Discover the actions performed by the ingress VTEP on traffic between EVPN VXLAN overlays for asymmetric and symmetric IRB scenarios. Learn about routing, bridging, and tunneling in this comprehensive explanation.
Table of Contents
Question
Which action does the ingress VTEP perform on traffic between EVPN VXLAN overlays?
A. routing and bridging when doing asymmetric IRB
B. bridging when doing symmetric IRB
C. routing and tunneling when doing symmetric IRB
D. routing when doing asymmetric IRB
Answer
B. bridging when doing symmetric IRB
Explanation
In an EVPN VXLAN overlay with symmetric Integrated Routing and Bridging (IRB), the ingress Virtual Tunnel Endpoint (VTEP) performs bridging on the traffic. When a packet arrives at the ingress VTEP, it is bridged to the appropriate VXLAN tunnel based on the destination MAC address. The packet is then encapsulated with a VXLAN header and forwarded to the egress VTEP over the underlay network. The egress VTEP decapsulates the packet and bridges it to the destination host within the same Layer 2 domain. Symmetric IRB keeps the routing function on the ingress and egress VTEPs, allowing for optimal traffic forwarding between EVPN VXLAN overlays.
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