Cisco Cisco IOS Software Release 12.0(13)S7

Mode 2—Allows 8 queues per interface. When 8 queues per port are in operation, only half the 
number of interfaces are possible (504).

The default is 4 queues. To switch to 8 queues per port, use the hw-mod slot <slot num> qos interfaces 
queues 8 command. You are prompted to reset the line card. To reset the line card, use the hw-mod slot 
<slot num> reload command. When the line card comes up, 8 queues are assigned to each interface.

To revert to 4 queues per interface, use the no form of the hw-mod slot <slot num> qos interfaces 
queues 8 command. You are prompted to reset the line card. To reset the line card, use the hw-mod slot 
<slot num> reload command. When the line card comes up, 4 queues are assigned to each interface.

Customers can now choose between configuring 4 queues per interface with 1008 interfaces or 8 queues 
per interface with 504 interfaces.

Using 8 queues per interface restricts the number of possible interfaces to 504, which is half the amount 
of interfaces that are possible in 4 queue mode.

Cisco IOS Quality of Service (QoS) Solutions for Cisco 12000 series routers

For information on configuring multicast traffic, refer to:

Also refer to the Installation and Configuration Guide for a specific Cisco 12000 series router.

The QoS on 8 Queues per Port feature is supported on the following Engine 5 SPAs and line cards on 
Cisco IOS Release 12.0(26)S on Cisco 12000 series routers:

4-port Gigabit Ethernet

The QoS on 8 Queues per Port feature is supported on the following Engine 5 SPAs and line cards on 
Cisco IOS Release 12.0(32)S on Cisco 12000 series routers:

1-port Channelized OC12/STM-1 to DS1/E1