MX Flex License queries arising for a Junos upgrade from older releases to Junos 23.2R1 and later versions.

The following alarm issue might be observed after upgrading to Junos 23.2R1 or higher. The "ADVANCE Bandwidth" shows only 10G available for the license.

root@MX-Router> show system alarms

1 alarms currently active

Alarm time Class Description

2026-03-27 00:41:12 CAT Minor 900 ADVANCE Bandwidth (in gbps)s(315) require a license

From the show system license output, we can see there is only 10G for the bandwidth:

root@MX-Router> show system license

License usage:

                 Licensed   Licensed  Licensed

                 Feature   Feature   Feature

 Feature name            used  installed   needed  Expiry

 scale-subscriber           0      10      0  permanent

 scale-l2tp              0     1000      0  permanent

 bgp                  1      1      0  permanent

 isis                 1      1      0  permanent

 bfd-liveness-detection        1      1      0  permanent

 connectivity-fault-management     0      1      0  permanent

 vrrp                 1      1      0  permanent

 dot1q-tunneling            0      1      0  permanent

 services-rpm             0      1      0  permanent

 mobile-next-scaling          0     1000      0  permanent

 mobile-next-http-app-scaling     0     1000      0  permanent

 mobile-next-policy-prepaid-scaling    0   1000     0  permanent

 vpls                 0      1      0  permanent

 l3vpn                 1      1      0  permanent

 mobile-next-DPI-base         0     1000      0  permanent

 vxlan                 0      1      0  permanent

 PCEP                 0      1      0  permanent

 mc-lag                0      1      0  permanent

 esi-lag                0      1      0  permanent

 link-fault-management         0      1      0  permanent

 ldp                  1      1      0  permanent

 rsvp                 0      1      0  permanent

 l2circuit               1      1      0  permanent

 l3static               1      1      0  permanent

 l3vpn-instance-capacity       18      32      0  permanent

 evpn-vxlan              0      1      0  permanent

 igmp-multicast            0      1      0  permanent

 evpn-mpls               0      1      0  permanent

 sr                  0      1      0  permanent

 pim                  0      1      0  permanent

 gre_tunnel              0      1      0  permanent

 static-mpls              0      1      0  permanent

 rip                  0      1      0  permanent

 ospf                 1      1      0  permanent

 qos-license              0      1      0  permanent

 mplsoudp               0      1      0  permanent

 ipinip                0      1      0  permanent

 bgp-pic                0      1      0  permanent

 PWHT L2                0      1      0  permanent

 ADV Bandwidth (in gbps)       900      10     890  permanent

 cBNG Lite UP License         0     100      0  permanent

 mvpn-instance-capacity        0      8      0  permanent

Regard

This happens when the customer is using the incorrect license for their version. The customer needs to download the correct license from the portal for 23.2R1 releases and higher:

How can customers get the new license keys if they are using flex line cards/devices?

Answer> Customer should have received an activation code to use with the license portal. At the portal, they enter the code, the chassis serial number, and a license is generated.

https://supportportal.juniper.net/s/article/Junos-License-Activate-and-Install

Before a Junos upgrade, if a customer wants to know whether they are using a flex or a non-flex device, what is the easiest way they can get to know?

Answer> There is no CLI command available to identify/differentiate the device.

This document lists the ‘flex-only’ line cards on page 4: https://www.juniper.net/documentation/us/en/software/license/flex/flex-license-for-mx-series-routers-and-mpc-service-cards.pdf. In addition to compact MX systems, only MX304 is flex-only.