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6-2
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 6 Software Upgrade
Upgrading the Cisco IOS image
Step 2 Identify the file system to copy the image.
The file system type ‘flash’ or ‘disk’ is used to store the Cisco IOS image. The show file system
command lists the file systems available on the router. The file system should have sufficient space to
store the Cisco IOS image. You can use the show file system or the dir file_system command in order
to find the free space.
Router# show file system
File Systems:
Size(b) Free(b) Type Flags Prefixes
262144 240157 nvram rw nvram:
- - opaque rw system:
- - opaque rw tmpsys:
- - opaque rw null:
- - opaque ro tar:
- - network rw tftp:
- - opaque wo syslog:
* 100401148 39104096 flash rw flash:
67108860 67108860 flash rw ramdisk:
- - network rw rcp:
- - network rw ftp:
- - network rw http:
- - network rw scp:
- - opaque ro cns:
Step 3 Prepare for the upgrade.
You should consider these items before you upgrade the Cisco IOS:
• Store both the old Cisco IOS and the new Cisco IOS, if the router has sufficient memory. You can
boot the router in the ROMMON mode and boot the old Cisco IOS, in case of boot failure with new
Cisco IOS. This method saves time if you want to roll back the Cisco IOS.
• Backup the configuration from the router because some of the Cisco IOS releases add default
configurations. This newly added configuration may conflict with your current configuration.
Compare the configuration of the router after the Cisco IOS upgrade with the configuration backed
up before the upgrade. If there are differences in the configuration, you must ensure they do not
affect your requirements.
Step 4 Verify that the TFTP server has IP connectivity to the router.
The TFTP server must have a network connection to the router and must be able to ping the IP address
of the router targeted for a TFTP software upgrade. In order to achieve this connection, the router
interface and the TFTP server must have an IP address in the same range or a default gateway configured.
Check the IP address of the TFTP server in order to verify this configuration.
Step 5 Copy the IOS Image from the TFTP server.
Before you copy the image, ensure that you have started the TFTP server software on your PC, and that
you have the file name mentioned in the TFTP server root directory. Cisco recommends that you keep a
backup of the router and access server configuration before you upgrade. The upgrade does not affect
the configuration, which is stored in nonvolatile RAM [NVRAM]. However, this situation might happen
if the right steps are not followed properly.
Router# copy tftp: flash:
Address or name of remote host []? 10.105.33.135
Source filename []? asr901-universalk9-mz.151-2.SNG
Destination filename [asr901-universalk9-mz.151-2.SNG]?
Accessing tftp://10.105.33.135/asr901-universalk9-mz.151-2.SNG...
Erase flash: before copying? [confirm]n
Loading asr901-universalk9-mz.151-2.SNG from 10.105.33.135 (via FastEthernet0/0):
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 30551884 bytes]