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How bad is doing a back-to-back connection to do VLAN mapping (vlan-stacking limitation)?

        the object sounds like a newbie questions but there are good reason for it in the context of bridge-domains and vlan-stacking.
Here below a picture to give a bit of context Switch with VLAN mapping through back-to-back cable In short I realized that on the Huawei S5700 family for VLANs linked to bridge-domain I cannot use vlan-stacking. The goal is to have tagged and untagged frames entering from the physical ports being properly marked stacked and then incapsulated into VxLAN. Hence the idea to define two VLANs, one (4063) dedicated for vlan-stacking and the other one (4064 ) to be linked to the bridge-domain and the link between them esternal. Is that bad? And how much? Alex

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