Configuring the Junos OS to Support Eight Queues on IQ Interfaces for T Series and M320 Routers
By default, IQ PICs on T Series and M320 routers
are restricted to a maximum of four egress queues per interface. To
configure a maximum of eight egress queues on IQ interfaces, include
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 (8 | 4);
On a TX Matrix or TX Matrix Plus router, include
the max-queues-per-interface statement at the [edit
chassis lcc number fpc slot-number pic pic-number] hierarchy level:
[edit chassis lcc number fpc slot-number pic pic-number] max-queues-per-interface (8 | 4);
The configuration at the [edit class-of-service] hierarchy level must also support eight queues per interface.
The maximum number of queues per IQ PIC can be
4 or 8. If you include the max-queues-per-interface statement,
all ports on the IQ PIC use configured mode and all interfaces on
the IQ PIC have the same maximum number of queues.
If you include the max-queues-per-interface
4 statement, you can configure all four ports and configure
up to four queues per port.
For 4-port OC3c/STM1 Type I and Type II PICs on
M320 and T Series routers, 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.
For Quad T3 and Quad E3 PICs, 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.
Starting from Junos OS Release 14.1R8, 14.2R6, 15.1F6, 15.1R3,
15.1R4, and 16.1R1, the restricted queue PICs without the max-queues-per-interface configuration boot up with a maximum of eight queues per port and
two operational ports (port 0 and 2). PICs with restricted queues
include Quad T3 PIC, Quad E3 PIC, 4-port SONET/SDH OC3c/STM1 PIC,
and 4-Port OC3 and 1-port OC12 PICs with SFP.
When you include the max-queues-per-interface statement and commit the configuration, all physical interfaces
on the IQ PIC are deleted and readded. Also, the PIC is taken offline
and then brought back online immediately. You do not need to take
the PIC offline and online manually. You should change modes between
four queues and eight queues only when there is no active traffic
going to the IQ PIC.