Software User's Guide Version 3.3

Using Binary Synchronous Relay (BRLY)

This chapter describes how to use the Binary Synchronous Relay (BRLY) protocol. It includes the following sections:

BRLY Overview
BRLY Considerations

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 BRLY scenario.

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 31 is a diagram of a point-to-point and a physical multipoint BRLY configuration. 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 BRLY groups (different physical connections). Figure 32 is a diagram of a virtual multipoint configuration.

Figure 32. Virtual BSC Relay Multipoint Configuration

.-----------. |Primary BSC| | Device | '---.----.--' 1 .-'----'-. 2 |Router A| '-.----.-' | | 1 | | 2 .-'----'-. |Router B| '-.-----.' | | 1 | | 2 .--------'-. .-'---------. |Secondary | | Secondary | |BSC Device| | BSC Device| '----------' '-----------'

BSC Relay also supports a combination of virtual and physical multipoint connections. Figure 33 is a diagram of a combination of virtual and physical multipoint connections.

Figure 33. Combination Virtual and Physical BRLY Multipoint Configuration

.-----------. |Primary BSC| | Device | '-----.-----' 1 | 2 .---------------'----------------. | Router A | '----.-----------------------.---' | | 1 | 2 | .------'----. .----'-----. | Router B | | Router C | '-.---------' '-.--------' 1 +-------. 2 +-------. .-------'--. | .-----'----. | |Secondary | | |Secondary | | |BSC Device| | |BSC Device| | '----------' | '----------' | .--'-------. .-'--------. |Secondary | |Secondary | |BSC Device| |BSC Device| '----------' '----------'

Sample BRLY Configuration

The following examples illustrate configuring a BRLY network similar to the network in Figure 33. These examples use the following assumptions:

Interface 1 on Routers A, B, and C have already been configured as BSC interfaces.
The IP address for the Primary BSC Device's local port is 6.6.6.4.
The IP address for the Router B's Secondary BSC devices local port is 6.6.6.1.
The IP address for the Router C's Secondary BSC devices local port is 6.6.6.2.

Figure 34. BRLY Configuration for Router A (Commands entered at Router A)

Config>protocol brly BSC Relay protocol user configuration BRLY config>add group (1) Local group number: [1]? Point to Point connection?(Yes or [No]): BRLY config>add local Local group number: [1]? Interface number: [0]? 1 (P)rimary or (S)econdary: [S]? p Does this interface communicate with multiple remote groups [N]? y BRLY config>add remote Local group number: [1]? IP address of remote router: [0.0.0.0]? 6.6.6.1 Remote router group number: [1]? (P)rimary or (S)econdary: [S]? s Station address in hexadecimal (1 - FF): [1]? c1 BRLY config>li all BSC Relay Configuration Local Group Port Net Remote Station IP Group Type Status Number Group Address Address ------ ----- ----------------- ------ ------ ------- --------------- 1 (E) MULTI Local PRMRY (E) 1 Remote SCNDRY (E) 1 C1 6.6.6.1 E = enabled, D = disabled BRLY config>add group (2) Local group number: [1]? 2 Point to Point connection?(Yes or [No]): BRLY config>add local Local group number: [1]? 2 Interface number: [0]? 1 (P)rimary or (S)econdary: [S]? p Does this interface communicate with multiple remote groups [N]? y BRLY config>add remote Local group number: [1]? 2 IP address of remote router: [0.0.0.0]? 6.6.6.2 Remote router group number: [1]? 2 (P)rimary or (S)econdary: [S]? s Station address in hexadecimal (1 - FF): [1]? c5 BRLY config>li all BSC Relay Configuration Local Group Port Net Remote Station IP Group Type Status Number Group Address Address ------ ----- ----------------- ------ ------ ------- --------------- 1 (E) MULTI Local PRMRY (E) 1 Remote SCNDRY (E) 1 C1 6.6.6.1 2 (E) MULTI Local PRMRY (E) 1 Remote SCNDRY (E) 2 C5 6.6.6.2 E = enabled, D = disabled

Notes:

The configuration for group 1 starts at (1).
The configuration for group 2 starts at (2).

Figure 35. BRLY Configuration for Router B (Commands entered at Router B)

BRLY config>add group Local group number: [1]? Point to Point connection?(Yes or [No]): BRLY config>add local Local group number: [1]? Interface number: [0]? 1 (P)rimary or (S)econdary: [S]? s Station address in hexadecimal (1 - FF): [1]? c1 BRLY config>add remote Local group number: [1]? IP address of remote router: [0.0.0.0]? 6.6.6.4 Remote router group number: [1]? (P)rimary or (S)econdary: [S]? p BRLY config>li all BSC Relay Configuration Local Group Port Net Remote Station IP Group Type Status Number Group Address Address ------ ----- ----------------- ------ ------ ------- --------------- 1 (E) MULTI Local SCNDRY (E) 1 C1 Remote PRMRY (E) 1 6.6.6.4 E = enabled, D = disabled

Figure 36. BRLY Configuration for Router C (Commands entered at Router C)

BRLY config>add group Local group number: [1]? 2 Point to Point connection?(Yes or [No]): BRLY config>add local Local group number: [1]? 2 Interface number: [0]? 1 (P)rimary or (S)econdary: [S]? s Station address in hexadecimal (1 - FF): [1]? c5 BRLY config>add remote Local group number: [1]? 2 IP address of remote router: [0.0.0.0]? 6.6.6.4 Remote router group number: [1]? 2 (P)rimary or (S)econdary: [S]? p BRLY config>li all BSC Relay Configuration Local Group Port Net Remote Station IP Group Type Status Number Group Address Address ------ ----- ----------------- ------ ------ ------- --------------- 2 (E) MULTI Local SCNDRY (E) 1 C5 Remote PRMRY (E) 2 6.6.6.4 E = enabled, D = disabled

BRLY Considerations

When configuring BRLY, keep the following in mind:

Enabling BRLY will result in an increase of polling in the network which will reduce the total network throughput.
BSC devices automatically disconnect if their inactivity timer expires. By default, this occurs after three seconds. An extremely busy network could result in BSC devices that disconnect frequently.

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