Chapter 39. Using Binary Synchronous Relay (BRLY)
This chapter describes how to use the Binary Synchronous Relay (BRLY) protocol.
It includes the following sections:
v“BRLYOverview”
v“BRLYConsiderations” on page 564
Binary Synchronous Relay (BRLY) is a protocol that encapsulates binary
synchronous communications (BSC) traffic and transmits the traffic across IP
connections. This function permits BSC traffic to flow between BSC peers as if a
BSC connection exists between the peers. The following sections describe BRLY,
some common configurations, and how to configure a BRLYscenario.

BRLY Overview

BSC connections are similar to SDLC connections in that they consist of a primary
end-point (polling) and a secondary end-point (polled). The connections can be
either point-to-point, where the primary communicates with a single secondary, or
multipoint, where the primary communicates with multiple secondaries. BRLY
supports both physical and virtual multipoint connections.
In this implementation, the primary and secondary BSC devices are connected to
routers which then connect to each other through IP.Figure 30 is a diagram of a
point-to-point and a physical multipoint BRLYconfiguration. A physical multipoint
connection is one where all of the secondary devices are on the same physical
connection.
A virtual multipoint connection connects a single BSC primary and multiple BSC
secondaries by using different BRLYgroups (different physical connections).
Figure 31on page 562 is a diagram of a virtual multipoint configuration.
┌────────────┐ ┌─────────────┐
│Primary BSC │ │ Primary BSC │
│ Device │ │ Device │
└─────┬──────┘ └──────┬──────┘
1│ 1│
┌────┴─────┐ ┌────┴─────┐
│ Router A │ │ Router A │
└────┬─────┘ └────┬─────┘
1│IP 1│IP
┌────┴─────┐ ┌────┴─────┐
│ Router B │ │ Router B │
└────┬─────┘ └────┬─────┘
│1│
1 │ ┌────────┴───────────┐
┌─────┴──────┐ ┌────┴─────┐ ┌────┴─────┐
│ Secondary │ │Secondary │ │Secondary │
│ BSC Device │ │BSC Device│ │BSC Device│
└────────────┘ └──────────┘ └──────────┘
Point-to-Point Physical Multipoint
Figure 30. Physical BSC Relay Configurations. The numbers in the figure represent the group
numbers for BSC Relay.
© Copyright IBM Corp. 1994, 1998 561
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