Exam 300-115 topic 1 question 99 discussion

SIMULATION -
Scenario:
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.
All commands must be entered at the physical interface level.
Configuration Requirements for SwitchA
The VTP and STP configuration models on Switch A 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 at their default values.
Configuration Requirements for SwitchB
✑ Vlan21
- Name: Marketing
- will support two servers attached to fa0/9 and fa0/10
✑ Vlan22
- Name: Sales
- will support two servers attached to fa0/13 and fa0/14
✑ Vlan23
- 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 and23 should be 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.

Suggested Answer: Here are steps
(some lines have been removed)

Initial Configuration -


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)#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
SW-A(config-if-range)#no switchport access vlan 98 (These two commands must be deleted to form a trunking link)
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)#interface port-channel 1
SW-A(config-if)#switchport mode trunk
SW-A(config-if)#switchport trunk native vlan 99 //this command will prevent the "Native VLAN mismatched" error on both switches
SW-A(config-if)#switchport trunk allowed vlan 1,21-23

SW-A(config-if)#no shut -
When you apply commands under "interface port-channel 1", the same commands will be automatically applied to the physical member interfaces (of port-
Note:
channel 1) so you dont need to type them under physical member interfaces again.

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)

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-range)#channel-group 1 mode passive //mode passive because "SwitchA controlling activation"
SW-B(config-if-range)#channel-protocol lacp
SW-B(config-if-range)#no shutdown
SW-B(config-if)#interface port-channel 1
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)#no shut -
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

Configuration Requirements for SwitchB

Inter-switch Connectivity Configuration Requirements:

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
(to check everything again).
run
+ 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.