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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
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  1. Anonymous
    January 5th, 2017

    @imagination

    “Any particular reason why someone could failed the exam despite doing the configuration as outlined in the dump. A friend of mine got 810 and could determine what went wrong. Any suggestion on the configurations please. He had the AAA+dot1x and lacp labs”

    I did the test yesterday and had the above SIM again believe i didn’t get it right even though I did exactly the same and also tested ping between the 2 SVIs and it worked fine.

    The only thing I can think of though was in the exam an SVI for VLAN 1 on both switches already existed but it was a different IP on switch A – 192.168.1.11 and switch B’s was already there. I tested ping and it pinged, as you would expect fine.

    There is mention of a default gateway on switch B but i didn’t add this as it said no routing. I am hugely frustrated.

    I had the AAA sim also and missed one line “ASW(config)#dot1x system-auth-control” so I am guessing I failed both SIMS thus a score of 701.

  2. navy fascinator
    January 5th, 2017

    I really like your writing style, superb info , thanks for putting up : D.

    https://www.youtube.com/watch?v=0Jb0bNCn5CI

  3. Anonymous
    January 6th, 2017

    is 191q still valid ??
    please send me a valid dump to eryxcs(at)gmail(dot)com

  4. sha123
    January 6th, 2017

    192q still valid?

  5. Patrick
    January 6th, 2017

    Yup 191q still valid. Passed yesterday.

    Sim : HSRP Sim/ dot1x / LACP with STP.

    Thanks for the dumps. Good luck to the rest of the people.

  6. dumps
    January 7th, 2017

    @Patrick Please share what dumps u refereed to
    is it 191Q ?

  7. Anonymous
    January 8th, 2017

    {email not allowed} please send ne 191q dumps

  8. welzatm
    January 9th, 2017

    please send valid questions to me. Email : {email not allowed}

  9. welzatm
    January 9th, 2017

    please send valid questions to me. tpsolesi at g m a i l . com

  10. Anonymous
    January 9th, 2017

    Just passed today, 100% valid.

    Why didn’t you add the vlan 99 in the allowed list ?

  11. ahemd erlrofaie
    January 10th, 2017

    Hi I pass the exam ccnp switching 300-115 yesterday with 979 score (9-1-2017) the questions here is enough , you don’t need to see any other dumps , and this site is still valid .
    but by the way if you have studied the 191 dump , it also valid and you can depend on it completely , so it is your choice to study this site or the 191 dump both are valid.
    Regarding to the simulations it were:
    1-lacp question
    2-aaa dot1x
    3-hsrp question

    Important note:
    Regarding to Lacp question it is important to know that, after creating the port-channel (the logical port) , you have to implement the trunk configuration under the physical interfaces
    You can do that through entering the interface range f0/3-4 and follow the bellow configuration:
    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)#no shutdown

    The reason for that, it because the question ask you to implement all the configuration under the physical interfaces, so configuration under the logical port is not recommended
    I wish for you the best

  12. Anonymous
    January 10th, 2017

    is it just create port-channel 1 enough
    SW-A(config-if)#int port-channel 1
    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)#no shutdown

  13. ahemd erlrofaie
    January 11th, 2017

    Hi every one for any one need the latest pass4sure dumps for ccnp routing , ccnp switching , ccnp tshoot
    Send email on ahmedrofaii at gmail dot com
    They are valid and for free
    Also I have the 191 dump for ccnp switching
    I wish good luck for you all

  14. Mahmoud
    January 11th, 2017

    Just passed 300-115 today with 954, 191q still valid,

    LACP with STP

    SW-B

    no need to config vlan 1, because it’s already configured with ip address 192.168.1.11/24
    and also it’s configured on SW-A with ip address 192.168.1.10/24

    but I have configured ip default-gateway on both switches, with ip address 192.168.1.1/24, show cdp neighbor doesn’t show the ip of the router, so i just made like that, and it worked well and all switches can ping the router and can ping each other,

    – I put the configuration under physical interface ” fa0/3 and 0/4 ” as the mentioned in the exam that we have to put it under physical interface level,

    – vlan 11,12 and 13 already configured on SW-A

    I started configuration with SW-B first, I just made that cause when I was trying the lap on the Packet tracer, if I started with SW-A it will give me error with port ” fa0/3 and fa0/4 ” on SW-B that dtp is on, and the port is not compatible, I just was afraid if that would happened on the exam too, so I started configure SW-B first ….. so maybe it’s meaningless and you can start with any switch of them …

    * AAA Lab is the same as here!

    * HSRP lab

    you should focus on the question, it’s almost the same question but sometimes ther change the port number like ” fa0/0 instead of fa0/1 “, exchange between R1 and R2.

    Best of luck for all of you.

  15. Anonymous
    January 14th, 2017

    in the lab can someone confirm what statement 3 should be? I keep getting the error Statement 3 is not correct!

  16. kokwkz
    January 17th, 2017

    dears
    how to make sure after i applied the configuration is correct in this lap under physical interface ??

  17. Yahia
    January 17th, 2017

    dump 191q still valid labs “LACP , AAA ” , HSRP sim

  18. Anonymous
    January 18th, 2017

    dear Yahia
    For the LACP with STP – did the questions asked to apply the commands ONLY in physical port?
    AAA dot1x – Was the question asked to used ONLY numbered access-list?
    Please help

  19. HANI AL-OLOFI
    January 19th, 2017

    @Anonymous YES ,
    For the LACP with STP – the questions asked to apply the commands ONLY in physical ports.
    AAA dot1x – the question asked to used ONLY numbered access-list.

  20. F…n Exam
    January 19th, 2017

    Cisco exams are so flaky – one miss or a mess up can deduct huge points – The AAA sim on the exam cost me the ENTIRE exam due to the VLAN section – it would not accept my input and even after using the ? I seen no other options , not even the

    So I missed the vlan access-map 10…. because the match ip address area.. I could not go beyond IP – I did not have an ADDRESS nor did I Have a NUMBER I can input -the simulator asked for AN IP ADDRESS ?
    when I tried match ip address it came me the ^ over address and said it needed to be an IP Address !?!?!?!?! WHAT THE F>>>> CK!!?!??!!?

    is this a bug in the simulator because all you that claim to have passed – did not have this same f….n issue!

  21. God is good
    January 19th, 2017

    this is the explanation
    DSW1(config-access-map)#match ip address 10 (syntax: match ip address {acl_number | acl_name})

  22. gr8t
    January 20th, 2017

    okay i’ve got a VLAN 99 mismatch for FA0/3 i’m using pkt, please help

  23. gr8t
    January 20th, 2017

    okay i’ve got a VLAN 99 mismatch for FA0/3 for LACP SIM i’m using pkt, please help

  24. gr8t
    January 20th, 2017

    Invalid input detected at SWITCH B when i type “swicthport trunk encapsulation dot1q”, cant issue this command for LACP SIM, Please help

  25. 300-115
    January 20th, 2017

    @HANI AL-OLOFI,
    In case if the configuration are applied on the physical interfaces only, did u checked the applied configuration has been reflected to the port-channel?
    Did u checked the ether-channel status at last? Were they up by configuring on physical interfaces only?

    Further did u configured ip default-gatway in Sw1 and/or SW2?

  26. Anonymous
    January 20th, 2017

    @gr8t
    The newer switches don’t require the “switchport trunk encapuslation dot1q” command. They stopped supporting ISL. Also the vlan mismatch can be solved with “switchport trunk native vlan XXX”.

  27. Anonymous
    January 22nd, 2017

    why when I try to practice this lap in packet tracer its given the port f0/3-4 its not compatible any solution for this error ..

  28. batman
    January 22nd, 2017

    why when I try to practice this lap in packet tracer its given the port f0/3-4 its not compatible any solution for this error ..

  29. ShoNuff
    January 22nd, 2017

    Can someone send me the most recent dump to {email not allowed}

  30. gr8t
    January 23rd, 2017

    Hi guys. For AAA dot1x Sim, do we need to configure vlan 20 or is it already pre-configured for us in the exam and just need to carry on with the configuration as follows

    ASW(config)#aaa new-model
    ASW(config)#radius-server host 172.120.40.46 key rad 123 [provided IP in the exam]
    ASW(config)#aaa authentication dot1x defautl group radius
    ASW(config)#dot1x system-auth-control
    ASW(config)#int fa0/1
    ASW(config-if)#dot1x port-control auto
    ASW(config-if)#switchport mode access [was already there]
    ASW(config-if)#switchport access vlan 20
    ASW(config-if)#no shut
    ASW(config-if)#exit
    ASW#copy run start……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

    Please help

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