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CHAPTER 1
ERX System Overview
1-8
SRP Module
The SRP module (see Figure 1-8) is a two-board assembly; both boards
connect to the system’s midplane and to each other:
• The fabric board is a switch fabric server that queues packets for the
line modules. The fabric server houses a flexible hardware queuing
resource that empowers IP QoS for each physical and logical interface,
providing weighted scheduling for preferential packet delivery.
• The system processor board is the dedicated processor that boots the
system, manages diagnostics, and supports routing protocol
processing.
An SRP module must be present for the system to boot. For details about
installing SRP modules, see Chapter 3, Installing ERX Modules. For
specifications of SRP modules, see Appendix B, Module Specifications.
Caution: Do not remove the SRP module while the system is running.
You can install two SRP modules of the same type in the system. If you
do, the first SRP module serves as the primary; the second as a
redundant module, which enhances the system’s reliability. See
Redundancy Features, later in this chapter.
Nonvolatile Storage
The PCMCIA slot on the front of the SRP module holds a Type II
PCMCIA nonvolatile storage (NVS) card. This card retains the system’s
configuration and software. See Figure 1-8. The PCMCIA card is factory
installed.