Chapter 15: Dte-To-Dte Multilink Frame Relay - Avaya 1000 Series Configuration Manual

Chapter 15: DTE-to-DTE Multilink Frame
Multilink Frame Relay (MFR) is actually composed of two standards: FRF.15 and FRF.16. The latter is
more common and defines UNI/NNI interfaces for implementing MFR. FRF.16 is used for multiplexing
dedicated T1s in the local loop and requires compatible equipment at the carrier POP. FRF.15, or DTE-
to-DTE MFR is used for multiplexing frame relay T1s between end points without impacting POP
equipment. As a result, FRF.15 can be implemented across multiple frame relay carriers to provide
additional redundancy. This application discusses considerations for using this standard. All Secure
Routers support FRF.15 and FRF.16.
Features:
• Low cost way of providing added bandwidth to private networks
• Can be done without the knowledge of the Frame Relay provider
• Scalable bandwidth using MFR for customers based on T1 access
• Traffic can be routed or switched using Frame Relay at the end points
A customer desiring to implement DTE-to-DTE MFR can use the architecture illustrated in Figure 1. The
normal ordering process can be used to obtain the fame relay T1s. From the perspective of the CPE, the
SR1001s combine those different frame relay PVCs into a consolidated, larger pipe.
FRF.15 uses an aggregated virtual circuit (AVC) for the combined interface. The AVC is composed of
constituent virtual circuits (CVC) that represent the frame relay T1s ordered from the carrier(s). In this
example, the SR1001s are configured with DTE LMI; the carrier frame switches are DCE.
Figure 10: MFR Using FRF.15
In Secure Routers, CVCs are configured using the bundle construct normally used for a non-ethernet
interface. After the CVCs are configured, they can be assigned to the AVC. The AVC, frf15 in this case,
is assigned a DLCI of 100 on both ends and an IP address in the 11.1.1.0/30 subnet. The AVC names
and DLCI numbers can be different on each end if necessary. The frame switches are configured for DLCIs
Avaya Secure Router 1000 Series Configuration Guide
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