Configuring Logical Interface Properties

To configure logical interface properties, include the encapsulation statement, family statement, and vci statement:

unit logical-unit-number {encapsulation type;family inet {vci vpi-identifier.vci-identifier;}}

You can include these statements at the following hierarchy levels:

[edit interfaces interface-name unit logical-unit-number]
[edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number]

To configure the logical link-layer encapsulation type, include the encapsulation statement.

ATM-over-SHDSL interfaces that use inet (IP) protocols support the following encapsulations on the logical interface:

atm-vc-mux—Use ATM VC multiplex encapsulation. You can only configure the inet family when you use this type of encapsulation.
atm-nlpd—Use ATM network layer protocol ID (NLPD) encapsulation. You can only configure the inet family when you use this type of encapsulation.
atm-cisco-nlpd—Use Cisco NLPD encapsulation. You can only configure the inet family when you use this type of encapsulation.

ATM-over-SHDSL for PPP over ATM interfaces support the following encapsulations on the logical interface:

ATM-over-SHDSL interfaces also support the following encapsulations on the logical interface:

atm-snap—Use ATM subnetwork attachment point (SNAP) encapsulation.
atm-mlppp-llc—For ATM2 IQ interfaces only, use Multilink PPP (MLPPP) over AAL5 LLC. For this encapsulation type, your router must be equipped with a Link Services or Voice Services PIC. MLPPP over ATM encapsulation is not supported on ATM2 IQ OC48 interfaces.
ppp-over-ether-over-atm-llc—Use PPP over Ethernet over ATM LLC encapsulation. When you use this encapsulation type, you cannot configure the interface address. Instead, you configure the interface address on the PPP interface.
family—The family protocol type.
vci—The virtual channel identifier (VCI) type and value.

vci-identifier—ATM virtual circuit identifier. Unless you configure the interface to use promiscuous mode, this value cannot exceed the largest numbered VC configured for the interface with the maximum-vcs option of the vpi statement. Specify a VCI identifier from 0 through 4089 or 0 through 65,535 with promiscuous mode. VCIs from 0 through 31 are reserved.

vpi-identifier—ATM virtual path identifier. Specify a VPI from 0 through 255. The default is 0.