LACP with STP Sim | Switch practice Lab

Link Aggregation Control Protocol Configuration:

Suppose you have just added a new switch (SwitchB) to the existing network as shown in the topology.

RouterA is currently configured correctly for providing the routing function for devices on SwitchA and SwitchB. You need to be modified SwitchA to support the addition of SwitchB. 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 is correct and should not be modified. 
• You need to configure SwitchA as 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

You need to configure the VLANs according to following information:

VLAN#	VLAN NAME	VLAN Ports
21	HR	Fa1/9 and fa1/10
22	Finance	Fa1/5 and fa1/6
23	Marketing	Fa1/15 and fa1/14

– Access ports that assigned to VLANs 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. And no routing is required on this Switch
–SVI vlan 1 is to be configured with IP 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.

Answer and Explanation:

Some useful commands that may help you to find out the necessary information on SwitchA are as following: (Cisco basic router Commands)

show vtp status (you can get the information about VTP status on SwitchA i.e. SwitchA is in transparent mode)

show spanning-tree (rapid-pvst mode on SwitchA)

show vlan (check the native vlan and the existence of vlan100)

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 (for complete configuration of Switch)

Configure the SwitchA as root switch for vlans 11, 12, 13, 21, 22 and 23 and need to have the same configuration as the SwitchB for successful configuration.

SwitchA>enable

SwitchA #configure terminal

SwitchA (config)#spanning-tree vlan 11,12,13,21,22,23 root primary

SwitchA (config)#vlan 21
SwitchA (config-vlan)#name HR
SwitchA (config-vlan)#exit

SwitchA (config)#vlan 22
SwitchA (config-vlan)#name Finance
SwitchA (config-vlan)#exit

SwitchA (config)#vlan 23
SwitchA (config-vlan)#name Marketing
SwitchA (config-vlan)#exit
SwitchA (config)#interface range Fa1/3 – 4
SwitchA (config-if-range)#switchport mode trunk
SwitchA (config-if-range)#switchport trunk native vlan 100
SwitchA (config-if-range)#switchport trunk allowed vlan 1,21,23
SwitchA (config-if-range)#channel-group 1 mode active
SwitchA (config-if-range)#channel-protocol lacp
SwitchA (config-if-range)#no shutdown
SwitchA (config-if-range)#end

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Configuration VLANs according to given table:
SWITCHB#configure terminal

SWITCHB(config)#vlan 21
SWITCHB(config-vlan)#name HR
SWITCHB(config-vlan)#exit

SWITCHB(config)#vlan 22
SWITCHB(config-vlan)#name Finance
SWITCHB(config-vlan)#exit

SWITCHB(config)#vlan 23
SWITCHB(config-vlan)#name Marketing
SWITCHB(config-vlan)#exit
SWITCHB(config)#vlan 100
SWITCHB(config-vlan)#name TrunkNativeVlan

SWITCHB(config-vlan)#exit
SWITCHB(config)#interface range Fa1/9 – 10
SWITCHB(config-if-range)#switchport mode access
SWITCHB(config-if-range)#switchport access vlan 21
SWITCHB(config-if-range)#spanning-tree portfast (Access ports that assigned to VLANs should transition immediately to forwarding state upon detecting the connection of a device.)
SWITCHB(config-if-range)#no shutdown
SWITCHB(config-if-range)#exit

SWITCHB(config)#interface range Fa1/5 – 6
SWITCHB(config-if-range)#switchport mode access
SWITCHB(config-if-range)#switchport access vlan 22
SWITCHB(config-if-range)#spanning-tree portfast
SWITCHB(config-if-range)#no shutdown
SWITCHB(config-if-range)#exit

SWITCHB(config)#interface range Fa1/14 – 15
SWITCHB(config-if-range)#switchport mode access
SWITCHB(config-if-range)#switchport access vlan 23
SWITCHB(config-if-range)#spanning-tree portfast
SWITCHB(config-if-range)#no shutdown
SWITCHB(config-if-range)#exit

SwitchB VTP mode needs to be the same as SwitchA:

SWITCHB(config)#vtp mode transparent

SWITCHB(config)#spanning-tree mode rapid-pvst

Configure VLAN-1 with IP address 192.168.1.1:

SWITCHB(config)#interface vlan 1
SWITCHB(config-if)#ip address 192.168.1.11 255.255.255.0
SWITCHB(config-if)#no shutdown
SWITCHB(config-if)#exit

Vlans 1, 21, 22 and 23 should tagged when traversing the trunk link:

SWITCHB(config)#interface range Fa1/3 – 4
SWITCHB(config-if-range)#switchport trunk encapsulation dot1q

SWITCHB(config-if-range)#switchport mode trunk
SWITCHB(config-if-range)#switchport trunk native vlan 100
SWITCHB(config-if-range)#switchport trunk allowed vlan 1,21-23

Maximum use of bandwidth for all vlans with SwitchA controlling activation:
SWITCHB(config-if-range)#channel-group 1 mode passive //mode passive because “SwitchA controlling activation”
SWITCHB(config-if-range)#channel-protocol lacp
SWITCHB(config-if-range)#no shutdown
SWITCHB(config-if-range)#end