Figure 10: Structure Of Frame Relay Protocols; Figure 11: Serial Interface Configuration Parameters For A Frame Relay Connection - Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x System Basics Configuration Guide
Figure 10 on page 18 shows the structure of the Frame Relay protocols with the
physical layer as the foundation. For Frame Relay, the physical layer can be
channelized E1, E3, channelized T1, T3, or a fractional service, as supported by the
different line module ports. The HDLC layer is on top of the physical layer and can
support flexible assignment of physical resources.
For example, an HDLC channel can support one DS0, a fractional T1, or an entire
T1. The major Frame Relay interface sits on top of the HDLC resource, and the
subinterfaces sit on top of the major interface. The Frame Relay subinterfaces connect
to the IP interface layer.

Figure 10: Structure of Frame Relay Protocols

The router supports Frame Relay LMI (local management interface) to provide the
operator with configuration and status information relating to the Frame Relay VCs
in operation. LMI specifies a polling mechanism to receive incremental and full-status
updates from the network. The router can represent either side of the User-to-Network
Interface (UNI) and supports unidirectional LMI. Bidirectional support for the
Network-to-Network Interface (NNI) is also supported.
Figure 11 on page 18 shows sample configuration parameters for Frame Relay on
a serial interface.

Figure 11: Serial Interface Configuration Parameters for a Frame Relay Connection

The following sample command sequence configures a serial interface for Frame
Relay. See JUNOSe Link Layer Configuration Guide, for information.
18
Configuring Data Link-Layer Interfaces
host1(config)#interface serial 0/1:1/5
host1(config-if)#encapsulation frame-relay ietf
host1(config-if)#frame-relay intf-type dte
host1(config-if)#frame-relay lmi-type ansi
host1(config-if)#interface serial 0/1:1/5.1
host1(config-subif)#frame-relay interface-dlci 17 ietf
host1(config-subif)#ip address 192.32.10.2 255.255.255.0