If it is a live site then you need to proceed with caution. But certainly the 2 platforms are compatible to run HSRP and the 2 versions of code should be compatible. So there should not be any real issue in setting up HSRP there.
In my experience of setting up HSRP on existing networks/subnets, there is an advantage if you take the existing router interface address (which is the configured default gateway on the end stations in the subnet) and use that for the virtual/shared address and configure a new address on the router interface it makes the transition to HSRP easier since you do not need to change configuration on the end stations.
Both of the points that Milan makes are valid and are something to think about.
In my opinion when you compare the impact of possibly confusing the ARP table on some end stations for a couple of hours (maybe) vs the impact of leaving the original address on the router interface, configuring HSRP with another address, and having to manually reconfigure the default gateway of all devices on that subnet, I know which one I prefer. Of course it is your network and you should choose the one that seems least impact to you. (it has been a long time since I looked and I do not remember whether IOS does a gratious ARP when it starts HSRP, but if it does then the issue of end station ARP table is taken care of)
The advice about scheduling a reload before starting remote maintenance is a good suggestion. If something goes wrong with your config changes it will restore the router to the config before changes were made. And if your changes are successful then you just cancel the reload.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.