Link Services IQ Interfaces Configuration Guidelines

You can configure link services intelligent queuing (IQ) (LSQ or lsq-) interfaces on the Adaptive Services (AS) PIC, the internal Adaptive Services Module in the M7i platform, the Link Services II PIC, and the MultiServices PIC. LSQ interfaces are similar to link services interfaces, which are described in Multilink and Link Services Logical Interface Configuration Overview. The important difference is that LSQ interfaces fully support JUNOS class of service (CoS) components.

The AS or MultiServices PIC has a limit of 1023 logical interfaces. Each logical interface is a Multilink Point-to-Point Protocol (MLPPP) bundle, an FRF.15 bundle, or an FRF.16 DLCI.

This chapter describes the Layer 2 service package and the CoS and failure recovery capabilities of LSQ interfaces. For detailed information about Layer 3 services, see other chapters in this manual and the JUNOS Feature Guide.

Note: The Link Services II PIC offers the same functionality as the Layer 2 service package on AS or MultiServices PICs.

This chapter contains the following sections:

• Layer 2 Service Package Capabilities and Interfaces
• Configuring LSQ Interface Redundancy Across Multiple Routers Using SONET APS
• Configuring LSQ Interface Redundancy in a Single Router Using SONET APS
• Configuring LSQ Interface Redundancy in a Single Router Using Virtual Interfaces
• Configuring CoS Scheduling Queues on Logical LSQ Interfaces
• Configuring CoS Fragmentation by Forwarding Class on LSQ Interfaces
• Reserving Bundle Bandwidth for Link-Layer Overhead on LSQ Interfaces
• Configuring Multiclass MLPPP on LSQ Interfaces
• Oversubscribing Interface Bandwidth on LSQ Interfaces
• Configuring Guaranteed Minimum Rate on LSQ Interfaces
• Configuring Link Services and CoS on Services PICs
• Configuring Link Services and CoS on J-series Services Routers
• Configuring LSQ Interfaces as NxT1 or NxE1 Bundles Using MLPPP
• Configuring LSQ Interfaces as NxT1 or NxE1 Bundles Using FRF.16
• Configuring LSQ Interfaces for Single Fractional T1 or E1 Interfaces Using MLPPP and LFI
• Configuring LSQ Interfaces for Single Fractional T1 or E1 Interfaces Using FRF.12
• Configuring LSQ Interfaces as NxT1 or NxE1 Bundles Using FRF.15
• Configuring LSQ Interfaces for T3 Links Configured for Compressed RTP over MLPPP
• Configuring LSQ Interfaces as T3 or OC3 Bundles Using FRF.12
• Configuring LSQ Interfaces for ATM2 IQ Interfaces Using MLPPP