Saturday, September 20, 2025

Cisco ISR 4431 firmware upgrade from 17.03.04a to 17.09.07a

You can upgrade from 17.03.04a to 17.09.07a directly

The upgrade will take about 30 mins.

#1 Copy the image to the router and backup the config

#####USB#####
copy usb0:isr4400-universalk9.17.09.07a.SPA.bin bootflash:
copy system:running-config usb0:

####TFTP####
copy tftp:<ip>/isr4400-universalk9.17.09.07a.SPA.bin bootflash:
copy system:running-config tftp:<ip>

####FTP####

copy ftp://<username>:<password>@<location/directory> bootflash:
copy system:running-config ftp://<username>:<password>@<location/directory>

#Example
copy ftp://admin:123456@10.10.10.1/root bootflash:isr4400-universalk9.17.09.07a.SPA.bin

#2 Verify IOS checksum

FileName :  isr4400-universalk9.17.09.07a.SPA.bin
MD5 Checksum :    528c1c9424508bb5748217191a51012c

verify /md5 bootflash:isr4400-universalk9.17.09.07a.SPA.bin

#3 Verify the status of router

ter len 0
Sh clock
Show ip int brief
Show int des
Show ip ospf nei
Show ip arp
Show ver
Show cdp nei
Show run
show ip ospf neighbor
show crypto isa sa
show crypto sess brief
Sh ip route sum
Sh int trunk
Sh interface
Sh proc cpu his
sh inv
Sh environment all
sh license usage
sh license summary
sh license all
sh platform
sh platform hardware throughput crypto
sh platform hardware throughput level
Sh inter transceiver
Sh mac-add
Sh stand b
ter len 24
wr mem

#4a Upgrade the router

config t
no boot system
boot system flash bootflash:isr4400-universalk9.17.09.07a.SPA.bin
end
wr mem

#4b Verify the next bootfile of router

show boot

#Ensure it show your target IOS
#BOOT variable = bootflash:/<image.bin>,12;

reload
y

#4c *After reload* Verify the Version of router

show version

#5 Delete the old image

delete bootflash:<image.bin>

#6 Compare the configuration before and after upgrade software and verify the status of router

ter len 0
Sh clock
Show ip int brief
Show int des
Show ip ospf nei
Show ip arp
Show ver
Show cdp nei
Show run
show ip ospf neighbor
show crypto isa sa
show crypto sess brief
Sh ip route sum
Sh int trunk
Sh interface
Sh proc cpu his
sh inv
Sh environment all
sh license usage
sh license summary
sh license all
sh platform
sh platform hardware throughput crypto
sh platform hardware throughput level
Sh inter transceiver
Sh mac-add
Sh stand b
ter len 24
wr mem

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