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 //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: |
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
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Hi Friends,
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Thank you.
Pass on 13th march. My lab is HRSP and AAA dot1q. you should study them well.
Few new questions, dump valid. Thanks certprepare!
====
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Hello.
with this configuration it should be correct.
Can you verify?
SWITCH-A# show running-config
!
hostname SWITCH-A
!
vtp mode transparent
vtp version 2
!
spanning-tree mode rapid-pvst
spanning-tree vlan 11-13,21-23 priority 24576
!
vlan 21
name Marketing
!
vlan 22
name Sales
!
vlan 23
name Engineering
!
vlan 99
name TrunkNative
!
interface Port-channel1
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
switchport mode trunk
!
interface FastEthernet0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
switchport mode trunk
channel-protocol lacp
channel-group 1 mode active
!
interface FastEthernet0/4
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
switchport mode trunk
channel-protocol lacp
channel-group 1 mode active
!
interface Vlan1
no ip address
shutdown
SWITCH-B# show running-config
!
hostname SWITCH-B
!
vtp mode transparent
vtp version 2
!
spanning-tree mode rapid-pvst
!
vlan 21
name Marketing
!
vlan 22
name Sales
!
vlan 23
name Engineering
!
vlan 99
name TrunkNative
!
interface Port-channel1
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet1/0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 1 mode passive
!
interface GigabitEthernet1/0/4
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 1 mode passive
!
interface GigabitEthernet1/0/9
switchport access vlan 21
switchport mode access
spanning-tree portfast!
!
interface GigabitEthernet1/0/10
switchport access vlan 21
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/13
switchport access vlan 22
switchport mode access
spanning-tree portfast!
!
interface GigabitEthernet1/0/14
switchport access vlan 22
switchport mode access
spanning-tree portfast!
!
interface GigabitEthernet1/0/15
switchport access vlan 23
switchport mode access
spanning-tree portfast!
!
interface GigabitEthernet1/0/16
switchport access vlan 23
switchport mode access
spanning-tree portfast!
!
interface Vlan1
ip address 192.168.1.11 255.255.255.0
!
ip default-gateway 192.168.1.1
————————————-
SWITCH-B#sh etherchannel summ
Flags: D – down P – in port-channel
I – stand-alone s – suspended
H – Hot-standby (LACP only)
R – Layer3 S – Layer2
U – in use f – failed to allocate aggregator
u – unsuitable for bundling
w – waiting to be aggregated
d – default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
——+————-+———–+———————————————-
1 Po1(SU) LACP Gig1/0/3(P) Gig1/0/4(P)
———————————–
SWITCH-A#sh etherchannel summary
Flags: D – down P – in port-channel
I – stand-alone s – suspended
H – Hot-standby (LACP only)
R – Layer3 S – Layer2
U – in use f – failed to allocate aggregator
u – unsuitable for bundling
w – waiting to be aggregated
d – default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
——+————-+———–+———————————————-
1 Po1(SU) LACP Fa0/3(P) Fa0/4(P)
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I passed the exam 300-115 with 829, there were like 5 new questions. I got STP, HSRP simulations
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Hi can someone kindly please forward valid 300-115 switching dump, i had an invalid dump it cost me money R4021 and a low score of 480. tebogoleshaba900atgmaildotcom, CCNA expires on 25 April
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Please send it to {email not allowed}
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Hello friends, would you please send me the latest dumps for SWITCH 300-115 in this email address. I am going to take exam in May-2019.
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Hi Friends,
Would you please send me the latest dumps for SWITCH 300-115
moham.fadl At gmail dot com
IT IS CORRECT TO INSERT THIS COMMAND:
switchport trunk allowed vlan 1.21-23.99 on interface port-channel 1.
Thus the port channel 1 should be configured:
interface Port-channel1
switchport trunk encapsulation dot1q
switchport trunk native vlan 99
switchport trunk allowed vlan 1,21-23
switchport mode trunk
***Please help me.***
@GT, I also added that config in packet tracer on both switches so that i can ping the router.
trunk does not form if you only configure the members of the trunk and not the portchannel itself
Hi Mosh , I did tests:
WITHOUT COMMAND switchport trunk allowed vlan 1,21,22,23 IN PORT-CHANNEL 1:
SWITCH-B#sh interfaces trunk
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 99
Port Vlans allowed on trunk
Po1 1-1005
Port Vlans allowed and active in management domain
Po1 1,21,22,23,99
Port Vlans in spanning tree forwarding state and not pruned
Po1 1,21,22,23,99
SWITCH-B#
++++++++++++++++++++++++++++++++++++++++++++++++++
WITH COMMAND switchport trunk allowed vlan 1,21,22,23 IN PORT-CHANNEL 1:
SWITCH-B#sh inter trun
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 99
Port Vlans allowed on trunk
Po1 1,21-23
Port Vlans allowed and active in management domain
Po1 1,21,22,23
Port Vlans in spanning tree forwarding state and not pruned
Po1 1,21,22,23
SWITCH-B#
——————————————————————————————————–
WITHOUT COMMAND switchport trunk allowed vlan 1,21,22,23 IN PORT-CHANNEL 1:
SWITCH-A#sh interf trunk
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 99
Port Vlans allowed on trunk
Po1 1-1005
Port Vlans allowed and active in management domain
Po1 1,11,12,13,21,22,23,99
Port Vlans in spanning tree forwarding state and not pruned
Po1 1,11,12,13,21,22,23,99
SWITCH-A#
+++++++++++++++++++++++++++++++++++++++++++++++++++
WITH COMMAND switchport trunk allowed vlan 1,21,22,23 IN PORT-CHANNEL 1:
SWITCH-A#sh interf trun
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 99
Port Vlans allowed on trunk
Po1 1,21-23
Port Vlans allowed and active in management domain
Po1 1,21,22,23
Port Vlans in spanning tree forwarding state and not pruned
Po1 21,22,23
Hi Mosh.
in the command switchport trunk allowed vlan 1,21,22,23 IN PORT-CHANNEL 1 the vlan 99 should not be added, because an untagged?
***Please help me.***
HeI would really appreciate that anyone could send me a valid dump for SWITCH 300-115.
My email is david[dot]menendez[at]telecable[dot]es
Hello Friends.
Can anyone please help share dump.
email is {email not allowed}
Writing Exam in May 2019
Passed on April 10th. 934/1000
Labs: VTP3, HSRP sim, AAAdot1x
D&D: same in dump
Multiple choices: many Qs this type (more than 2 choices in one single question)
Thanks 9tut again!
====
E-mail: ballking242(at)gmail(dot)com
Hi Friends,
Would you please send me the latest dumps for SWITCH 300-115
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Hi Friends,
Would you please send me the latest dumps for SWITCH 300-115
mokhtarahmed199(at)gmail(dot)com
can anyone send me dumps for 300-115 on s h a y a n . j @ h o t m a i l
In the packet tracer lab for this sim there is some issue.
When you configure the trunk without the channel-group 1 mode active everything is fine.
But when you include it it automatically created a port channel 1 interface and the switches start to send messages for a native vlan mismatch even when they are configured on the trunk links.
Also there are no trunk links.
In order to enable the trunk links you have to configure the port-channel 1
with switchport mode trunk
switchport trunk native vlan 99- because it constantly blocks the port with messages about vlan mismatch again.
And i am not sure but without this commang switchport trunk allowed vlan 1,21-23 under the port channel the vlans trunked are all from the switch basically.
I am a bit confused here…
Hi everyone,
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If anyone have the latest dump please share with me,
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