Question

A network engineer is deploying inter-subnet routing across a VXLAN EVPN fabric that spans leaf switches from multiple vendors. Traffic must be routed between VNIs on the ingress and egress leaves, and the design must minimize the number of Layer 3 VNIs (VRF configuration) required on every leaf so that a leaf only needs the configuration for locally attached subnets. Which integrated routing and bridging (IRB) model should the engineer implement?

Accepted Answer

Symmetric IRB, where both ingress and egress leaves route into a common L3VNI associated with the VRF

Answer

Asymmetric IRB, where the ingress leaf performs both routing and bridging into the destination L2VNI

Answer

Centralized routing on a pair of border leaves acting as the default gateway for all subnets

Answer

Flood-and-learn VXLAN with an external router-on-a-stick for inter-VLAN routing