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Routing & Switching · Advanced

Symmetric IRB

EVPN inter-subnet routing where both ingress and egress VTEPs route, using a shared L3VNI per tenant VRF.

Definition

The ingress leaf routes into the L3VNI and the egress leaf routes from it to the destination VLAN, so each leaf only needs the VNIs for locally attached subnets. It scales better than asymmetric IRB and is the default in Cisco and most Junos designs.

Example

vrf context TENANT-A / vni 50001

Exam tip

Symmetric = route-bridge-route via L3VNI; needs router MAC extended community.

Related terms