350-601 Network Practice Question
In a VXLAN BGP EVPN fabric, which component is responsible for handling BUM traffic using ingress replication, and how does the VTEP learn the list of remote VTEPs to replicate to?
⚠ Common exam trap
Cisco often tests the misconception that the spine switch performs replication or that IGMP snooping is used for VTEP discovery, when in fact the ingress VTEP uses MP-BGP EVPN Type 3 routes to learn remote VTEPs and handle BUM traffic via ingress replication.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ingress VTEP learns remote VTEPs via MP-BGP EVPN Type 3 routes.
In a VXLAN BGP EVPN fabric, ingress replication is the default method for handling BUM traffic, where the ingress VTEP replicates packets and sends unicast copies to each remote VTEP. The ingress VTEP learns the list of remote VTEPs from MP-BGP EVPN Type 3 routes (Inclusive Multicast routes), which advertise the VNI and the originating VTEP's IP address, allowing the ingress VTEP to build its replication list.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The ingress VTEP learns remote VTEPs via IGMP snooping.
Why it's wrong here
IGMP snooping is used for multicast group membership, not for ingress replication lists.
- ✗
The egress VTEP sends unicast copies to all other VTEPs.
Why it's wrong here
Ingress replication is done by the ingress VTEP, not egress.
- ✓
The ingress VTEP learns remote VTEPs via MP-BGP EVPN Type 3 routes.
Why this is correct
Type 3 routes advertise VNI and VTEP IP, enabling ingress replication list.
- ✗
The spine switch performs replication to all leaf VTEPs.
Why it's wrong here
In ingress replication, the leaf (ingress VTEP) replicates; spine does not.
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