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Routing & Switching · Advanced

Asymmetric IRB

EVPN inter-subnet routing where the ingress VTEP routes and bridges into the destination VNI, and the egress VTEP only bridges.

Definition

Every VTEP must be configured with every VNI and subnet that its hosts may communicate with, which limits scale. It is simpler conceptually and uses no L3VNI.

Example

A leaf with all VLANs 10-50 configured routes directly into VNI 10050.

Exam tip

Asymmetric requires all VNIs on all leaves; symmetric does not.

Related terms