Does anybody know what is this? On interface fa0/24 of SW2, the state of
spannnig-tree for Vlan1 was forwarding and for Vlan11 was blocking . All
the values, bridge priority - port priority - port cost, were the default
values. I expected both Vlans as blocking.
The network is:
SW1(fa0/22) -------(fa0/22) SW2(fa0/24)-------(fa0/24)
SW3
(fa0/23)|__________________________________________|(fa0/24)
After almost get crazy, I figured out that maybe the switch was crazy, so I
erased the configuration, reload the switch and typed the configuration
back. And it works fine.
Before that, I just reload the switches, and there was no changes.
SW2#sh spann int fa 0/24
Interface Fa0/24 (port 38) in Spanning tree 1 is FORWARDING
Port path cost 19, Port priority 128
Designated root has priority 32768, address 0002.fd34.9180
Designated bridge has priority 32768, address 0005.326d.65c0
Designated port is 38, path cost 19
Timers: message age 0, forward delay 0, hold 0
BPDU: sent 31481, received 604975
SW3#sh spann int fa 0/24
Interface Fa0/24 (port 38) in Spanning tree 1 is BLOCKING
Port path cost 19, Port priority 128
Designated root has priority 32768, address 0002.fd34.9180
Designated bridge has priority 32768, address 0005.326d.65c0
Designated port is 38, path cost 19
Timers: message age 2, forward delay 0, hold 0
BPDU: sent 605190, received 32565
SW 1
host SW1
!
interface FastEthernet0/1
duplex half
speed 10
switchport access vlan 11
!
interface FastEthernet0/2
duplex half
speed 10
!
interface FastEthernet0/3
duplex half
speed 10
!
interface FastEthernet0/4
duplex half
speed 10
!
interface FastEthernet0/5
duplex half
speed 100
!
interface FastEthernet0/22
description *** connection to SW2 ***
switchport mode trunk
!
interface FastEthernet0/23
description *** connection to SW3 ***
switchport mode trunk
!
Int vlan 1
ip ad 1.1.1.254 255.255.255.0
SW 2
host SW2
!
interface FastEthernet0/22
description *** connection to SW1 ***
switchport mode trunk
!
interface FastEthernet0/24
description *** connection to SW3 ***
switchport mode trunk
!
Int vlan 1
ip ad 2.2.2.254 255.255.255.0
SW 3
host SW3
!
interface FastEthernet0/23
description *** connection to SW1 ***
switchport mode trunk
!
interface FastEthernet0/24
description *** connection to SW2 ***
switchport mode trunk
!
Int vlan 1
ip ad 3.3.3.254 255.255.255.0
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