Juniper PTX5000, Руководство по оборудованию

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Table 1: PTX5000 Hardware Components
(Continued)
Component Model Number Hardware Label CLI Output Description
RE-BLANK – – – –
Switch Interface
Board (SIB) SIB-I-PTX5008 SIB-I-PTX5008 SIB-I-8S "PTX5000 Switch
Interface Board
Description" on page
140
SIB2-I-PTX5K SIB2-I-PTX5K SIB2-I-PTX5K
SIB3-PTX5K SIB3-I-PTX5K SIB-I
Front Door PTX5000-
DOOR-S – – –
PTX5000 Component Redundancy
The PTX5000 is designed so that no single point of failure can cause the entire system to fail. The
following major hardware components are redundant:
• Switch Interface Boards (SIBs)—The PTX5000 has nine SIBs. All nine SIBs are active and can sustain
full throughput rate. The fabric plane can tolerate one SIB failure without any loss of performance.
See
"PTX5000 Switch Interface Board Description" on page 140 .
• Host subsystem—The host subsystem consists of a Routing Engine functioning together with a
Control Board. To operate, each host subsystem requires a Routing Engine installed in a slot in the
Control Board. The PTX5000 can have one or two host subsystems. If two host subsystems are
installed, one functions as the primary and the other functions as the backup. If the primary host
subsystem (or either of its components) fails, the backup can take over as the primary. See
"PTX5000
Host Subsystem Description" on page 116 .
If the Routing Engines are configured for nonstop active routing, the backup Routing Engine
automatically synchronizes its configuration and state with the primary Routing Engine. Any update
to the primary Routing Engine state is replicated on the backup Routing Engine. If the backup
Routing Engine assumes the primary role, packet forwarding continues through the PTX5000
without interruption. For more information about nonstop active routing, see
Nonstop Active
Routing Concepts
and
Nonstop Active Routing System Requirements
.
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