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JNCIS-ENT lab 3 of 17

Inter-VLAN routing with IRB and DHCP

Route between the staff and guest VLANs on the switch itself with IRB interfaces, then let the guest VLAN's PCs get their addresses from a DHCP server running on the same switch.

Run this lab

It needs Lite: its 3 nodes are set to 6 vCPU and 7,168 MB in total. That fits the free demo too.

In your workspace: Shared, then JNCIS-ENT JN0-352 guided labs, then 03 - Inter-VLAN routing with IRB and DHCP

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Level
Intermediate
Time
About 45 minutes
Nodes need
6 vCPU, 7,168 MB
Smallest plan
Lite

The scenario

SW1 already has two VLANs: STAFF (PC1, with a fixed address) and GUEST (PC2, not yet addressed). Staff need to reach the guest network to support visitors' devices, so SW1 must route between the VLANs. The guest VLAN must also hand out addresses automatically.

VLANSubnetSW1 gatewayHosts
STAFF (10)10.10.10.0/24irb.10 10.10.10.1PC1 10.10.10.11 (static)
GUEST (20)10.20.20.0/24irb.20 10.20.20.1PC2 by DHCP, pool 10.20.20.100 to 10.20.20.149, DNS 10.10.10.53

What you’ll practise

  • Explain the options for inter-VLAN routing and why a Layer 3 switch uses IRB interfaces
  • Create IRB interfaces and bind them to VLANs with l3-interface
  • Verify inter-VLAN routing with the routing table, ARP and ping
  • Run a DHCP server for a VLAN on its IRB interface

The tasks

  1. Ways to route between VLANs
  2. IRB interfaces
  3. A DHCP server on the switch
  4. Route between the VLANs

The Lab Tasks pane has the scenario, these tasks, the checks to run, hints and the full solution.

Topology and devices

The network as it opens in EVE-NG, drawn from the lab’s own canvas, and the image each node runs.

Topology of Inter-VLAN routing with IRB and DHCP3 nodes, 2 links. Every link is listed as text below the diagram.SW1PC1PC2ge-0/0/0eth0ge-0/0/1eth0
3 nodes, with the interface names each link uses.
Every link, as text
  • SW1 ge-0/0/0 to PC1 eth0
  • SW1 ge-0/0/1 to PC2 eth0
Nodes in Inter-VLAN routing with IRB and DHCP, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
SW1Juniper vJunos-switchvjunosswitch-23.4R2-S2.14 vCPU, 5,120 MB
PC1VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB
PC2VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB

How to open this lab

  1. Sign in to your workspace at lab.cloudlabbox.com.

  2. In File Manager, open Shared, then the folder JNCIS-ENT JN0-352 guided labs.

  3. Open 03 - Inter-VLAN routing with IRB and DHCP and start its nodes, then open Lab Tasks for the scenario and the steps.

The lab is read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change it, rebuild it in your own folder.

More JNCIS-ENT labs

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CloudLabBox is independent of Juniper Networks. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.