Cisco 1841 IP SLA Command

[AvidPontoon1]

We are getting a failover wan in the coming weeks and we have a Cisco 1841 as one of the core routers. I know from training that I need to be able to use the ip SLA commands to monitor ip addresses and when one becomes unreachable to no shut the other wan connection. The only problem is that the router is currently on IP BASE. I have tried to issue the SLA commands but the router won't recognise them.

My question is what version of the Cisco IOS on the 1841 will support the ip SLA commands?

Edit: Another point to mention is that the router currently only has a 32mb flash card in it, please let me know if the new ios will exceed this. 

[Georg Pauwen]

Hello,

you need Advanced Enterprise Services (e.g. c1841-adventerprisek9-mz.151-4.M12a.bin) to support IP SLA. These require at least 64MB Flash.

[Ben Samayoa]

Hi there,
To be covered you need Advance IP Software.
Memory upgrade is necessary to accommodate the new image, pls refer to the below info:
Details
Description : ADVANCED IP SERVICES
Release : 15.1.4M12a
Release Date : 06-Oct-2016
FileName : c1841-advipservicesk9-mz.151-4.M12a.bin
Min Memory : DRAM 192 Flash 64
Size : 43.65 MB ( 45768408 bytes)

Pls rate it if helpful, regards, Ben.