LACP with STP Sim
Question
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.
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
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)#ip default-gateway 192.168.1.1 (you can get this IP from SW-A with command show cdp neighbour detail) // not sure about this 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
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: |
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.
Other lab-sims in this site:
MLS and EIGRP Sim
VTP Lab 2
VTP Lab
Spanning Tree Lab Sim
AAAdot1x Lab Sim
Hi why is it needed to configure the switchmode trunk ,switchport trunk allowed, switchport trunk native vlan in the physical interface?
Which part of the question states that?
Has someone tried configuring those in etherchannel in the exam?
@Confuse guy
Do I need to configure vlan 11-13 at switch B? If yes, what is the purpose. Thanks.
just passed…
– In the exam both ports f0/3 – 4 on Switch B were shutdown.
– One of the switches is a different model which only can do dot1q. So it doesnt accept the sw trunk encap dot1q command. You get an error message anyway when you try to switch the mode and the encap mode is in auto.
– Also there was no ip default-gateway configured on both switches. Dunno If u have to add this in – the exam ( in real life you would)
The port config has to be done in the physical interfaces F0/3 – 4. It is a requirement in the exam question
Vlan 11-3 are already configured on Switch B, but 21,22,23 are missing. Since u have to make Switch B the span root for those vlans you need to add those….
@IVE
how much you get in the exam?
For this question in think we should allow Vlan 99 the native vlan to transverse o the trunk link for the VTP to work
@Lateef, no, the requirement says that you should only allow specific VLANS and native(99) is not listed there
I passes the exam two weeks ago and had the exactly the same simulation.
You dont need to add vlan 99, but you have to make it native. Unless you make it native you will have two problems;
1) constant log mesages about vlan mismatch
2) Etherchannel from interfaces 3 and 4 will show as down.
Once you make vlan 9 native on both sides (have to create it on one side ) and do “shut/no shut) on interface range, etherchannel changed state will be up and log messages will stop
just passed the exam, but on switchA i didn’t have encapsulate “option”, only on switchB
like
SW-B(config-if)#switchport trunk encapsulation dot1q
and
SW-A(config-if)#switchport trunk (native|allowed)
although the SIMs are valid, good like!
hello
latest valid CCNP Exam questions
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@Nor u are talking about a connection between switch A and B fa0/3-4
Please help
On switch A
fa0/3-4
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
switchport mode trunk
channel-protocol lacp
channel-group 1 mode active
on sw b
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
switchport mode trunk
channel-protocol lacp
channel-group 1 mode passive
but still got the native vlan mismatch error
Hello, can any one please explain why there is vlan mismatch error also lab requirtment is
allow vlan 1,21-23 on trunk so my question is when we confiugure native vlan 99 and its not in allowed vlan how will native vlan 99 travel on trunk???
it should be like this . switchport trunk vlan allowed 1,21-23,99
please explain
many thanks
@ CCNP
NATIVE VLAN IS FOR CONTROL TRAFFIC (UNTAGGED) AND DOES NOT REQUIRE TO BE INCLUDED IN THE “SWITCHPORT TRUNK ALLOWED….” COMMAND.
Passed 9xx, Big thnx to this site and commentators. LBS, AAA and LACP.
@Rock
did you get vlan mismatch error in Lab??
passed 9–, labs AAA and LACP, simulation VTP V3 , DNDs were difference CDP & LLDP, STP and new VRRP V1,V2 and V3 Difference apart from the dumps.. some new questions regarding VRRP and GLBP (concept only). note that some of the questions around 6-8 were rephrased. 432 ete dump is still valid. Also in LACP with STP lab, on Fa0/3-4 trunk encapsulation does not work, the only option was (Native|allowed).
best of luck
Hi all,
could anyone please share the latest dumps. config101 at gmail dot com
Thanks
no vlan mismatch error, make sure native vlan 99 is properly set in either side.
@ AB please share dumps siphiwekay13 at gmail dot com
Hi;
Those who have sent an email requesting dumps please email me again on dumpsfree4all at gmail dot com. I have kept the download link ready for the dumps; will give to all who request through email. I have purchased these dumps and do not guarantee for its correctness, i am just helping you by sharing it.
SO TRY AT YOUR OWN RISK AND DON’T BLAME ME IF YOU FAIL.
PRAY FOR PEACE IN THE WORLD.
thanks
DIJAS
As promised i have emailed the link for 300-115 to those who have requested by email, its the latest updated one. Please don’t held me responsible if you fail, i am just sharing this to help you. So TRY AT YOUR OWN RISK.
Pray for peace in the world.
thanks
DIJAS
@ ROCK please share dumps siphiwekay13 at gmail dot com
Hello Guys
17th Apr Latest Update the new CCnp dumps Exam Questions
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hi guys,
all the dumplings in there are invalid. The dump and premium dump found in examcollection is invalid for them.
I got a new entry and got 750 points, which is really annoying.
@DIJAS
To check if you could send me the . ccnp300 dot outlook com
thank you
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Note: There is a requirement that the trunk between SwitchA and SwitchB must be configured under physical interfaces, not logical port-channel interface
its already says int range fa0/3-4? which is physical??? there i no logical port-channel int.
don’t pay a penny its all for FREE. Real dumps to pass exams. Just email me dumpsfree4all at gmail dot com
Pray for peace in the world.
Dijas
Hi every1. I just passed CCNP 300-115. On a GODLY grace. 798. passed. I cannot tell you to use my dump. For it was just a few Objectives that came out from it. Sim: AAA; LACP & STP; VTP V3.
Pls choose your own dump. No1 is guarantee. Study and know it very well.
Why there is no vlan 1 configuration on SWA?
Why vlans 11-13 must be configured on both SW?
Hello Team !
Thanks to God. I pass the exam just few minutes.
All questions were from the dumps
My email : coopersaphir @ gmail . com
Contact me to get the dumps !
Good luck Team
Can you plz send dumps/material on {email not allowed} regards
Hi,
please email me latest dumps for 300-115
ramyashour1234 @ gmail (dot) com
Thanks
I get a 92% in my exam today. very happy
Just passed with an 881. This SIM is still 100% accurate.
What Labs, Simlets, DND are actual in the exam? Which questions do you remember out of the exam?
Guys I keep getting this error on Pkt tracer command rejected:an interface must be configured to the access or trunk modes to be configured to Nonegotiate.whenevr
I type in the no switchport mode access command
i got error on both switch, however, if i remove the “switchport trunk native vlan 99” which will work fine and no more pop up. im sure both SW has same vlan command. also i did put command on portchannel since it said “etherchannel must be config only on physical interface”
help~~
here is the pop up.
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on Port-channel 1 (99), with Sw_B FastEthernet0/3 (1).
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on Port-channel 1 (99), with Sw_B FastEthernet0/4 (1).
@yesman
do You have a Vlan 99 on both switch ?
In Sim Swich A has already Vlan 99, but on Switch B there wasn’t Vlan 99 – it must be created.
@Grzesiekwie,
Yes, i did on Sw B
hostname Sw_B
!
enable password Cisco
!
!
!
ip name-server 0.0.0.0
!
vtp mode transparent
!
spanning-tree mode rapid-pvst
!
vlan 11
!
vlan 12
!
vlan 13
!
vlan 21
name Marketing
!
vlan 22
name Sales
!
vlan 23
name Engineering
!
vlan 99
name TruckNative
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
channel-protocol lacp
channel-group 1 mode passive
switchport mode trunk
!
interface FastEthernet0/4
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
channel-protocol lacp
channel-group 1 mode passive
switchport mode trunk
!
~~~~
interface FastEthernet0/9
switchport trunk allowed vlan 21
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/10
switchport trunk allowed vlan 21
switchport mode access
spanning-tree portfast
!
~~~~~
interface FastEthernet0/13
switchport trunk allowed vlan 22
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/14
switchport trunk allowed vlan 22
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/15
switchport trunk allowed vlan 23
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/16
switchport trunk allowed vlan 23
switchport mode access
spanning-tree portfast
!
~~~~~
interface Port-channel 1
switchport mode trunk
!
interface Vlan1
ip address 192.168.1.11 255.255.255.0
!
do i have to put the native vlan 99 on port channel? i assume we dont have to do it since MOD2 only asking to config on Physical interface.
any suggest?
valid June-2018
I was getting this error “CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on Port-channel 1 (1), with Sw_A FastEthernet0/4 (99).”
I configured native vlan 99 on the port channel and the error was cleared.
interface port-channel 1
switchport trunk native vlan 99