Wireless Access

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Aruba Employee
Posts: 43
Registered: ‎10-28-2014

why the controller doesn't accumulate the port cost?

[ Edited ]

hi expert,

I configure pvst+ on vlan 125 on 3 devices ,following is diagram:

MAS (root bridge ) ------------------- standy master--------- ------local master
                              connect with trunk               connect with vlan

when I user command to show cost ,in standy master the port cost is 20000 ,but on local master which is two hop to root bridge
port cost is also 20000,why the controller doesn't accumulate the cost value?

 

on standy master:

(Standby-Controller) #show spanning-tree interface gigabitethernet 0/0/0

Spanning Tree port configuration
--------------------------------
Vlan State Cost Prio PortFast P-to-P Role
---- ----- ---- ---- -------- ------ ----
125 Forwarding 20000 128 Disable Enable Root

(Standby-Controller) #show spanning-tree interface gigabitethernet 0/0/1

Spanning Tree port configuration
--------------------------------
Vlan State Cost Prio PortFast P-to-P Role
---- ----- ---- ---- -------- ------ ----
125 Forwarding 20000 128 Disable Enable Designated

on local :


(Standby-Controller) #show spanning-tree interface gigabitethernet 0/0/0

Spanning Tree port configuration
--------------------------------
Vlan State Cost Prio PortFast P-to-P Role
---- ----- ---- ---- -------- ------ ----
125 Forwarding 20000 128 Disable Enable Root

(Standby-Controller) #show spanning-tree interface gigabitethernet 0/0/1

Spanning Tree port configuration
--------------------------------
Vlan State Cost Prio PortFast P-to-P Role
---- ----- ---- ---- -------- ------ ----
125 Forwarding 20000 128 Disable Enable Designated

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