05-15-2006 09:36 PM - edited 03-03-2019 03:13 AM
hi guyz, i got connected 2 switch both trunk is using 802.1q and STP on. but 1 of my switch is keep blocking the trunk port and i have only 1 physical connection btw this 2 device... below is the debug msg and sh runn
BTN_CORE_1#sh spanning-tree interface gigabitEthernet 4/1 detail
Port 193 (GigabitEthernet4/1) of VLAN0100 is broken (Port VLAN ID Mismatch)
Port path cost 4, Port priority 128, Port Identifier 128.193.
Designated root has priority 32868, address 0016.466c.ccc0
Designated bridge has priority 32868, address 0016.466c.ccc0
Designated port id is 128.193, designated path cost 0
Timers: message age 0, forward delay 14, hold 0
Number of transitions to forwarding state: 0
Link type is point-to-point by default
BPDU: sent 291, received 0
05-15-2006 09:37 PM
BTN_CORE_1#sh run
Building configuration...
Current configuration : 5544 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service compress-config
!
hostname BTN_CORE_1
!
boot-start-marker
boot-end-marker
!
!
redundancy
mode sso
enable password btn
!
no aaa new-model
hw-module uplink select tengigabitethernet
vtp domain ''
vtp mode transparent
ip subnet-zero
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
power redundancy-mode redundant
!
!
!
vlan internal allocation policy ascending
!
vlan 2
name NATIVE_VLAN
!
vlan 100,200,300,400,500
!
!
interface GigabitEthernet3/1
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/2
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/3
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/4
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/5
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/6
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/7
switchport access vlan 500
switchport mode access
!
interface GigabitEthernet3/8
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/9
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/10
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/11
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/12
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/13
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/14
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/15
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/16
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/17
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/18
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/19
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/20
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/21
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/22
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/23
switchport access vlan 100
switchport mode access
!
interface GigabitEthernet3/24
!
interface GigabitEthernet4/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100-500
switchport mode trunk
!
interface GigabitEthernet4/23
switchport access vlan 100
switchport mode access
!
interface Vlan1
no ip address
shutdown
!
interface Vlan100
ip address 10.20.152.3 255.255.255.128
standby ip 10.20.152.2
!
interface Vlan200
ip address 10.20.153.2 255.255.255.128
standby ip 10.20.153.1
!
interface Vlan300
ip address 10.20.153.130 255.255.255.128
standby ip 10.20.153.129
!
interface Vlan400
ip address 10.20.154.2 255.255.255.128
standby ip 10.20.154.1
!
interface Vlan500
ip address 10.20.155.2 255.255.255.128
standby ip 10.20.155.1
!
ip route 0.0.0.0 0.0.0.0 10.20.152.1
05-15-2006 09:58 PM
HI
This is the normal behaviour for STP to block one link if u r having redundant links in order to prevent loops in u r netwotk.
As far as VLANID mismatch is concerned i think u r having different native vlans on u r trunk ports.
Ensure that u have same native vlan on the ends of the switches.
Thanks
Mahmood
05-15-2006 10:06 PM
both side is running native vlan 1 ... problem still ther...
05-15-2006 10:09 PM
Hi William,
Can you also paste the config of the other switch and specify what is the trunk ports.
Regards,
Ankur
05-15-2006 10:01 PM
Hi William,
Can you please confirm which is the native vlan on the trunk ports connecting 2 different switches.
If there is a native vlan mismatch between 2 switches it may result in dropping traffic for native vlans and also sometimes I have seen no vlans communicate when there is a native vlan.
Please confirm the native vlans on the trunk and if they are different try to change it and keep them same and see if it resolves the issue.
Regards,
Ankur
05-16-2006 06:12 AM
It looks like you are only permitting vlans 100-500. Your native vlan 1 also needs to be permitted, or you can change your native vlan to be 100. Which is what I would do.
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