- May I encounter routing issues with some clients ?
- Is it recommended to deploy ampr-ripd in parallel with BGP ?
You won't encounter problems with traffic to other systems on internet and also not with other AMPRnet systems routed via BGP, but some of the traditional AMPRnet networks that are only routed via IPIP will be unreachable when you do not run IPIP tunnels in parallel to your BGP announcement, or at best they will be routed via San Diego, USA which of course affects delay and packet loss values.
I cannot judge if this will affect your system. However, when your router system is capable of running ampr-ripd or another solution for IPIP tunnels (e.g. the scripts for RouterOS or the recent solution for Juniper) I think it is always a good idea to install one of them.
Rob