JN0-460 · Question #10
What are the two ways to forward BUM traffic when using EVPN? (Choose two.)
The correct answer is C. Use ingress replication. D. Use underlay replication. In EVPN-VXLAN, BUM (Broadcast, Unknown unicast, and Multicast) traffic is handled differently than unicast traffic. EVPN provides two main forwarding mechanisms to distribute BUM traffic between VTEPs (VXLAN Tunnel Endpoints): "BUM traffic in EVPN-VXLAN fabrics is replicated…
Question
What are the two ways to forward BUM traffic when using EVPN? (Choose two.)
Options
- AUse static routes.
- BUse BGP neighborship.
- CUse ingress replication.
- DUse underlay replication.
How the community answered
(30 responses)- A13% (4)
- B7% (2)
- C80% (24)
Explanation
In EVPN-VXLAN, BUM (Broadcast, Unknown unicast, and Multicast) traffic is handled differently than unicast traffic. EVPN provides two main forwarding mechanisms to distribute BUM traffic between VTEPs (VXLAN Tunnel Endpoints): "BUM traffic in EVPN-VXLAN fabrics is replicated using either ingress replication or underlay multicast (PIM-based). Both methods ensure that broadcast and unknown unicast frames reach all remote VTEPs within the same VXLAN segment." Option A: Incorrect -- static routes are unrelated to BUM forwarding. Option B: Incorrect -- BGP is the control plane, not a data-plane forwarding method. Option C: Correct -- Ingress replication replicates BUM packets to all remote VTEPs in the same VNI using unicast tunnels. Option D: Correct -- Underlay replication (multicast) uses multicast groups in the IP underlay to distribute BUM frames efficiently.
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