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Configuring Logical Interface Properties

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

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-ppp-llc—Use ATM PPP over AAL5 logical link control (LLC) encapsulation.
• atm-ppp-vc-mux—Use PPP over ATM AAL5 multiplex encapsulation.

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.