By default, PICs on T-series, MX-series, and M320 platforms are restricted to a maximum of four egress queues per interface. You can enable eight egress queues on some interfaces by including the max-queues-per-interface statement at the [edit chassis fpc slot-number pic pic-number] hierarchy level:
- [edit chassis fpc slot-number pic pic-number]
- max-queues-per-interface (4 | 8);
The numerical value can be 4 or 8.
For J-series platforms, this statement is not supported. J-series platforms always have eight queues available.
The max-queues-per-interface statement is supported on the following PICs:
To determine how many queues an interface supports, you can check the CoS queues output field of the show interfaces interface-name extensive command:
user@host> show interfaces so-1/0/0 extensive
CoS queues: 8 supported
If you include the max-queues-per-interface statement, all ports on the PIC use the configured maximum. When you change between four queues and eight queues, all physical interfaces on the PIC are deleted and re-added.
For 4-port OC3c/STM1 Type I and Type II PICs on M320 and T-series platforms, when you include the max-queues-per-interface 8 statement, you can configure up to eight queues on ports 0 and 2. After you commit the configuration, the PIC goes offline and comes back online with only ports 0 and 2 operational. No interfaces can be configured on ports 1 and 3. If you do not include the max-queues-per-interface statement or if you include the max-queues-per-interface 4 statement, you can use all four ports and configure up to four queues per port.
For more information, see the JUNOS System Basics Configuration Guide.