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LACP with STP Sim

October 11th, 2018 in Lab Sim, LabSim Go to comments

Question

You work for SWITCH.com. They have just added a new switch (SwitchB) to the existing network as shown in the topology diagram.

LACP_STP_topology.jpg

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.

Note: There is a requirement that the trunk between SwitchA and SwitchB must be configured under physical interfaces, not logical port-channel interface

Answer and Explanation:

We post the initial configuration of Sw-A & Sw-B here for your reference, you can try solving this sim by yourself before reading the asnwers below:

Initial Configuration (useless lines have been removed)

SwA:
hostname Sw-A
!
vtp mode transparent
!
spanning-tree mode rapid-pvst
!
vlan 98
!
vlan 99
 name TrunkNative
!
interface FastEthernet0/1
 switchport access vlan 98
 switchport mode access
!
interface FastEthernet0/3
 switchport access vlan 98
 switchport mode access
!
interface FastEthernet0/4
 switchport access vlan 98
 switchport mode access
!
interface Vlan1
 no ip address
 shutdown
!
end
Sw-B:
hostname Sw-B
!
vtp mode server
!
spanning-tree mode pvst
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface Vlan1
 no ip address
 shutdown
!
ip default-gateway 192.168.1.1
!
end

Solution

SW-A (close to router)
Note: If Sw-A does not have Vlan 11, 12, 13 we have to create them first with command “SW-A(config)#vlan 11,12,13”
SW-A(config)#vlan 21
SW-A(config)#vlan 22
SW-A(config)#vlan 23
SW-A(config)#spanning-tree vlan 11-13,21-23 root primary

SW-A(config)#interface range fa0/3 – 4
SW-A(config-if)#no switchport mode access
SW-A(config-if)#no switchport access vlan 98 (These two commands must be deleted to form a trunking link)
SW-A(config-if)#switchport trunk encapsulation dot1q //Some reports say that this command does not work on SW-A so just ignore it
SW-A(config-if)#switchport mode trunk
SW-A(config-if)#switchport trunk native vlan 99
SW-A(config-if)#switchport trunk allowed vlan 1,21-23
SW-A(config-if)#channel-group 1 mode active
SW-A(config-if)#channel-protocol lacp
SW-A(config-if)#no shutdown

Note: In practical when you apply commands under “interface port-channel 1”, the same commands will be automatically applied to the physical member interfaces (of port-channel 1) so you don’t need to type them under physical member interfaces again. But in this exam you should configure everything under physical interfaces as there is a requirement to do so.

——————————————————————————————–

SW-B (far from router)
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
SW-B(config-vlan)#name TrunkNative // not necessary to name it but just name it same as SwitchA
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 //Same as Sw-A

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
SW-B(config-if)#switchport trunk encapsulation dot1q
SW-B(config-if)#switchport mode trunk
SW-B(config-if)#switchport trunk native vlan 99 //this command will prevent the “Native VLAN mismatched” error on both switches
SW-B(config-if)#switchport trunk allowed vlan 1,21-23
SW-B(config-if)#channel-group 1 mode passive //mode passive because “SwitchA controlling activation”
SW-B(config-if)#channel-protocol lacp
SW-B(config-if)#no shutdown

Note: For Sw-B we have to set the 802.1q trunking protocol (switchport trunk encapsulation dot1q) before converting it into a trunk because it is a 3500 series (or higher) switch which supports both ISL and 802.1Q and we have to explicitly set which trunking protocol to be used. Sw-A is a 2900x series (or lower) switch and does not support ISL trunking protocol (802.1Q is the only supported trunking protocol) so we can apply “switchport mode trunk” directly.

———————————————————

Some guidelines for configuring SwitchA & SwitchB:

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
SW-A(config)#spanning-tree vlan 11-13,21-23 root primary

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.
vlan …
name …
(VLANs must be created on both switches if not exist)
interface range fa0/x – y
switchport mode access
switchport access vlan
spanning-tree portfast
– SwitchB VTP mode needs to be the same as SwitchA. vtp mode transparent
– SwitchB must operate in the same spanning tree mode as SwitchA. spanning-tree mode rapid-pvst
– 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.
interface vlan 1
ip address 192.168.1.11 255.255.255.0

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.
SW-A(config)#interface range fa0/3 – 4
SW-A(config-if)#no switchport mode access
SW-A(config-if)#no switchport access vlan 98
Note: Two above commands must be deleted first to form a trunking link.

Although the first requirement asks us to configure trunking but we can ignore this task because we only need to configure trunking under their Port-channel (in the next task)

– 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:
SW-A(config)#interface range fa0/3 – 4
SW-A(config-if)#no switchport mode access
SW-A(config-if)#no switchport access vlan 98
SW-A(config-if)#switchport trunk encapsulation dot1q
SW-A(config-if)#channel-group 1 mode active
SW-A(config-if)#channel-protocol lacp
SW-A(config-if)#no shutdown
– Trunking should be unconditional and Vlans 1, 21, 22 and 23 should tagged when traversing the trunk link:
SW-A(config-if)#switchport mode trunk //unconditional trunking
SW-A(config-if)#switchport trunk native vlan 99 //this command will prevent the “Native VLAN mismatched” error on both switches and make other VLANs to be tagged
– Propagation of unnecessary broadcasts should be limited using manual pruning on this trunk link.
SW-A(config-if)#switchport trunk allowed vlan 1,21-23
—————————————
SW-B(config)#interface range Fa0/3 – 4
SW-B(config-if)#switchport trunk encapsulation dot1q
SW-B(config-if)#switchport mode trunk
SW-B(config-if)#switchport trunk native vlan 99 //this command will prevent the “Native VLAN mismatched” error on both switches
SW-B(config-if)#switchport trunk allowed vlan 1,21-23
SW-B(config-if)#channel-group 1 mode passive
SW-B(config-if)#channel-protocol lacp
SW-B(config-if)#no shutdown

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 has 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.

The following “show” commands should be used to verify the configuration:

+ show vlan (check if the VLANs and VLAN names are correct)
+ show interface trunk (check if physical and port-channel is in trunking mode; the native VLANs on two switches match; allowed VLANs are correct)
+ show etherchannel summary (check Etherchannel status and LACP mode)
+ show ip interface brief (make sure the configured ports are up/up)
+ show spanning-tree (check STP mode)
+ show spanning-tree detail (can be used to check PortFast on specific interface but not sure if this command is supported in the exam)
+ show vtp status
+ show run (verify everything again)

Other lab-sims in this site:

MLS and EIGRP Sim
VTP Lab 2
VTP Lab
Spanning Tree Lab Sim
AAAdot1x Lab Sim

Comments
Comment pages
1 63 64 65 52
  1. okratom
    January 11th, 2019

    I am planning to take CCNP Switch Exam soon, could anyone kindly pls send me the latest dump? thanks … {email not allowed}

    Blessed

  2. okratom
    January 11th, 2019

    I am planning to take CCNP Switch Exam soon, could anyone kindly pls send me the latest dump? thanks
    okratom @ gmail dot com

    Blessed

  3. coolestartist
    January 11th, 2019

    Way to much info to cover with current brain dumps. Just failed trying to re-cert CCNP.
    ONLY ONE CONFIG SIM – portchannel vlan config sim
    ONE SIMLET- HSRP with 4 questions
    ZERO DRAG AND DROP QUESTIONS
    Most Q&A was SPAN, RSPAN, VTPv1, v2 and v3
    I am a LAN wireless engineer. Design, config and install 9500, 9300 switch stacks and many others. Most question DO NOT apply to every day production environments. Cisco pushing crap that no one uses on production environments.
    My best advice, wait till new test version comes out with new test code other than 300-115. I was trying to prep and cover over 400 questions with no clear idea whats on the test.

  4. thovas
    January 13th, 2019

    I passed the exam 2 days ago with 928/1000. I was tested to the above lab, so I can assure that the answer provided is correct. There was explicit instruction that trunk properties between the 2 switches should be configured on the interfaces and not inside ether-channel config.
    From the sims I was tested for HSRP Sim.
    No drag and drop questions.
    Very few questions were new, but the concept is pretty much the same with the questions provided here. So I believe if someone understands deeply the concepts then he can answer most of the questions.
    You need to remember all FHRP multicast addresses, UDP ports and timers, TACACS&RADIUS characteristics, CDP – LLDP timers.
    The scoring mechanism is less strict than I thought. There were many questions that I was not 100%sure for my answer and I believed that I would fail, so don’t lose hope during the test!

  5. Nada Rashed
    January 16th, 2019

    You can make all both switches port channel as active active and Swb will ping the router :)

  6. dd
    January 17th, 2019

    Nada Rashed “…with SwitchA controlling activation.” => So no, there should by active (Switch A) and pasive (switch B)

  7. muchmu
    January 18th, 2019

    @thovas Can you tell us what you used as the dumps?

  8. Anonymous
    January 19th, 2019

    Can anyone send me latest dump?
    E-mail- Mehedihussain@hotmail. com

  9. jack
    January 22nd, 2019

    thanx Thovas for the update can you please share the dumps at {email not allowed}

  10. sam
    January 23rd, 2019

    Hi,

    Need help please in LACP STP lab.
    On packet tracer when i apply “switchport trunk allowed vlan 1,21-23” under physical interfaces (all four of them, 2 in SWA and 2 in SWB) the command doesn’t show up in port channel.
    According to the instructions. we cannot configure anything on port channel and only configure physical interfaces.
    If i put that command on port-channel it works well and remove vlans other than 1,21-23 on trunk. But doing it on physical interface is not giving the same output.

    PLEASE HELP.
    I think its a packet tracer bug can anyone else confirm??

  11. Anonymous
    January 24th, 2019

    Will you please send the latest dump to fritzman22 @ yahoo.com!

    Thank you!

  12. Anonymous
    January 26th, 2019

    please send the latest dump to abehtimtam @ gmail. com

  13. Fridi
    January 26th, 2019

    Did my exam today and passed. Got LACP, HSRP and VTP v3 labs.
    In lacp make sure you apply trunk protocol on interfaces and do the Port channel/channel group command right at the end otherwise will give you error.

  14. Anonymous
    January 26th, 2019

    @Sam: In the 9tut lab they have already configured Port channel that’s why giving you error. Make sure you do trunking and native vlan allowed command on INT RANGE FA 0/3-4
    Once you are done with everything, create channel group and port channel. In exam if you create port channel first and apply the commands they wont wont work..

  15. Zub
    January 28th, 2019

    .

    any suggestion from who have passed recently would really help on this platform please advise which Labs to prepare more and expected to come mostly in exam.

    Thanks.

  16. Fridi
    January 29th, 2019

    Did my exam 3 days ago. got LACP configuration lab and 2 TShoots. 1. HSRP 2. Vtp V3
    very easy. Make sure you follow the exact same steps as in 9tut for LACP lab otherwise it wont work. I tried to do trunking on Port Channel instead of interfaces and was not working for me. Rest it shud be easy..

  17. Jackie
    February 3rd, 2019

    In LACP and STP Lab
    ===============
    Lab states we should be able to ping GW 192.168.1.1 through SW-A but SW-A l3 interface VLAN1 is down with no ip address ? Unsure what this is about. Please can some one clarify.

  18. Frem-ont
    February 3rd, 2019

    JUST 20 $, Way your Success.

    CCNA R&S
    200-125 CCNA = 573 Q&As DUMPs + LABs
    100-105 ICND1 = 347 Q&As DUMPs + LABs
    200-105 ICND2 = 591 Q&As DUMPs + LABs
    CCNP R&S
    ROUTE = 305 Q&As DUMPS + LABs
    SWITCH = 287 Q&As DUMPs + LABs
    TSHOOT = 171 Q&As DUMPs + Tickets
    CCIE R&S
    400-101 WRITTEN = 100 Q&As DUMPS

    At web :
    t2m.io/qkhTw5dQ

  19. Cyclone
    February 3rd, 2019

    Way your Success. :)

    CCNA R&S
    200-125 CCNA = 573 Q&As DUMPs + LABs
    100-105 ICND1 = 347 Q&As DUMPs + LABs
    200-105 ICND2 = 591 Q&As DUMPs + LABs
    CCNP R&S
    ROUTE = 305 Q&As DUMPS + LABs
    SWITCH = 287 Q&As DUMPs + LABs
    TSHOOT = 171 Q&As DUMPs + Tickets
    CCIE R&S
    400-101 WRITTEN = 100 Q&As DUMPS

    At web :
    t2m.io/qkhTw5dQ

  20. Anonymous
    February 5th, 2019

    Rule says:
    Configuration Requirements for SwitchA
    – The STP configuration modes on SwitchA should not be modified.

    Maybe we can’t enter this command
    SW-A(config)#spanning-tree vlan 11-13,21-23 root primary

    Maybe we must enter lower stp priority in Switch B ? For vlan 11-13 SwitchA already root.

  21. 7aniche
    February 6th, 2019

    I don’t see why we configure VLAN 99 as native vlan, for me removing access mode from SWA will stop native vlan mismatch error.

  22. trueteller
    February 7th, 2019

    @Anonymous

    They are asking about mode which is pvst+, rstp, mst etc. Changing root doesn’t change mode.

  23. Anonymous
    February 7th, 2019

    Thank God I’ve passed my exam today, lacp simulation, hsrp tshoots, glbp, tacacs and radius cdp and lldp drag and drop. Good luck everyone who planned to take exam.

  24. qwe
    February 11th, 2019

    anybody have CCNP (switching) valid dumps so please share on this email abdulrehmandwp @ gmail dot com

  25. Layo_WannabeCCNP
    February 11th, 2019

    Can anyone send me the latest dumbs please:
    {email not allowed}

  26. Layo_WannabeCCNP
    February 11th, 2019

    Can anyone send me the latest dumbs please:
    layo88 @ gmail . com

  27. Pass4sure
    February 14th, 2019

    I am planing to take CCNP exams soon. Can you help me with CCNP dumps please
    prabhus81 @ gmail dot com

  28. YKB
    February 15th, 2019

    I’ve passed the switch exam today with 918 Score.
    LACP and HSRP labs were there. got few drag and drop questions

  29. qwe
    February 18th, 2019

    Dear YKB,

    please share the dumps n this email abdulrehmandwp @ gmail dot com

  30. ComSis
    February 19th, 2019

    Hi all, just passed my CCNP switching today. Thanks to tut. Some of the questions are the same,I had the LACP sim and HSRP. Some questions have their answers reframed. Study the questions and the training guides but you may need to know some more details on the topics.
    Thanks to Certprepare!!

  31. Neng
    February 20th, 2019

    Hi,

    I’m planning to go for my CCNP switch, would you please share the latest dumps please my email is: {email not allowed}

  32. Anonymous
    February 20th, 2019

    Hi,

    I’m planning to go for my CCNP switch, would you please share the latest dumps please my email is: nengbabak1 @ gmail dot com

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