10-19-2021 10:34 AM
I am getting a vlan mismatch all though I have configured the native vlan on both interfaces as vlan 30
interface FastEthernet0/22
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport mode trunk
This is the configuration on one of the two interfaces on the layer 2 switch the below is one of four interface configurations on the layer 3 switch.
interface FastEthernet0/21
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport trunk encapsulation dot1q
spanning-tree guard root
I don't see why this is not work I am obviously missing something here?
I will add the PKT. file below as well.
Solved! Go to Solution.
10-21-2021 03:41 AM
The reason for the issue was that I assigned the vlans to the physical interfaces and not the inter port-channel 1 you need to remove switchport trunk allowed vlan 10,20,30 from the physical interfaces and then use the below configuration
conf t
int port-channel 1
switchport trunk allowed vlan 10,20,30
10-19-2021 10:55 AM
not seen the attachements, is this PT file ? i am not a PT user.
Make sure you created the all the VLAN both sides, and shut and no shut both the side and check.
10-19-2021 11:36 AM
I am fairly sure I have already done so but I will add the three configurations and you can see if I have missed anything?
hostname CoreSW_1
!
!
enable secret 5 $1$mERr$KTYfdhYGp9j1mTr7d5BYo0
!
!
ip dhcp excluded-address 192.168.1.1 192.168.1.10
ip dhcp excluded-address 192.168.2.1 192.168.2.20
ip dhcp excluded-address 192.168.3.1 192.168.3.30
!
ip dhcp pool vlan10
network 192.168.1.0 255.255.255.0
default-router 192.168.1.10
dns-server 8.8.8.8
ip dhcp pool vlan20
network 192.168.2.0 255.255.255.0
default-router 192.168.2.20
dns-server 8.8.8.8
ip dhcp pool vlan30
network 192.168.3.0 255.255.255.0
default-router 192.168.3.30
dns-server 8.8.8.8
!
!
ip routing
!
!
!
!
username Admin secret 5 $1$mERr$KTYfdhYGp9j1mTr7d5BYo0
!
!
!
!
!
!
!
!
!
!
no ip domain-lookup
!
!
spanning-tree mode pvst
spanning-tree vlan 10,20,30 priority 24576
!
!
!
!
!
!
interface FastEthernet0/1
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/2
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/3
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/4
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/5
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/6
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/7
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/8
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/9
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/10
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/11
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/12
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/13
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/14
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/15
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/16
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/17
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/18
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/19
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/20
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet0/21
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport trunk encapsulation dot1q
spanning-tree guard root
!
interface FastEthernet0/22
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport trunk encapsulation dot1q
spanning-tree guard root
!
interface FastEthernet0/23
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport trunk encapsulation dot1q
spanning-tree guard root
!
interface FastEthernet0/24
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport trunk encapsulation dot1q
spanning-tree guard root
!
!
interface GigabitEthernet0/1
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface GigabitEthernet0/2
no switchport
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
mac-address 00e0.f920.2601
ip address 192.168.1.10 255.255.255.0
!
interface Vlan20
mac-address 00e0.f920.2602
ip address 192.168.2.20 255.255.255.0
!
interface Vlan30
mac-address 00e0.f920.2603
ip address 192.168.3.30 255.255.255.0
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
login local
!
line aux 0
!
line vty 0 4
login
!
!
!
!
end
This is the Layer 3 core switch on the configuration I am currently working on I will add Layer 2 switch configuration in my next reply
10-19-2021 11:41 AM
Here is the layers 2 switches configurations
hostname SW_1
!
enable secret 5 $1$mERr$KTYfdhYGp9j1mTr7d5BYo0
!
!
!
no ip domain-lookup
!
username Admin secret 5 $1$mERr$KTYfdhYGp9j1mTr7d5BYo0
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
interface FastEthernet0/1
switchport access vlan 10
switchport mode access
switchport port-security
switchport port-security mac-address sticky
switchport port-security violation restrict
switchport port-security mac-address sticky 0002.4A14.8DA8
spanning-tree portfast
spanning-tree bpduguard enable
!
interface FastEthernet0/2
switchport access vlan 10
switchport mode access
switchport port-security
switchport port-security mac-address sticky
switchport port-security violation restrict
switchport port-security mac-address sticky 00E0.B0DE.EBB6
spanning-tree portfast
spanning-tree bpduguard enable
!
interface FastEthernet0/3
switchport access vlan 20
switchport mode access
switchport port-security
switchport port-security mac-address sticky
switchport port-security violation restrict
switchport port-security mac-address sticky 00D0.BC7C.0C85
spanning-tree portfast
spanning-tree bpduguard enable
!
interface FastEthernet0/4
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/5
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/6
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/7
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/8
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/9
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/10
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/11
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/12
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/13
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/14
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/15
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/16
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/17
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/18
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/19
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport mode trunk
!
interface FastEthernet0/20
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport mode trunk
!
interface FastEthernet0/21
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/22
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport mode trunk
!
interface FastEthernet0/23
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/24
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport mode trunk
!
interface GigabitEthernet0/1
switchport access vlan 99
switchport mode access
shutdown
!
interface GigabitEthernet0/2
switchport access vlan 99
switchport mode access
shutdown
!
interface Vlan1
no ip address
shutdown
!
!
!
!
line con 0
logging synchronous
login local
exec-timeout 0 0
!
line vty 0 4
login
line vty 5 15
login
!
!
!
!
end
and the second layer 2 switch is as follows
hostname SW_2#
!
enable secret 5 $1$mERr$KTYfdhYGp9j1mTr7d5BYo0
!
!
!
no ip domain-lookup
!
username Admin secret 5 $1$mERr$KTYfdhYGp9j1mTr7d5BYo0
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
interface FastEthernet0/1
switchport access vlan 20
switchport mode access
switchport port-security
switchport port-security mac-address sticky
switchport port-security violation restrict
switchport port-security mac-address sticky 0050.0F86.9950
spanning-tree portfast
spanning-tree bpduguard enable
!
interface FastEthernet0/2
switchport access vlan 30
switchport mode access
switchport port-security
switchport port-security mac-address sticky
switchport port-security violation restrict
switchport port-security mac-address sticky 0050.0F5A.8D60
spanning-tree portfast
spanning-tree bpduguard enable
!
interface FastEthernet0/3
switchport access vlan 30
switchport mode access
switchport port-security
switchport port-security mac-address sticky
switchport port-security violation restrict
switchport port-security mac-address sticky 000D.BD75.913C
spanning-tree portfast
spanning-tree bpduguard enable
!
interface FastEthernet0/4
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/5
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/6
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/7
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/8
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/9
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/10
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/11
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/12
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/13
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/14
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/15
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/16
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/17
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/18
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/19
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport mode trunk
!
interface FastEthernet0/20
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport mode trunk
!
interface FastEthernet0/21
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport mode trunk
!
interface FastEthernet0/22
switchport access vlan 99
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
shutdown
!
interface FastEthernet0/23
switchport trunk native vlan 30
switchport trunk allowed vlan 10,20,30
switchport mode trunk
!
interface FastEthernet0/24
switchport access vlan 99
switchport mode access
spanning-tree bpduguard enable
!
interface GigabitEthernet0/1
switchport access vlan 99
switchport mode access
shutdown
!
interface GigabitEthernet0/2
switchport access vlan 99
switchport mode access
shutdown
!
interface Vlan1
no ip address
shutdown
!
!
!
!
line con 0
logging synchronous
login local
exec-timeout 0 0
!
line vty 0 4
login
line vty 5 15
login
!
!
!
!
end
10-19-2021 02:31 PM
Could you provide the native vlan mismatch log you are seeing as well as the following:
show cdp neighbor
show int status
10-19-2021 02:13 PM
Can anybody see anything on the three switch configurations. I am missing on the trunk interfaces that is giving me a VLAN mismatch on my devices?
10-19-2021 02:41 PM
Can you post the below output from both the switches?
show vlan
show cdp neigh
show spann brief
10-19-2021 02:57 PM
CoreSW_1#show vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
10 VLAN0010 active
20 VLAN0020 active
30 VLAN0030 active
99 VLAN0099 active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
10 enet 100010 1500 - - - - - 0 0
20 enet 100020 1500 - - - - - 0 0
30 enet 100030 1500 - - - - - 0 0
99 enet 100099 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
Remote SPAN VLANs
------------------------------------------------------------------------------
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
CoreSW_1#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
SW_1 Fas 0/24 155 S 2960 Fas 0/24
SW_2# Fas 0/21 150 S 2960 Fas 0/21
SW_2# Fas 0/23 150 S 2960 Fas 0/23
SW_1 Fas 0/22 155 S 2960 Fas 0/22
CoreSW_1#show vlan brief
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
10 VLAN0010 active
20 VLAN0020 active
30 VLAN0030 active
99 VLAN0099 active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
10-19-2021 03:04 PM
SW_1#show vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
10 VLAN0010 active Fa0/1, Fa0/2
20 VLAN0020 active Fa0/3
30 VLAN0030 active
99 VLAN0099 active Fa0/4, Fa0/5, Fa0/6, Fa0/7
Fa0/8, Fa0/9, Fa0/10, Fa0/11
Fa0/12, Fa0/13, Fa0/14, Fa0/15
Fa0/16, Fa0/17, Fa0/18, Fa0/21
Fa0/23, Gig0/1, Gig0/2
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
10 enet 100010 1500 - - - - - 0 0
20 enet 100020 1500 - - - - - 0 0
30 enet 100030 1500 - - - - - 0 0
99 enet 100099 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
SW_1#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
SW_2# Fas 0/20 6 S 2960 Fas 0/20
CoreSW_1 Fas 0/22 108 3560 Fas 0/22
SW_2# Fas 0/19 66 S 2960 Fas 0/19
CoreSW_1 Fas 0/24 168 3560 Fas 0/24
SW_1#show vlan brief
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
10 VLAN0010 active Fa0/1, Fa0/2
20 VLAN0020 active Fa0/3
30 VLAN0030 active
99 VLAN0099 active Fa0/4, Fa0/5, Fa0/6, Fa0/7
Fa0/8, Fa0/9, Fa0/10, Fa0/11
Fa0/12, Fa0/13, Fa0/14, Fa0/15
Fa0/16, Fa0/17, Fa0/18, Fa0/21
Fa0/23, Gig0/1, Gig0/2
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
SW_1#
SW_2##show vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
10 VLAN0010 active
20 VLAN0020 active Fa0/1
30 VLAN0030 active Fa0/2, Fa0/3
99 VLAN0099 active Fa0/4, Fa0/5, Fa0/6, Fa0/7
Fa0/8, Fa0/9, Fa0/10, Fa0/11
Fa0/12, Fa0/13, Fa0/14, Fa0/15
Fa0/16, Fa0/17, Fa0/18, Fa0/22
Fa0/24, Gig0/1, Gig0/2
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
10 enet 100010 1500 - - - - - 0 0
20 enet 100020 1500 - - - - - 0 0
30 enet 100030 1500 - - - - - 0 0
99 enet 100099 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
Remote SPAN VLANs
------------------------------------------------------------------------------
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
SW_2##
SW_2##show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
SW_1 Fas 0/20 121 S 2960 Fas 0/20
CoreSW_1 Fas 0/21 38 3560 Fas 0/21
CoreSW_1 Fas 0/23 158 3560 Fas 0/23
SW_2##
SW_1#show vlan brief
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
10 VLAN0010 active Fa0/1, Fa0/2
20 VLAN0020 active Fa0/3
30 VLAN0030 active
99 VLAN0099 active Fa0/4, Fa0/5, Fa0/6, Fa0/7
Fa0/8, Fa0/9, Fa0/10, Fa0/11
Fa0/12, Fa0/13, Fa0/14, Fa0/15
Fa0/16, Fa0/17, Fa0/18, Fa0/21
Fa0/23, Gig0/1, Gig0/2
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
That's all the information from the three switches I hope that helps?
Remote SPAN VLANs
------------------------------------------------------------------------------
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
10-20-2021 02:34 AM
CoreSW_1(config)#int fa0/23
CoreSW_1(config-if)#channel-
CoreSW_1(config-if)#channel-
CoreSW_1(config-if)#channel-group 1 mode des
CoreSW_1(config-if)#channel-group 1 mode desirable
CoreSW_1(config-if)#
Creating a port-channel interface Port-channel 1
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to down
%EC-5-CANNOT_BUNDLE2: Fa0/23 is not compatible with Po1 and will be suspended (vlan mask is different)
This is a new error I have here
10-21-2021 03:41 AM
The reason for the issue was that I assigned the vlans to the physical interfaces and not the inter port-channel 1 you need to remove switchport trunk allowed vlan 10,20,30 from the physical interfaces and then use the below configuration
conf t
int port-channel 1
switchport trunk allowed vlan 10,20,30
10-21-2021 03:45 AM
That is correct, once the member in port-channel always change the settings on port-channel, not to individual interface, that create in consistance.
hope that resolves the issue.
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