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Juniper vMX#

Juniper vMX virtualized router is identified with vr-vmx kind in the topology file. It is built using vrnetlab project and essentially is a Qemu VM packaged in a docker container format.

vr-vmx nodes launched with containerlab comes up pre-provisioned with SSH, SNMP, NETCONF and gNMI services enabled.

Managing vr-vmx nodes#


Containers with vMX inside will take ~7min to fully boot.
You can monitor the progress with docker logs -f <container-name>.

Juniper vMX node launched with containerlab can be managed via the following interfaces:

to connect to a bash shell of a running vr-vmx container:

docker exec -it <container-name/id> bash

to connect to the vMX CLI

ssh [email protected]<container-name/id>

NETCONF server is running over port 830

ssh [email protected]<container-name> -p 830 -s netconf

using the best in class gnmic gNMI client as an example:

gnmic -a <container-name/node-mgmt-address> --insecure \
-u admin -p [email protected] \


Default user credentials: admin:[email protected]

Interfaces mapping#

vr-vmx container can have up to 90 interfaces and uses the following mapping rules:

  • eth0 - management interface connected to the containerlab management network
  • eth1 - first data interface, mapped to first data port of vMX line card
  • eth2+ - second and subsequent data interface

When containerlab launches vr-vmx node, it will assign IPv4/6 address to the eth0 interface. These addresses can be used to reach management plane of the router.

Data interfaces eth1+ needs to be configured with IP addressing manually using CLI/management protocols.

Features and options#

Node configuration#

vr-vmx nodes come up with a basic configuration where only the control plane and line cards are provisioned, as well as the admin users and management interfaces such as NETCONF, SNMP, gNMI.

Lab examples#

The following labs feature vr-vmx node:

Known issues and limitations#

  • when listing docker containers, vr-vmx container will always report unhealthy status. Do not rely on this status.
  • vMX requires Linux kernel 4.17+
  • To check the boot log, use docker logs -f <node-name>.

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