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On 15/10/2015 18:36, Joseph Mays wrote:
Dealing with a mysterious vlan that won't work, right next to an identically configured VLAN on all the same equipment that works fine.
Are you sure on Switch B that both links to Router B are dot1Q? Looks like one might be ISL:

=================================================================================
On Switch B

interface FastEthernet0/1
description to gw1.armplc
duplex full
speed 100
switchport trunk encapsulation dot1q
switchport mode trunk
no cdp enable
!
interface FastEthernet0/10
description Hatteras 1 - HN408-U
switchport trunk encapsulation dot1q
^^^^^^^^^^^^^^^^^^^^^^^^^^
switchport trunk allowed vlan 1,808,1002-1005
switchport mode trunk
no cdp enable
!
interface FastEthernet0/17
description UNUSED
duplex full
speed 100

^^^^^ no dot1Q
switchport trunk allowed vlan 1,888,1002-1005
switchport mode trunk
no cdp enable


Matt

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