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BGP-EVPN bridge domains

Andras Dosztal
Level 3
Level 3

Hi all,

I was learning about BGP-EVPN, and would need some help with bridge domains.

Q1: Can you confirm I can re-use VLAN IDs in different bridge domains on a switch for different tenants? I mean a setup like this:

Tenant A A B B
L2 VNI 30100 30200 35100 35200
Bridge domain 1 1 2 2
Leaf switchport Eth1/8 Eth1/9 Eth1/15 Eth1/16
Mapped VLAN on leaf switchport to the VNI above 100 200 100 200

This way the dot1Q header would be the same on Eth1/8 and Eth1/15, yet they still would belong to a different L2 domain (VNI) because of the different bridge domain associated to them. Am I right or missing something here?

Q2: If the answer to the above is yes, why are bridge domains available only on the N7k series and not on N9k & N5k? I mean this is an efficient way to offer all VLAN IDs to all tenants, and it doesn't even gets messy like it would with scoped leaf configuration.

Thanks in advance.

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