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This switch supports selective qinq?
For example I got 3 vlans on client port: 100, 200, 300.
I need to add second tag on vlans 100, 200 but vlan 300 must run as is, without adding second tag.
Is it possible?
Yes it is supported - please see the answer here (for EX4200, but same behaviour can be expected on EX4550):
Juniper EX4200 QinQ question
Required, but never shown