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Interface Types That Do Not Support CoS
For original Channelized OC12 PICs, limited CoS functionality is supported. For more information, contact Juniper Networks customer support.
The standard Junos CoS hierarchy is not supported on ATM interfaces. ATM has traffic-shaping capabilities that would override CoS, because ATM traffic shaping is performed at the ATM layer and CoS is performed at the IP layer. For more information about ATM traffic shaping and ATM CoS components, see the Junos Network Interfaces Configuration Guide.
 | Note: Transmission scheduling is not supported on 8-port, 12-port, and 48-port Fast Ethernet PICs. |
You can configure CoS on all interfaces, except the following:
- cau4—Channelized STM1 IQ interface (configured on the Channelized STM1 IQ PIC).
- coc1—Channelized OC1 IQ interface (configured on the Channelized OC12 IQ PIC).
- coc12—Channelized OC12 IQ interface (configured on the Channelized OC12 IQ PIC).
- cstm-1—Channelized STM1 IQ interface (configured on the Channelized STM1 IQ PIC).
- ct1—Channelized T1 IQ interface (configured on the Channelized DS3 IQ PIC or Channelized OC12 IQ PIC).
- ct3—Channelized T3 IQ interface (configured on the Channelized DS3 IQ PIC or Channelized OC12 IQ PIC).
- ce1—Channelized E1 IQ interface (configured on the Channelized E1 IQ PIC or Channelized STM1 IQ PIC).
- dsc—Discard interface.
- fxp—Management and internal Ethernet interfaces.
- lo—Loopback interface. This interface is internally generated.
- pe—Encapsulates packets destined for the rendezvous point router. This interface is present on the first-hop router.
- pd—De-encapsulates packets at the rendezvous point. This interface is present on the rendezvous point.
- vt—Virtual loopback tunnel interface.
Note: For channelized interfaces, you can configure CoS on channels, but not at the controller level. For a complex configuration example, see the Junos Feature Guide.
