MSTP + HSRP mode
To achieve the alternate routing, redundancy:
VLAN10,20 traffic on CO-SW1 is in the active state, the CO-SW2 is in standby state,
VLAN30,40 traffic on CO-SW1 as standby state, the CO-SW2 is in the active state;
Avoiding loops using MSTP (Multiple Spanning Tree Protocol):
Based on the root flow VLAN10,20 CO-SW1, SW2-on for the second root CO.'S, that is, avoid loops, f0 switch1 the F0 / 2 and switch2 / 2, the block state,
Based on the root flow VLAN30,40 CO-SW2, CO-SW1 is on th root, that is, avoid loops, the Switch1 f0 / 1 and switch2 of f0 / 1, the block state,
Configuration is as follows:
Co-SW1:
Switch>enable
Switch#configure t
Switch(config)#vlan 10
Switch(config-vlan)#vlan 20
Switch(config-vlan)#vlan 30
Switch(config-vlan)#vlan 40
Switch(config-vlan)#exit
Switch(config)#interface range f0/1-2
Switch(config-if-range)# no shutdown
Switch(config-if-range)#switchport trunk encapsulation dot1q
Switch(config-if-range)#switchport mode trunk
Switch(config-if)# exit
# Set the polymerization
Switch(config)#inter range f0/3 -4
Switch(config-if-range)#channel-group 1 mode on
Switch(config-if-range)#exit
Switch(config)#interface port-channel 1
Switch(config-if)#switchport trunk encapsulation dot1q
Switch(config-if)#switchport mode trunk
Switch(config-if)#exit
# MSTP configuration vlan10,20 the main root, vlan30,40 for the second root
switch(config)#spanning-tree mode mstp
switch(config)#spanning-tree mst configuration
switch(config-mst)# name Cisco
switch(config-mst)#revision 1
switch(config-mst)#interface 1 vlan 10,20
switch(config-mst)#interface 2 vlan 30,40
switch(config)#spanning-tree mst 1 root primary
switch(configt)#spanning-tree mst 2 root secondary
# Configure HSRP
switch(config)#interface vlan 10
switch(config)#ip address 192.168.10.2 255.255.255.0
switch(config-if)#standby 1 ip 192.168.20.254
switch(config-if)#standby 1 priority 120
switch(config-if)#standby 1 preempt
switch(config)#interface vlan 20
switch(config)#ip address 192.168.20.2 255.255.255.0
switch(config-if)#standby 2 ip 192.168.20.254
switch(config-if)#standby 2 priority 120
switch(config-if)#standby 2 preempt
switch(config)#interface vlan 30
switch(config)#ip address 192.168.30.1 255.255.255.0
switch(config-if)#standby 3 ip 192.168.30.254
switch(config-if)#standby 3 preempt
switch(config)#interface vlan 40
switch(config)#ip address 192.168.40.1 255.255.255.0
switch(config-if)#standby 4 ip 192.168.40.254
switch(config-if)#standby 4 preempt
Co-SW2:
Switch>enable
Switch#configure t
Switch(config)#vlan 10
Switch(config-vlan)#vlan 20
Switch(config-vlan)#vlan 30
Switch(config-vlan)#vlan 40
Switch(config-vlan)#exit
Switch(config)#interface range f0/1-2
Switch(config-if-range)# no shutdown
Switch(config-if-range)#switchport trunk encapsulation dot1q
Switch(config-if-range)#switchport mode trunk
Switch(config-if)# exit
# Set the polymerization
Switch(config)#inter range f0/3 -4
Switch(config-if-range)#channel-group 1 mode on
Switch(config-if-range)#exit
Switch(config)#interface port-channel 1
Switch(config-if)#switchport trunk encapsulation dot1q
Switch(config-if)#switchport mode trunk
Switch(config-if)#exit
#MSTP configured vlan10,20 as a secondary root, vlan30,40 main root
switch(config)#spanning-tree mode mstp
switch(config)#spanning-tree mst configuration
switch(config-mst)# name Cisco
switch(config-mst)#revision 1
switch(config-mst)#interface 1 vlan 10,20
switch(config-mst)#interface 2 vlan 30,40
switch(config)#spanning-tree mst 1 root secondary
switch(configt)#spanning-tree mst 2 root primary
# Configure HSRP
switch(config)#interface vlan 10
switch(config)#ip address 192.168.10.1 255.255.255.0
switch(config-if)#standby 1 ip 192.168.20.254
switch(config-if)#standby 1 preempt
switch(config)#interface vlan 20
switch(config)#ip address 192.168.20.1 255.255.255.0
switch(config-if)#standby 2 ip 192.168.20.254
switch(config-if)#standby 2 preempt
switch(config)#interface vlan 30
switch(config)#ip address 192.168.30.2 255.255.255.0
switch(config-if)#standby 3 ip 192.168.30.254
switch(config-if)#standby 3 priority 120
switch(config-if)#standby 3 preempt
switch(config)#interface vlan 40
switch(config)#ip address 192.168.40.2 255.255.255.0
switch(config-if)#standby 4 ip 192.168.40.254
switch(config-if)#standby 4 priority 120
switch(config-if)#standby 4 preempt
Switch1:
Switch#configure t
Switch(config)#vlan 10
Switch(config-vlan)#vlan 20
Switch(config-vlan)#vlan 30
Switch(config-vlan)#vlan 40
Switch(config-vlan)#exit
Switch(config)#interface range f0/1-2
Switch(config-if-range)# no shutdown
Switch(config-if-range)#switchport trunk encapsulation dot1q
Switch(config-if-range)#switchport mode trunk
Switch(config-if)# exit
#MSTP configuration vlan10,20, vlan30,40 default
switch(config)#spanning-tree mode mstp
switch(config)#spanning-tree mst configuration
switch(config-mst)# name Cisco
switch(config-mst)#revision 1
switch(config-mst)#interface 1 vlan 10,20
switch(config-mst)#interface 2 vlan 30,40
switch(config-mst)#exit
Switch2:
Switch#configure t
Switch(config)#vlan 10
Switch(config-vlan)#vlan 20
Switch(config-vlan)#vlan 30
Switch(config-vlan)#vlan 40
Switch(config-vlan)#exit
Switch(config)#interface range f0/1-2
Switch(config-if-range)# no shutdown
Switch(config-if-range)#switchport trunk encapsulation dot1q
Switch(config-if-range)#switchport mode trunk
Switch(config-if)# exit
#MSTP configuration vlan10,20, vlan30,40 default
switch(config)#spanning-tree mode mstp
switch(config)#spanning-tree mst configuration
switch(config-mst)# name Cisco
switch(config-mst)#revision 1
switch(config-mst)#interface 1 vlan 10,20
switch(config-mst)#interface 2 vlan 30,40
switch(config-mst)#exit
Reference Address: http://www.ccietea.com/