Cisco 7246 - uBR Router Kullanıcı Kılavuzu - Sayfa 4
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• Cisco uBR7200-I/O-FE
• Cisco uBR7200-I/O-2FE/E
Although all of the above I/O controllers are supported on the Cisco uBR7246VXR with a Cisco uBR7200-NPE-G1, they are optional. If
they are present, the Cisco I/O controller functions for console and auxiliary ports will be active and the corresponding connections on the
Cisco uBR7200-NPE-G1 will be deactivated. If a Cisco I/O controller is not present, all connections are active on the Cisco
uBR7200-NPE-G1. The PCMCIA slots and any LAN/WAN interfaces present on a Cisco I/O controller will always be available in addition
to the Compact Flash slot on the Cisco uBR7200-NPE-G1.
It is important to remember that the Cisco I/O controller is entirely optional in a Cisco uBR7200-NPE-G1 enabled system. Customers
upgrading to a new Cisco uBR7200-NPE-G1 in an existing chassis will have the option of retaining the functionality of their existing Cisco
I/O controller, while new chassis purchases will be available without a Cisco I/O controller to reduce cost or with a Cisco I/O controller at
the customer's discretion. If a system is purchased without a Cisco I/O controller, it will be shipped with a blank I/O controller slot cover.
The Cisco uBR7200-NPE-G1 will still occupy the NPE slot on the rear of the chassis with all of its connections being on the rear (the same
side as the power supplies).
Q. Do I need a Cisco I/O controller when using a Cisco uBR7246VXR with a Cisco uBR7200-NPE-G1?
A. No; an I/O controller is optional.
Q. What IOS Software versions support the Cisco uBR7200-NPE-G1?
A. The Cisco uBR7200-NPE-G1 will be supported at release in Cisco IOS Software Release 12.2(11)CX.
Q. What are the memory options for the Cisco uBR7200-NPE-G1?
A. The Cisco uBR7200-NPE-G1 ships with a default of 256 MB of system SDRAM. This can be expanded to either 512 MB or 1 GB.
Memory upgrades can be configured to ship on a new Cisco uBR7200-NPE-G1 or they can be ordered as a field-upgradeable spare.
Q. What type of memory does the Cisco uBR7200-NPE-G1 use?
A. The Cisco uBR7200-NPE-G1 introduces the use of double data rate memory to the Cisco uBR7246VXR. DDR memory devices can
typically transfer information at twice the rate of conventional DRAM memory modules. That is because DDR memory can transfer data at
both the leading and trailing edge of the system clock cycle, while conventional memory only functions at one edge of the clock signal.
The DDR memory used in the Cisco uBR7200-NPE-G1 also includes Error Correcting Code (ECC) support. ECC memory increases the
robustness of memory devices by including an extra bit for every byte of memory. This extra bit can be used to detect and possibly correct
errors that can occur in the memory device. These errors can be caused by such external factors as external radiation causing a bit in memory
to become unstable and report an incorrect value (a 0 becomes a 1 for example). ECC memory can detect these bit flips and report them to
the system. If only a single bit is affected, ECC can correct these errors on the fly and report that a correction has occurred. If multiple bits
are affected in the same byte of memory, ECC memory can report these errors, but cannot correct them.
Q. How much Boot flash is available on the Cisco uBR7200-NPE-G1?
A. The Cisco uBR7200-NPE-G1 includes 16 megabytes of on-board Boot flash media. This increase in available internal media means that
Boot flash can now hold a functional system image instead of just a Boot image. However, we recommend against this because this does not
leave enough space for crashinfo files. External flash media such as PCMCIA or compact flash cards can hold multiple Cisco IOS images and
any image can still be booted through the use of the Boot system command.
As with other Network Processing Engines, boot flash is not upgradeable. The Cisco IOS Boothelper image is
ubr7200-kboot-mz.122-xx.CX.bin (where xx = Cisco IOS Release 12.2CX). This should be installed on the bootflash: device. The complete
Cisco IOS Software image should be installed on the compact flash device, disk2:
Q. What are I/O Boothelper image differences between the Cisco uBR7200-NPE-G1 and its predecessor NPEs?
A. Here are the summary of differences between the I/O Boothelper image for the Cisco uBR7200-NPE-G1 and its predecessor NPEs:
a) I/O Boothelper image for the Cisco uBR7200-NPE-G1:
– ubr7200-kboot-mz.122-xx.CX.bin (where xx = Cisco IOS Release 12.2CX)
– Mandatory Boot image for the Cisco uBR7200-NPE-G1
– Loads on-board Cisco uBR7200-NPE-G1 Flash
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