Cisco Spanning Tree Protocol

Anzeigen des Spanning Tree zustandes

• switch-gelb#show spanning-tree

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    32768
             Address     0015.177b.84f0
             Cost        20019
             Port        3 (FastEthernet1/0/1)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay  2 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0011.bb0e.fb00
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time 2  

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa1/0/1             Root FWD 19        128.3    P2p 
Fa1/0/2             Desg FWD 19        128.4    P2p 
Fa1/0/48            Desg FWD 19        128.52   P2p 

Port 2 wurde auf beiden Swichtes zum Trunking konfiguriert

Untersuchung von Vlan 10

• switch-rot#show spanning-tree vlan 10

VLAN0010

 Spanning tree enabled protocol ieee
 Root ID    Priority    32778
            Address     0011.bb0e.fb00
            Cost        19
            Port        2 (GigabitEthernet1/0/2)
            Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

 Bridge ID  Priority    32778  (priority 32768 sys-id-ext 10)
            Address     0012.d9a3.4400
            Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
            Aging Time  300 sec

Interface Role Sts Cost Prio.Nbr Type

---

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

Gi1/0/2 Root FWD 19 128.2 P2p Gi1/0/24 Altn BLK 19 128.24 P2p

Port Gi1/0/24 blockt

Ziehen von Port Gi1/0/2

• show spanning-tree vlan 10

...
Gi1/0/24            Root LRN 19        128.24   P2
...

Nach einer gewissen Zeit.

...
Gi1/0/24            Root FWD 19        128.24   P2p
...

Links

• http://www.cisco.com/image/gif/paws/5234/5.pdf