BIG-IP vWire Configuration
Published Jan 21, 2020
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VLAN 4096 is a reserved VLAN number that represents a wildcard. Basically the 4096 VLAN allows all tagged traffic to traverse the BIG-IP.
Adding a specific VLAN number (VLAN 501 in this case) allows the administrator to associate a listener to that specific VLAN. For example if this is deployed with F5's SSL inspection product, you can associate a service chain/topology to that specific VLAN and associate another service-chain/topology to another VLAN (602?).
I hope this answers your question.