Creating a Basic Configuration

To configure ATM, perform the following tasks. (Figure 3 shows the relationship of Steps 1 through 3.)

Configure an ATM physical interface.
host1(config)#interface atm 0/1
Configure an ATM 1483 subinterface.
host1(config-if)#interface atm 0/1.20
Configure a PVC by specifying the VCD, the VPI, the VCI, and the encapsulation type.
host1(config-subif)#atm pvc 10 15 22 aal5snap
Assign an IP address and subnet mask to the PVC.
host1(config-subif)#ip address 192.32.10.20 255.255.255.0
(Optional) Verify your configuration using the appropriate show commands.
host1#show atm interface atm 0/1 host1#show atm vc atm 0/1 10 host1#show atm subinterface atm 0/1.20
Figure 3: Configuring an ATM Interface, Subinterface, and PVC

atm pvc

Use to configure a PVC on an ATM interface.
Specify one of the following encapsulation types:
- aal5snap—Specifies an LLC encapsulated circuit; LLC/SNAP header precedes the protocol datagram.
- aal5mux ip—Specifies a VC-based multiplexed circuit. This option is used for IP only.
- aal5autoconfig—Enables autodetection of the 1483 encapsulation (LLC/SNAP or VC multiplexed) for dynamic interfaces. See Configuring Upper-Layer Dynamic Interfaces, for more explanation.
- ilmi—Defines the PVC for ILMI keepalive messages. You can set this option only on major interfaces. After the PVC is set up for ILMI, use atm ilmi-keepalive to cause the router to generate ILMI keepalive messages on the interface.
You can optionally set the peak, average, and burst sizes. To use VBR-RT or VBR-NRT as the service type, you must specify each of these options.
The default service type is UBR. To set a different service type, specify one of the following keywords:
- rt—Selects VBR-RT as the service type. You can select rt only if you set the peak, average, and burst parameters.
- cbr—Selects CBR as the service type. You must set the CBR rate in Kbps.
To enable VC integrity and generation of OAM F5 loopback cells on this circuit, use the oam keyword.
Example
host1(config-if)#atm pvc 6 0 11 aal5snap cbr 10000
Use the no version to remove the specified PVC.
See atm pvc.

interface atm

Use to configure an ATM interface or subinterface type.
To specify an ATM interface for ERX7xx models, ERX14xx models, and ERX310 router, use the slot/port.[subinterface ] format.
- slot—Number of the chassis slot
- port—Port number on the I/O module; on the OC3-2 GE APS I/O module, you can specify ATM interfaces only in ports 0 and 1; port 2 is reserved for a Gigabit Ethernet interface
- subinterface—Number of the subinterface in the range 1–2147483647
To specify an ATM interface for the E120 or E320 router, use the slot/adapter/port[.subinterface ] format.
- slot—Number of the chassis slot
- adapter—Identifier for the IOA within the E320 chassis, either 0 or 1, where:
  - 0 indicates that the IOA is installed in the right IOA bay (E120 router) or the upper IOA bay (E320 router)
  - 1 indicates that the IOA is installed in the left IOA bay (E120 router) or the lower IOA bay (E320 router).
- port—Port number on the IOA
- subinterface—Number of the subinterface in the range 1–2147483647
Specify the type of interface or subinterface: point-to-point or multipoint. Point-to-point is the default.
Examples
host1(config-if)#interface atm 0/1.20 host1(config-if)#interface atm 0/0/4.20
Use the no version to remove the subinterface or the logical interface.
See interface atm.