I'm very new to all of this but I am trying to create a network topology as practice that uses three etherchannels across three switches and then rely on STP to block one. So far it was working well. However, when I look at the spanning tree, I see that whilst the ether channel says it is blocking, the ports I am using (which as far as I am aware shouldn't be showing in the spanning tree) are showing up and saying they are forwarding. What is the issue here as I have spent hours googling this and can't find a solution.
Also I don't understand why I have VLAN 0020 showing as well as VLAN 0001 I do have a plan 20 setup if that is the case but could you also explain this as well. Any help will be a life saver.
P01 should contain G0/1 & G0/2
p02 should contain Fa0/23 & fa0/24
Switch#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0000.0C7D.2383
Cost 3
Port 27(Port-channel1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0001.C7A9.D229
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/2 Desg FWD 19 128.2 P2p
Po2 Altn BLK 9 128.28 Shr
Po1 Root FWD 3 128.27 Shr
Fa0/1 Desg FWD 19 128.1 P2p
VLAN0020
Spanning tree enabled protocol ieee
Root ID Priority 32788
Address 0000.0C7D.2383
Cost 3
Port 27(Port-channel1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)
Address 0001.C7A9.D229
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/3 Desg FWD 19 128.3 P2p
Po2 Altn BLK 9 128.28 Shr
Po1 Root FWD 3 128.27 Shr
Switch#
Switch#
Switch#show eth
Switch#show etherchannel su
Switch#show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 2
Number of aggregators: 2
Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------
1 Po1(SU) LACP Gig0/1(P) Gig0/2(P)
2 Po2(SU) LACP Fa0/23(P) Fa0/24(P)
Switch#
My switch configurations are as follows
Switch 0:
Switch#show running-config
Building configuration...
Current configuration : 1413 bytes
!
version 15.0
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
!
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
interface Port-channel1
switchport mode trunk
!
interface Port-channel2
switchport mode trunk
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
switchport access vlan 20
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
switchport mode trunk
channel-group 2 mode active
!
interface FastEthernet0/24
switchport mode trunk
channel-group 2 mode active
!
interface GigabitEthernet0/1
switchport mode trunk
channel-group 1 mode active
!
interface GigabitEthernet0/2
switchport mode trunk
channel-group 1 mode active
!
interface Vlan1
no ip address
shutdown
!
!
!
!
line con 0
!
line vty 0 4
login
line vty 5 15
login
!
!
!
!
end
Switch 1:
Switch#show running-config
Building configuration...
Current configuration : 1413 bytes
!
version 15.0
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
!
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
interface Port-channel2
switchport mode trunk
!
interface Port-channel3
switchport mode trunk
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
switchport access vlan 20
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
switchport mode trunk
channel-group 2 mode active
!
interface FastEthernet0/24
switchport mode trunk
channel-group 2 mode active
!
interface GigabitEthernet0/1
switchport mode trunk
channel-group 3 mode active
!
interface GigabitEthernet0/2
switchport mode trunk
channel-group 3 mode active
!
interface Vlan1
no ip address
shutdown
!
!
!
!
line con 0
!
line vty 0 4
login
line vty 5 15
login
!
!
!
!
end
Switch 2:
Switch#show running-config
Building configuration...
Current configuration : 929 bytes
!
version 12.1
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
!
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
interface Port-channel1
switchport mode trunk
!
interface Port-channel3
switchport mode trunk
!
interface FastEthernet0/1
!
interface FastEthernet1/1
!
interface FastEthernet2/1
!
interface FastEthernet3/1
!
interface FastEthernet4/1
!
interface FastEthernet5/1
!
interface GigabitEthernet6/1
switchport mode trunk
channel-group 1 mode active
!
interface GigabitEthernet7/1
switchport mode trunk
channel-group 1 mode active
!
interface GigabitEthernet8/1
switchport mode trunk
channel-group 3 mode active
!
interface GigabitEthernet9/1
switchport mode trunk
channel-group 3 mode active
!
interface Vlan1
no ip address
shutdown
!
!
!
!
line con 0
!
line vty 0 4
login
line vty 5 15
login
!
!
!
!
end
Switch#
Switch#
My network topology looks as the following
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