Cisco 12012 Technical Information download pdf (Page 9)

Understanding Software Components

Cisco 12000 Series Gigabit Switch Routers 21

Conﬁguration Example

In a typical Internet service provider environment, the Cisco 12000 series routers reside within the

core of the network and can support as many as 44 OC-3/STM-1 IP over SONET/SDH optical links

to Cisco 7500 series routers or aggregation devices. Below is a typical conﬁguration ﬁle for the

Cisco 12012. Important conﬁguration commands are bolded. In this example, a Cisco 12000 series

router called GSR-A connects to the Internet backbone through interface POS11/0, connects to a

second Cisco 12000 series router through interface POS7/0, and connects to Cisco 7500 series

routers through interfaces POS4/0, POS4/1, POS4/2, and POS4/3. In addition, GSR-A also has a

connection to a workstation through interface E0 for TFTP functions only (no routing is performed).

Note In this example, SONET payload scrambling is enabled with the pos scramble-atm

command. SONET payload scrambling applies a self-synchronous scrambler (x^43+1) to the

Synchronous Payload Envelope (SPE) of the interface to ensure sufﬁcient bit transition density. Both

sides of the connection must be conﬁgured using the pos scramble-atm command. Currently, when

connecting to a Cisco 7500 series router and using the pos scramble-atm command, you must

specify the crc 16 command rather than the crc 32 command.

1. You can also get version information from the first LED message.

Line Card Field

Diagnostic Image

Image that runs on the line card when ﬁeld

diagnostics are run with the diag command.

None

GRP ROM Monitor The ROM monitor is responsible for booting the

system from the local Flash devices. It is loaded

into the Flash ROM on the GRP when the board is

manufactured.

show version

Line Card ROM

Monitor

The ROM monitor is responsible for booting the

line card via the MBus. It is loaded into the Flash

ROM on the line card when the board is

manufactured.

execute-on slot slot-number show

version

attach slot-number

show version

exit

ROM Monitor

Library Image

Image that allows the GRP ROM monitor to

access the internal Flash bank and PCMCIA Flash

cards. It is bundled with the GRP Cisco IOS

image so it can be put on the Flash cards when

they are formatted. The GRP ROM monitor gets

the ROM monitor image from the Flash device

before accessing it.

None

Table 1 Software Components in Cisco 12000 Series GSRs (Continued)

Software

Component Description Version Information

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 59 60

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Cisco 12012 Technical Information Page 9

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