License Information:

• License Model: S-MX-4C-P1-D-P
• Description: SW, MX, 1x400GE ports, Premium1, SoD (Scale on Demand), Requires license compliance technology, without Customer Support (CS SKU must be purchased separately), Perpetual.

root@MX10008> show system alarms    

1 alarms currently active

Alarm time               Class  Description

2025-03-05 06:00:55 +03  Minor  570 Advanced Bandwidth (in gbps) - MXs(315) require a license

Kindly note that when one unit of this license is applied, it will allocate 400Gb of premium bandwidth feature to the device. This can be verified by running the show system license command, where you’ll see the current usage and installed count.

root@MX10008> show system license | no-more

License usage:
                                Licensed    Licensed   Licensed

                                 Feature     Feature    Feature

 Feature name                      used   installed     needed   Expiry

Advanced Bandwidth (in gbps) - MX    5370        0         570  invalid

Premium Bandwidth (in gbps) - MX       0      4800          0   permanent


In the above output 12 licenses have been applied, hence the installed count is 3800.

Starting from Junos 22.2R1, bandwidth license has been introduced. The license installed on your device is for the Premium license, which can also accommodate the Advanced bandwidth features.

If the Premium license is installed on the device, it is sufficient to support the Advanced Bandwidth feature set, and no additional license is required. However, if the combined usage of the Advanced Bandwidth and Premium Bandwidth exceeds the installed license, an alarm will be triggered.

Advanced Bandwidth tracking begins once an advanced feature is in use. When an advanced bandwidth feature is active, all ports on the device are considered "Advanced," unless another Premium Bandwidth feature is configured. If a Premium Bandwidth feature is configured, its applicability is determined at the port, line card, or chassis level.

• Port-Level Premium Feature: When a Premium feature is applied at the port level, only the configured ports will be considered Premium. All other ports will remain Advanced.
• Line Card-Level Premium Feature: When a Premium feature is applied at the line card level, all ports on the line card are considered Premium.
• Chassis-Level Premium Feature: When a Premium feature is applied at the chassis level, all ports across the chassis are considered Premium.

For Example:

• 2 active ports of 10G each on FPC1 and 3 active ports of 10G each on FPC2. Advance feature configured(ex: BGP), Premium feature (line card level)(ex: Inline JFLOW) configured on a port of FPC1. All active ports of FPC1 will be considered Premium. All other active ports on the chassis will be Advanced.
• Advance BW = 30G
• Premium BW = 20G
• 2 active ports of 10G each on FPC1 and 3 active ports of 10G each on FPC2. Advance feature configured(ex: BGP), Premium feature (chassis-level)(ex: SRV6) configured on a port of FPC1. All active ports on the chassis will be considered Premium. No ports as Advanced.
• Advance BW = 0G
• Premium BW = 50G

To know which feature falls for the advance and premium feature set, please refer to the link - Software Licenses for MX Series Routers and MPC Service Cards - Juniper Documentation

When the utilization of bandwidth crosses the installed limit below alarm will be noticed,

root@MX10008> show system alarms    

1 alarms currently active

Alarm time               Class  Description

2025-03-05 06:00:55 +03  Minor  570 Advanced Bandwidth (in gbps) - MXs(315) require a license

To clear this alarm, the user will have to purchase additional license and add it to the device.

You may also use below show commands to check the bandwidth utilisation per port basis or fpc basis,

show system license

show system license detail

show system license fpc

show system license bandwidth

show system license bandwidth fpc <fpc-number>

show system license bandwidth fpc port-detail <fpc-number>

show system alarms