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If tagged VLAN traffic is to pass through a virtual wire pair, an option must be enabled for this to occur; otherwise, this traffic is dropped (and cannot be seen in a sniffer).
The required option is as follows:
config system virtual-wire-pair
edit <name_of_virtual_wire_pair>
set wildcard-vlan enable
This can be further filtered to permit only the VLANs that should pass through the wire pair:
For example, to only permit VLANs 100 & 200:
set vlan-filter <100,200>
Or, to allow ALL VLANs, set the range to the full permissible range of VLANs (0 to 4094) as follows:
set vlan-filter <0-4094>
Virtual wire pairs.
Note:
wildcard-vlan and vlan-filter must be configured even when using VLAN interfaces in the VWP to allow tagged traffic through the VWP.
Related article:
Technical Tip: Virtual wire pairs
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