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Enabling Eight Queues on Interfaces

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:

2-port ATM2 IQ OC3
4-port ATM2 IQ OC3
2-port ATM2 IQ E3
4-port ATM2 IQ E3
2-port ATM2 IQ DS3
4-port ATM2 IQ DS3
1-port ATM2 IQ OC12
2-port ATM2 IQ OC12
1-port ATM2 IQ OC48
2-port Channelized DS3 IQ
4-port Channelized DS3 IQ
10-port Channelized E1 IQ
10-port Channelized T1 IQ
1-port Channelized OC12 IQ
1-port Channelized STM1 IQ
2-port Channelized STM1 IQ
4-port E3 IQ
1-port Gigabit Ethernet IQ
2-port Gigabit Ethernet IQ
8-port Gigabit Ethernet IQ2
4-port Gigabit Ethernet IQ2
1-port 10-Gigabit Ethernet IQ2
1-port 10-Gigabit Ethernet IQ2, Type 3
8-port Gigabit Ethernet IQ2, Type 3
4-port SONET OC3
4-port SONET OC3 for the M160 platform

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.

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