1720 routers and 12.4.19

tiersten

I ended up with a 32D/8F 1720 from work as they didn't want it any more and were throwing it out. The mini flash cards inside a 1720 router seem to be pretty hard to find. It took me quite a while to find a 16MB one to upgrade my 1720 from 8MB. The RAM however is common and I just used an old 64MB card from my 2610XMs to give me 48MB.

The latest 12.4 (12.4.19) on a 1700 needs 16MB of flash according to Cisco. 12.4.19 IP is actually just under 8MB but it won't fit normally on a 8MB card. If you manually erase the flash but with squeeze support turned off then it will have just enough space to fit 12.4.19. It will ask you whether you want to erase the flash again when you do the copy from TFTP to flash but you must say no as it will default to squeeze support on.

Router#erase /no-squeeze-reserve-space flash:
Erasing the flash filesystem will remove all files! Continue? [confirm]
Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...erased
Erase of flash: complete
Router#copy tftp://192.168.1.50/c1700-y-mz.124-19.bin flash:
Destination filename [c1700-y-mz.124-19.bin]?
Accessing tftp://192.168.1.50/c1700-y-mz.124-19.bin...
Erase flash: before copying? [confirm]n
Loading c1700-y-mz.124-19.bin from 192.168.1.50 (via FastEthernet0): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 8204960 bytes]

Verifying checksum... CCCCCCCCCCCCCCC OK (0x578B)
8204960 bytes copied in 295.192 secs (27795 bytes/sec)
Router#show flash:

System flash directory:
File Length Name/status
1 8204960 c1700-y-mz.124-19.bin
[8205024 bytes used, 183580 available, 8388604 total]
8192K bytes of processor board System flash (Read/Write)

IOS will complain at you on startup that there isn't enough space to store crash info but thats not too important.

% There may not be enough space available to collect the complete crashinfo
% It would be advisable to have 280755 bytes free space on flash:crashinfo

Its a bit of hassle just to get the latest and greatest 12.4 on and you still only get the IP feature set but if you wanted to have a play about its not too bad. You have to drop down to 12.3 or 12.2 to get anything else.

Basically, if your image should just fit and it doesn't let you copy it on then see if it is using a flashfs that reserves squeeze space.