QuestionQ82

EVPN-VXLAN Signaling

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Both DC and DC2 use EVPN-VXLAN technology deployed with an ERB architecture. A server on the Red VLAN must communicate with a server on the Green VLAN. The Blue VLAN in DC and DC2 must be the same VLAN.

Which statement is correct?

  • A An interconnect is required between four leaf devices in the services blocks; the Red VLAN and the Green VLAN must be stitched and the Blue VLAN must be stretched.
  • B An interconnect is required between the four SRX Series devices; the Blue VLAN must be stretched and a transit VNI must be added for the Red and Green VLANs.
  • C A lean super spine device must be added to DC and DC2; all VLANs must be stretched to the lean super spine device and the lean super spine devices must stitch all the VLANs together.
  • D The eight spine devices must be configured as border spine devices; a full mush interconnect must exist between all eight spine devices and the Blue VLAN must be stitched together.
Explanation

A VLAN that must be the same broadcast domain in both data centers requires a Layer 2 EVPN/VXLAN stretch. Communication between the distinct Red and Green VLAN subnets requires Layer 3 routing in the ERB DCI design, using a transit VNI through the interconnected SRX service clusters; those VLANs are not themselves Layer 2 stitched.

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