you can abort changes if you want to. Note: You must apply identical configurations on each switch for MST to work properly. DLS1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. DLS1(config)#spanning-tree mst configuration DLS1(config-mst)# When you are in MST configuration mode, you can view the current configuration using the show current command. You do not need to leave configuration mode to execute this command. Notice that the output is identical to show spanning-tree mst configuration. DLS1(config-mst)#show current Current MST configuration Name [] Revision 0 Instance Vlans mapped -------- --------------------------------------------------------------- 0 1-4094 ------------------------------------------------------------------------- Change the region name by typing name name. Change the revision number by typing revision number. DLS1(config-mst)#name CISCO DLS1(config-mst)#revision 1 The last configuration change you have to make is putting VLANs into instances. Use the command instance number vlan vlan_range. The instance number can be between 0 and 15. Remember that 0 is the default instance number. DLS1(config-mst)# instance 1 vlan 20-50 DLS1(config-mst)# instance 2 vlan 80, 100 You can verify the changes you are about to make with the show pending command. Remember that the changes that you just entered are not committed until you type exit. If you do not like the changes you made, you can leave the prompt without committing them by typing abort. In the output below, notice the difference between show current and show pending. DLS1(config-mst)#show current Current MST configuration Name [] Revision 0 Instance Vlans mapped -------- --------------------------------------------------------------- 0 1-4094
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc ------------------------------------------------------------------------- DLS1(config-mst)#show pending Pending MST configuration Name [CISCO] Revision 1 Instance Vlans mapped -------- --------------------------------------------------------------- 0 1-19,51-79,81-99,101-4094 1 20-50 2 80,100 ------------------------------------------------------------------------- DLS1(config-mst)#exit If you enter the show spanning-tree mst configuration command, you can see that the current configuration reflects the changes you just committed. Remember to perform the same configuration on all four switches. DLS1#show span mst configuration Name [CISCO] Revision 1 Instance Vlans mapped -------- --------------------------------------------------------------- 0 1-19,51-79,81-99,101-4094 1 20-50 2 80,100 ------------------------------------------------------------------------- Why do the switches wait until you are finished making changes to MST to commit them, rather that changing MST as you enter commands (like most switch commands)? Verify that you have separate instances of spanning tree running for each MST instance: DLS1#show spanning-tree MST00 Spanning tree enabled protocol mstp Root ID Priority 32768 Address 000a.b8a9.d680 Cost 0 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32768 (priority 32768 sys-id-ext 0) Address 000a.b8a9.d780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Desg FWD 200000 128.9 P2p Fa0/8 Desg FWD 200000 128.10 P2p Fa0/9 Desg FWD 200000 128.11 P2p Fa0/10 Desg FWD 200000 128.12 P2p
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc Fa0/11 Root FWD 200000 128.13 P2p Fa0/12 Altn BLK 200000 128.14 P2p MST01 Spanning tree enabled protocol mstp Root ID Priority 32769 Address 000a.b8a9.d680 Cost 200000 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 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Desg FWD 200000 128.9 P2p Fa0/8 Desg FWD 200000 128.10 P2p Fa0/9 Desg FWD 200000 128.11 P2p Fa0/10 Desg FWD 200000 128.12 P2p Fa0/11 Root FWD 200000 128.13 P2p Fa0/12 Altn BLK 200000 128.14 P2p MST02 Spanning tree enabled protocol mstp Root ID Priority 32770 Address 000a.b8a9.d680 Cost 200000 Port 13 (FastEthernet0/11) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32770 (priority 32768 sys-id-ext 2) Address 000a.b8a9.d780 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- Fa0/7 Desg FWD 200000 128.9 P2p Fa0/8 Desg FWD 200000 128.10 P2p Fa0/9 Desg FWD 200000 128.11 P2p Fa0/10 Desg FWD 200000 128.12 P2p Fa0/11 Root FWD 200000 128.13 P2p Fa0/12 Altn BLK 200000 128.14 P2p Challenge You can modify per-instance MST spanning tree attributes the same way you can modify per-VLAN attributes. Make DLS1 the root of instance 1 and DLS2 the root of instance 2. HINT: Use a question mark on the global configuration command spanning-tree mst ?.
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc END OF LAB FINAL CONFIGS: DLS1#show running-config ! hostname DLS1 ! ! vtp domain CISCO vtp mode transparent ! ! ! ! ! spanning-tree mst configuration name CISCO revision 1 instance 1 vlan 20-50 instance 2 vlan 80, 100 ! spanning-tree mst 1 priority 24576 ! ! vlan 10,20,30,40,50,60,70,80,90,100 ! ! 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 switchport mode trunk ! interface FastEthernet0/11 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/12 switchport trunk encapsulation dot1q switchport mode trunk ! ! end DLS2#show running-config ! hostname DLS2
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc ! ! vtp domain CISCO vtp mode transparent ! ! spanning-tree mode mst ! spanning-tree mst configuration name CISCO revision 1 instance 1 vlan 20-50 instance 2 vlan 80, 100 ! spanning-tree mst 2 priority 24576 ! ! vlan 10,20,30,40,50,60,70,80,90,100 ! ! ! 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 switchport mode trunk ! interface FastEthernet0/11 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/12 switchport trunk encapsulation dot1q switchport mode trunk ! ! end ALS1#show running-config ! hostname ALS1 ! ! vtp domain CISCO vtp mode transparent ! ! spanning-tree mode mst ! spanning-tree mst configuration name CISCO revision 1 instance 1 vlan 20-50
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc instance 2 vlan 80, 100 ! ! vlan 10,20,30,40,50,60,70,80,90,100 ! ! 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 ! ! spanning-tree mode mst ! spanning-tree mst configuration name CISCO revision 1 instance 1 vlan 20-50 instance 2 vlan 80, 100 ! ! vlan 10,20,30,40,50,60,70,80,90,100 ! ! 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 !
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CCNP: Building Multilayer Switched Networks v5.0 - Lab 3-4 Copyright © 2006, Cisco Systems, Inc interface FastEthernet0/12 switchport mode trunk ! ! end
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