Lab 6. STP Features : UplinkFast

SW 1

IOU1(config)#vlan 12

IOU1(config-vlan)#name Bebas

IOU1(config-vlan)#interface vlan 12

IOU1(config-if)#ip address 12.12.12.1 255.255.255.0

IOU1(config-if)#no shutdown

IOU1(config)#int e0/0

IOU1(config-if)#switchport trunk encapsulation dot1

IOU1(config-if)#switchport trunk encapsulation dot1q

IOU1(config-if)#switchport mode trunk

IOU1(config)#int e0/1

IOU1(config-if)#switchport trunk encapsulation dot1q

IOU1(config-if)#switchport mode trunk 

SW 2

IOU2#conf t

IOU2(config)#vlan 12

IOU2(config-vlan)#name Bebas

IOU2(config-vlan)#interface vlan 12

IOU2(config-if)#ip address 12.12.12.2 255.255.255.0

IOU2(config-if)#no shutdown

IOU2(config-if)#int e0/0

IOU2(config-if)#switchport trunk encapsulation dot1q

IOU2(config-if)#switchport mode trunk

IOU2(config-if)#int e0/1

IOU2(config-if)#switchport trunk encapsulation dot1q

IOU2(config-if)#switchport mode trunk

IOU2(config-if)#end 

SW 2

IOU2#sh spanning-tree vlan 12

VLAN0012

Spanning tree enabled protocol ieee

Root ID Priority 32780

Address aabb.cc00.0100

Cost 100

Port 1 (Ethernet0/0)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32780 (priority 32768 sys-id-ext 12)

Address aabb.cc00.0200

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Et0/0 Root FWD 100 128.1 Shr

Et0/1 Altn BLK 100 128.2 Shr

SW 2

SW2(config)#do ping 12.12.12.1 re 10000

Type escape sequence to abort.

Sending 10000, 100-byte ICMP Echos to 12.12.12.1, timeout is 2 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 99 percent (9976/10000), round-trip min/avg/max =

1/4/4294967295 ms

SW 1

SW1(config)#int e0/0

SW1(config-if)#shutdown

SW1(config-if)#exit

SW 2

SW2#ping 12.12.12.1 re 10000 Type escape sequence to abort.

Sending 10000, 100-byte ICMP Echos to 12.12.12.1, timeout is 2 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 99 percent (9992/10000), round-trip min/avg/max = 1/4/92

ms

SW 1

SW1#debug spanning-tree uplinkfast

Spanning Tree uplinkfast debugging is on |

SW1#conf t

SW1(config)#interface e0/0

SW1(config-if)#shutdown

*Feb 1 15:44:52.837: STP FAST: UPLINKFAST: make_forwarding on

VLAN0001 Ethernet0/1 root port id new: 128.2 prev: 128.1

*Feb 1 15:44:52.837: %SPANTREE_FAST-7-PORT_FWD_UPLINK: VLAN0001

Ethernet0/1 moved to Forwarding (UplinkFast).