JNCIE-DC case studies
JNCIE-DC · Put your knowledge to work in context.
JNCIE-DC is Juniper's expert-level certification for data center engineers, aimed at people who already design, build, and operate EVPN-VXLAN fabrics on Junos and want formal recognition at the highest tier. Unlike a multiple-choice associate or specialist exam, this is a hands-on lab practical: you receive a scenario and a live or simulated topology and must configure, verify, and troubleshoot it against stated requirements within the time allowed. The JNCIE-DC case studies are 5 cases and about 3,060 words.
1Four-Spine Fabric Sizing and STP-Free Migration
Your company is replacing a 3-tier STP network with a Juniper EVPN-VXLAN spine-leaf fabric for a single data center. The design has 12 racks, each with two 48-port 25G leaf switches, and four 100G spine switches.
672 words, about 3 min2EVPN Route-Target Mismatch Across Two PODs
Two PODs in the same data center use separate underlay ASNs: POD-A leaf AS 65101, POD-B leaf AS 65201, with shared spines using AS 65000. Each POD has its own EVPN overlay; VLAN 110 maps to VNI 5010 in both PODs.
640 words, about 3 min3eBGP Underlay ECMP Collapse After OSPF Migration
After migrating a 16-leaf, 4-spine fabric from OSPF to eBGP, remote VTEP loopback reachability works but ECMP has collapsed. Each leaf has four equal-cost underlay paths to every remote leaf loopback, but show route 10.255.0.22/32 on leaf1 lists only one next-hop via spine2.
540 words, about 3 min4L3 DCI with a Stretched Legacy VLAN
DC1 and DC2 are 15 ms apart and each has a Juniper EVPN-VXLAN fabric with a border leaf pair. The company wants Layer 3 DCI for 400 subnets and one stretched VLAN 200 for a legacy application.
606 words, about 3 min5ESI-LAG Blackhole After Leaf2 Upgrade
A dual-homed database server connects with a 2-member ESI-LAG to leaf1 and leaf2 in an EVPN multihoming all-active fabric. The server uses VLAN 110, VNI 5010, and sends both unicast and multicast traffic.
602 words, about 3 min