Choosing A Combination Of Line Modules; Slot Groups; Srp Modules Bandwidth; Line Modules Bandwidth And Switch Usage - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SYSTEM BASICS CONFIGURATION GUIDE 2010-10-04 Configuration Manual

JunosE 11.3.x System Basics Configuration Guide

Choosing a Combination of Line Modules

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Choose a combination of line modules appropriate for the performance. See "Choosing
1.
a Combination of Line Modules" on page 360.
Disable slots that contain unwanted line modules, or modify the combination of line
2.
modules in the router. See "Disabling and Reenabling Line Modules, SRP Modules,
and SFMs" on page 346, and ERX Hardware Guide, Chapter 4, Installing Modules.
Specify the type of performance. See "Specifying the Type of Performance" on page 363.
3.
For line rate performance, the total bandwidth required by the line modules in the slot
group must not exceed the bandwidth available from the SRP module. In this case, the
combination of line modules that can reside in a slot group depends on the following:
The number of slots per group
The bandwidth available from the SRP module
The bandwidth required by each line module
In the case of the SRP-5G+ and SRP-10G modules, the switches (upper and lower)
that the line module can use.

Slot Groups

The number of slots in a group depends on the E Series model. For information about
slot groups, see ERX Hardware Guide, Chapter 4, Installing Modules.

SRP Modules Bandwidth

Different SRP modules offer different bandwidths:
The SRP-10G module provides 2.5 Gbps bandwidth per slot group.
The SRP-5G+ module (ERX705 router only) provides:
2.5 Gbps bandwidth per slot group
5 Gbps bandwidth per router

Line Modules Bandwidth and Switch Usage

The SRP-5G+ and SRP-10G modules comprise two switches; each switch provides 50
percent of the bandwidth.
The line modules in a slot group cannot operate at line rate if:
The sum of their bandwidths exceeds the bandwidth that the SRP module can supply
per slot group.
The sum of the bandwidths they require from one SRP switch exceeds the bandwidth
that the SRP switch can supply per slot group.
Table 40 on page 361 shows the bandwidth that each line module requires for line rate
performance and the switches that the line module can use on the SRP-5G+ and SRP-10G
modules.
Copyright © 2010, Juniper Networks, Inc.