Cisco 10008 - Manual (Page 18)

18
Cisco 10008 Router Performance Routing Engine 3 Installation
OL-8544-01
Upgrading Software
Upgrading Software
This section describes the following methods for upgrading Cisco IOS images on the Cisco 10008
router:
• Upgrading Software from a PRE2 to a PRE3, page 18
• Upgrading Software on a Single PRE3, page 21
• Upgrading Software on Redundant PRE3s, page 22
Upgrading Software from a PRE2 to a PRE3
This section describes the procedures for upgrading the Performance Routing Engine from a PRE2 to a
PRE3. Procedures for downgrading from a PRE3 to a PRE2 are also described.
• Prerequisites, page 19
• Upgrade Considerations, page 19
• Procedure to Upgrade a PRE2 to a PRE3, page 19
Note When upgrading from a PRE2, all references to boot commands pointing to disk1 should be removed.
PRE3 has one slot, Disk0.
Table 5 Definition of Bits in the Software Configuration Register
Bit No. Hex Value Meaning/Function
00 to 03 0x0000 to 0x000F Defines the source of a default Cisco IOS software image required to run the router:
• 00—At power-on, the system remains at the ROM monitor prompt ( rommon>),
awaiting a user command to boot the system manually by means of the ROMmon
boot command.
• 01—At power-on, the system automatically boots the first system image found on
the PRE3.
• 02 to 0F—At power-on, the system automatically boots from a default Cisco IOS
software image stored on a TFTP server in the network. For this setting, the
Fast Ethernet port on the PRE3 must be configured and operational. This setting
also enables boot system commands that override the default filename.
06 0x0040 Causes system software to ignore the contents of NVRAM.
07 0x0080 Enables the original equipment manufacturer (OEM) bit.
08 0x0100 The Break function is disabled after 30 seconds.
09 0x0200 Not used.
10 0x0400 Broadcast based on 0.0.0.0 IP address.
11 and 12 0x0800 to 0x1000 Defines the console baud rate (the default setting is 9600 baud).
13 0x2000 Boots an image from Disk0.
14 0x4000 Broadcast using the subnet broadcast address.
15 0x8000 Enables diagnostic messages and ignores the contents of NVRAM.