Lab Simulation - LACP with STP Sim
You work for SWITCH.com. They have just added a new switch (SwitchB) to the existing network as shown in the topology diagram.
RouterA is currently configured correctly and is providing the routing function for devices on SwitchA and SwitchB. SwitchA is currently configured correctly, but will need to be modified to support the addition of SwitchB. SwitchB has a minimal configuration. You have been tasked with competing the needed configuring of
SwitchA and SwitchB. SwitchA and SwitchB use Cisco as the enable password.
Configuration Requirements for SwitchA
The VTP and STP configuration modes on SwitchA should not be modified.
- SwitchA needs to be the root switch for vlans 11, 12, 13, 21, 22 and 23. All other vlans should be left are their default values.
Configuration Requirements for SwitchB
- Vlan 21
Name: Marketing -
will support two servers attached to fa0/9 and fa0/10
- Vlan 22
Name: Sales -
will support two servers attached to fa0/13 and fa0/14
- Vlan 23
Name: Engineering -
will support two servers attached to fa0/15 and fa0/16
- Access ports that connect to server should transition immediately to forwarding state upon detecting the connection of a device.
- SwitchB VTP mode needs to be the same as SwitchA.
- SwitchB must operate in the same spanning tree mode as SwitchA
- No routing is to be configured on SwitchB
- Only the SVI vlan 1 is to be configured and it is to use address 192.168.1.11/24
Inter-switch Connectivity Configuration Requirements
- For operational and security reasons trunking should be unconditional and Vlans 1, 21, 22 and 23 should tagged when traversing the trunk link.
- The two trunks between SwitchA and SwitchB need to be configured in a mode that allows for the maximum use of their bandwidth for all vlans. This mode should be done with a non-proprietary protocol, with SwitchA controlling activation.
- Propagation of unnecessary broadcasts should be limited using manual pruning on this trunk link.
 

A. See the explanation














 

Suggested Answer: A

SW-A (close to router)
SW-A#configure terminal -
SW-A(config)#spanning-tree vlan 11-13,21-23 root primary
SW-A(config)#vlan 21 -
SW-A(config-vlan)#name Marketing
SW-A(config-vlan)#exit -
SW-A(config)#vlan 22 -
SW-A(config-vlan)#name Sales -
SW-A(config-vlan)#exit -
SW-A(config)#vlan 23 -
SW-A(config-vlan)#name Engineering
SW-A(config-vlan)#exit -
SW-A(config)#interface range Fa0/3  4
SW-A(config-if-range)#no switchport mode access
(These two commands must be deleted to form a trunking link)
SW-A(config-if-range)#no switchport access vlan 98
(cannot issued this command on this switch, but dont worry coz I still got 100%)
SW-A(config-if-range)#switchport trunk encapsulation dot1q
SW-A(config-if-range)#switchport mode trunk
SW-A(config-if-range)#switchport trunk native vlan 99
SW-A(config-if-range)#switchport trunk allowed vlan 1,21-23
SW-A(config-if-range)#channel-group 1 mode active
SW-A(config-if-range)#channel-protocol lacp
SW-A(config-if-range)#no shutdown
SW-A(config-if-range)#end -
SW-B (far from router)
SW-B#configure terminal -
SW-B(config)#vlan 21 -
SW-B(config-vlan)#name Marketing
SW-B(config-vlan)#exit -
SW-B(config)#vlan 22 -
SW-B(config-vlan)#name Sales -
SW-B(config-vlan)#exit -
SW-B(config)#vlan 23 -
SW-B(config-vlan)#name Engineering
SW-B(config-vlan)#exit -
SW-B(config)#vlan 99 -
not necessary to name it but just name it same as SwitchA
SW-B(config-vlan)#name TrunkNative //
SW-B(config-vlan)#exit -
SW-B(config)#interface range Fa0/9  10
SW-B(config-if-range)#switchport mode access
SW-B(config-if-range)#switchport access vlan 21
SW-B(config-if-range)#spanning-tree portfast
SW-B(config-if-range)#no shutdown
SW-B(config-if-range)#exit -
SW-B(config)#interface range Fa0/13  14
SW-B(config-if-range)#switchport mode access
SW-B(config-if-range)#switchport access vlan 22
SW-B(config-if-range)#spanning-tree portfast
SW-B(config-if-range)#no shutdown
SW-B(config-if-range)#exit -
SW-B(config)#interface range Fa0/15  16
SW-B(config-if-range)#switchport mode access
SW-B(config-if-range)#switchport access vlan 23
SW-B(config-if-range)#spanning-tree portfast
SW-B(config-if-range)#no shutdown
SW-B(config-if-range)#exit -
SW-B(config)#vtp mode transparent
SW-B(config)#spanning-tree mode rapid-pvst
(you can get this IP from SW-A with command show cdp neighbour detail) // not sure about this
SW-B(config)#ip default-gateway 192.168.1.1
command because the question says "No routing is to be configured on SwitchB".
SW-B(config)#interface vlan 1 -
SW-B(config-if)#ip address 192.168.1.11 255.255.255.0
SW-B(config-if)#no shutdown -
SW-B(config-if)#exit -
SW-B(config)#interface range Fa0/3  4
(yes I can issued this command on this switch)
SW-B(config-if-range)#switchport trunk encapsulation dot1q
SW-B(config-if-range)#switchport mode trunk
SW-B(config-if-range)#switchport trunk native vlan 99
SW-B(config-if-range)#switchport trunk allowed vlan 1,21-23
//mode passive because "SwitchA controlling activation"
SW-B(config-if-range)#channel-group 1 mode passive
SW-B(config-if-range)#channel-protocol lacp
SW-B(config-if-range)#no shutdown
SW-B(config-if-range)#end -
 <img src="https://www.examtopics.com/assets/media/exam-media/01585/n27570200002.png" alt="Reference Image" />
 <img src="https://www.examtopics.com/assets/media/exam-media/01585/n27570200001.png" alt="Reference Image" />
You may have to configure Interface Port-Channel on both switches. Check the configuration first, if it does not exist, use these commands: interface port-channel1 switchport mode trunk
//this command will prevent the "Native VLAN mismatched" error on both switches switchport trunk native vlan 99 switchport trunk allowed vlan 1,21-23,99
Some notes for this sim:
+ You should check the initial status of both switches with these commands: show vtp status (transparent mode on switchA and we have to set the same mode on switchB), show spanning-tree [summary] (rapid-pvst mode on switchA and we have to set the same mode on switchB), show vlan (check the native vlan and the existence of vlan99), show etherchannel 1 port-channel and show ip int brief (check if Port-channel 1 has been created and make sure it is up), show run (to check everything again).
+ When using "int range f0/x - y" command hit space bar before and after "-" otherwise the simulator does not accept it.
+ You must create vlan 99 for the switchB. SwitchA already have vlan 99 configured.
+ At the end, you can try to ping from SwitchB to RouterA (you can get the IP on RouterA via the show cdp neighbors detail on SwitchA), not sure if it can ping or not. If not, you can use the "ip default-gateway 192.168.1.1" on SwitchB.
+ The name of SwitchA and SwitchB can be swapped or changed so be careful to put your configuration into appropriate switch.

This question is in 300-115 Implementing Cisco IP Switched Networks (SWITCH) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate





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