S1:
v konfiguračním módu:

vlan 10
name zamestnanci
vlan 20
name hoste

int f0/1
switchport mode trunk
int f0/2
switchport mode trunk
int f0/24
switchport mode access
switchport access vlan 10

S2: 
v konfiguračním módu:

vlan 10
name zamestnanci
vlan 20
name hoste
int f0/1
switchport mode trunk
int f0/2
switchport mode trunk
int g0/1
switchport mode trunk

S3:
v konfiguračním módu:

vlan 10
name zamestnanci
vlan 20
name hoste

int f0/1
switchport mode trunk
int f0/2
switchport mode trunk
int f0/24
switchport mode access
switchport access vlan 20

R1:
v konfiguračním módu:

int g0/0.10
encapsulation dot1q 10
ip addr 10.10.0.1 255.255.0.0
ipv6 addr 2001:a:a:10::1/64
ipv6 addr fe80::1 link-local
int g0/0.20
encapsulation dot1q 20
ip addr 10.20.0.1 255.255.0.0
ipv6 addr 2001:a:a:20::1/64
ipv6 addr fe80::1 link-local
int g0/0
no shut
exit
ipv6 unicast-routing