JN0-649: Enterprise Routing and Switching, Professional (JNCIP-ENT)Demo

By Juniper · Question Mode

QuestionQ17

EVPN

Click the Exhibit button.

You are troubleshooting an EVPN-VXLAN IP fabric and observe the loop illustrated in the exhibit. Which two actions would you take to further troubleshoot this issue?

Question Image

Choose two
  • A Verify that the same ESI is configured on the link from the host and that it matches the source.
  • B Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 4 routes are present.
  • C Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 3 routes are present.
  • D Verify that the same ESI is configured on the two links from the source.
Explanation

A multihomed Ethernet segment requires the same ESI on every leaf interface connected to that segment. EVPN Type 4 Ethernet Segment routes let the multihomed leaf devices discover one another and support designated-forwarder behavior, preventing duplicate BUM forwarding toward the shared segment. Therefore, confirm the ESI matches on the two source links and confirm that Leaf2 has Type 4 routes in bgp.evpn.0. Type 3 routes provide inclusive multicast/BUM distribution but do not establish the Ethernet-segment peer relationship.

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