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LAB 5
Masih menggunakan topology yang sama dengan LAB 4. Portfast ini berfungsi ketika pc/router dicolok ke port switch langsung aktif/hijau portnya tanpa menunggu waktu 50 detik (blocking-listening-learning-forwarding).
Untuk pengetesannya yaitu sederhana adalah colokkan PC ke switch yang belum diset portfast dan yang sudah diset portfast. By default switch akan melalui prosses listening -> learning seperti berikut ini.
SW1
SW-1#debug spanning-tree eventsSW-1(config)#int e0/0
SW-1(config-if)#shutdown
*Des 9 12:05:41.821: %LINK-5-CHANGED: Interface Ethernet0/0, changed
state to administratively down
SW-1(config-if)#no shutdown
*Des 9 12:05:48.316: STP: VLAN0010 Et0/0 -> listening
*Des 9 12:06:03.317: STP: VLAN0010 Et0/0 -> learning
*Des 9 12:06:26.431: STP: VLAN0010 Et0/0 -> forwarding
SW-1(config)#int e0/0 Konfigurasikan portfast pada SW-1
SW1
SW-1(config-if)#spanning-tree portfast
SW-1#show spanning-tree int e0/0 detail Verifikasi
SW1
Port 1 (Ethernet0/0) of VLAN0010 is designated forwarding
Port path cost 100, Port priority 128, Port Identifier 128.1.
Designated root has priority 32778, address aabb.cc00.0200
Designated bridge has priority 32778, address aabb.cc00.0200
Designated port id is 128.1, designated path cost 0
Timers: message age 0, forward delay 0, hold 2
Number of transitions to forwarding state: 1
The port is in the portfast edge mode
Link type is point-to-point by default
BPDU: sent 1065, received 0
SW-1#debug spanning-tree events Spanning Tree BPDU masih tetap dikirimkan pada link Portfast. Pengetesannya, jalankan debug kemudian lepas kabel atau shut, no shut.
SW1
event debugging is on
SW-1(config-if)#shutdown
SW-1(config-if)#
*Des 9 12:00:42.509: STP: VLAN0010 we are the spanning tree
root SW-1(config-if)#
*Des 9 12:00:44.514: %LINK-5-CHANGED: Interface Ethernet0/0, changed state
to administratively down
*Des 9 12:00:45.520: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Ethernet0/0, changed state to down
SW-1(config-if)#no shutdown
SW-1(config-if)#exit
*Des 9 12:00:51.687: STP: VLAN0010 Et0/0 ->jump to forwarding fromblocking