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6-4
Network Processing Engine and Network Services Engine Installation and Configuration
OL-4448-12
Chapter 6 NPE-G2 Overview
NPE-G2 Description and Overview
• Cache memory
The NPE-G2 has two levels of cache: primary and secondary cache that are internal to the
microprocessor with secondary unified cache for data and instruction.
• The NPE-G2 uses DDR SDRAM for providing code, data, and packet storage.
• Two environmental sensors for monitoring the cooling air as it enters and leaves the chassis.
• Full-feature I/O controller functionality
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Three Gigabit Ethernet interfaces (six ports: three SFP [optical] and three RJ-45s [copper]).
Any three ports are available at the same time and are linked directly to the processor; therefore
the interfaces are not charged bandwidth points.
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CompactFlash Disk for storing the default Cisco IOS software image. The CompactFlash Disk
slot can be used whether or not an I/O controller is in the router.
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Auxiliary port with full data terminal equipment (DTE) functionality. (Functional when an I/O
controller is not present. If an I/O controller is present, its auxiliary port is the default port.)
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Console port with full data communications equipment (DCE) functionality. (Functional when
an I/O controller is not present. If an I/O controller is present, its console port is the default
port.)
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Dedicated 10/100 Fast Ethernet Management port—Not to be used for any other purpose.
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Two USB ports for data storage using Cisco USB flash memory modules or security eToken for
VPN applications.
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Boot ROM for storing the ROMmon images.
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Internal flash memory for storing the boot helper (boot loader) image and the Cisco IOS image.
(The boot helper image comes installed on the NPE-G2.) If an I/O controller is present, its
internal flash memory is no longer available.
–
NVRAM for storing the system configuration and environmental monitoring logs. NVRAM
uses lithium batteries to maintain its contents when disconnected from power. If an I/O
controller is present, its NVRAM memory is no longer available.
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Upgradable memory module
Note An I/O controller can be used with the NPE-G2, but an I/O controller is not necessary for
system functionality. Installing an I/O controller in a chassis with the NPE-G2 activates the
console and auxiliary ports on the I/O controller and automatically disables the console and
auxiliary ports on the NPE-G2. However, you can still use the Compact Flash Disk slots and
Ethernet ports on both the NPE-G2 and I/O controller when both cards are installed.
Interfaces
The three interfaces on the NPE-G2 consist of three small form-factor (SFP) Gigabit Ethernet ports and
three 10/100/1000 Fast Ethernet/Gigabit Ethernet ports. The rules for using these ports are:
• Only one port per interface can be used at any one time. For example, for interface
Gigabit
Ethernet 0/1, either the RJ-45 port can be used or the SFP port, but not both.
• A total of three ports on any of the three interfaces (0/1, 0/2, or 0/3) can be used at any one time; for
example, 0/1 SFP, 0/2 SFP, and 0/3 RJ-45.