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## QoS Platform Considerations

QoS is supported on all E-series line modules except for the ES2 10G Uplink LM.

Figure 1 shows the traffic flow through the router.

Figure 1: Traffic Flow Through an E-series Router

For information about the modules supported on E-series routers:

- See the ERX Module Guide for modules supported on ERX-7xx models, ERX-14xx models, and the ERX-310 router.
- See the E120 and E320 Module Guide for modules supported on the E120 router and the E320 router.

## Interface Specifiers

The majority of the configuration task examples in this topic collection use the slot/port format to specify an interface. However, the interface specifier format that you use depends on the router that you are using.

For ERX-7xx models, ERX-14xx models, and ERX-310 routers, use the slot/port format. For example, the following command specifies an ATM interface on slot 0, port 1 of an ERX-7xx model, ERX-14xx model, or ERX-310 router.

`

host1(config)#interface gigabitEthernet 0/1

`

For E120 and E320 routers, use the slot/adapter/port format, which includes an identifier for the bay in which the I/O adapter (IOA) resides. In the software, adapter 0 identifies the right IOA bay (E120 router) and the upper IOA bay (E320 router); adapter 1 identifies the left IOA bay (E120 router) and the lower IOA bay (E320 router). For example, the following command specifies a10-Gigabit Ethernet interface on slot 5, adapter 0, port 0 of an E320 router.

`

host1(config)#interface tenGigabitEthernet 5/0/0

`

#### Related Topics

- For more information about supported interface types and specifiers on E-series routers, see Interface Types and Specifiers

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