Asymmetric IRB ingress VTEP
- routes the incoming packet into its destination VLAN
- bridges and tunnels the packet within the destination VLAN over to the receiving VTEP with the MAC address
Symmetric IRB ingress VTEP
- tunnels the packet over the transit VNI over to the receiving VTEP
- then: the receiving VTEP routes the packet into the correct destination VLAN and then bridges it to the destination MAC address
So while C sounds correct, the ingress VTEP doesn't do the routing, that's the job of the egress VTEP
In the provided link you can find:
With asymmetric IRB, the ingress VTEP performs both Layer-2 bridging and Layer-3 routing lookup, whereas the egress VTEP performs only Layer-2 bridging lookup.
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