JUNOSe 9.1.x Link Layer Configuration Guide > Configuring ATM > Creating a Basic Configuration

Creating a Basic Configuration

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

1. Configure an ATM physical interface.

host1(config)#interface atm 0/1 

2. Configure an ATM 1483 subinterface.

host1(config-if)#interface atm 0/1.20

3. Configure a PVC by specifying the VCD, the VPI, the VCI, and the encapsulation type.

host1(config-subif)#atm pvc 10 15 22 aal5snap

4. Assign an IP address and subnet mask to the PVC.

host1(config-subif)#ip address 192.32.10.20 255.255.255.0

5. (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 Chapter 15, Configuring 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 the atm ilmi-keepalive command 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.

interface atm

• Use to configure an ATM interface or subinterface type.
• To specify an ATM interface for ERX-7xx models, ERX-14xx models, and ERX-310 routers, 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 router or the 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.