Configuring Encapsulation

Voice services interfaces support the following logical interface encapsulation types:

• Multilink Point-to-Point Protocol (MLPPP), which is the default encapsulation
• ATM2 IQ MLPPP over AAL5 LLC
• Frame Relay PPP

For general information on encapsulation, see the JUNOS Network Interfaces Configuration Guide. You can also configure physical interface encapsulation on voice services interfaces.

To configure voice services encapsulation, include the encapsulation statement:

For voice services interfaces, the valid options are atm-mlppp-llc, frame-relay-ppp or multilink-ppp.

You can configure this statement 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]

You must also configure the physical interface with the corresponding encapsulation type, either Frame Relay or PPP. LSQ interfaces are supported by the following physical interface types: ATM2 IQ, DS3, E1, E3, OC3, OC12, STM1, and T1, including the channelized versions of these interfaces. For examples, see Examples: Configuring Voice Services.

Note: The only protocol type supported with frame-relay-ppp encapsulation is family mlppp.