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Enabling Eight Queues on Interfaces

By default, the T-series, MX-series, and M320 platforms are restricted to a maximum of four egress queues per interface. Some PICs, such as the IQ2 and IQ2E PICs, have eight egress queues enabled by default. You configure the number of 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
IQ2E PICs
IQE 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.

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