Cisco Performance Routing Engine 5 Panduan Pemasangan Perangkat Keras - Halaman 3
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• Up to 4 GB of eUSB flash memory
The internal embedded USB (eUSB) flash, a mass storage device on the PRE5 and the external USB flash, replace the low
density compact flash card of the PRE4.
These PRE5 USB interfaces are compatible with USB 2.0 specification, and work in the USB-host mode only.
Note
The PRE5 supports only Cisco-certified external USB storage devices.
The Cisco IOS can autodetect the USB disk when it is plugged in. The internal eUSB disk in the PRE5 (the compact flash for
PRE4) is recognized as 'disk0'; the two external USB disks are recognized as 'disk1' and 'disk2'.
• A 10/100/1000 Megabit Ethernet interface that is the management port of the PRE5
• Error-correcting code (ECC) on all DRAM-based memory systems to support high availability
• Online insertion and removal (OIR) support
• PRE5 insertion and pull out sensor support
• Four SFP+ for backhaul and four SFP+ for board-to-board wiring on the front panel
• Enhanced route processor–forward packet engine interface
Redundant PREs
The PRE module supports redundant operation (two PRE modules in a Cisco uBR10012 chassis). If the primary PRE fails, the
secondary PRE automatically takes over operation of the chassis. Because all Cisco uBR10012 line cards are physically connected
to both the primary and secondary PRE modules, a switchover of PRE modules does not require human intervention to reset the line
cards, as they automatically fail over to the redundant PRE. The PRE module is hot-swappable if there is a redundant PRE module
in the chassis.
Note
To achieve high availability or PRE redundancy, you must use the same model of the PREs in the same chassis. If you have
PRE4 modules and you wish to upgrade, you must upgrade both PREs to PRE5.
If there is only one PRE5 installed in the chassis, only four 10G SFP+ interfaces are used; the remaining four 10G SFP+ interfaces
are in down state. However, if both PRE5 engines are installed in the chassis, and the board-to-board wires are connected, all eight
SFP+ backhaul interfaces are enabled.
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