I would start from ugrading to latest 6.xx version then to 7.x.
You should read changelogs to check what had been changed for BGP in 6.xx line since 6.43 up to 6.49
The problem with that is that it is a mkt in production, and if problems or incompatibilities arise when updating, it becomes more difficult to downgrade.
That’s why a new mkt has been bought, to have the most up-to-date
Clone configuration to the new, upgrade it standalone … check what you can check then with 6.49 … cross your fingers … substitute the old one with the new one … watch what is going on … if something would be broken put the old one back … recheck … repeat the procedure
I have read the documentation, and there have been many changes to BGP, so updating will make the system stop working, it will not make the necessary compatibility when going from v6 to v7.
Being an MKT in production, I can’t be testing much.
I’m new with BGP (I did not config the MKT in prod), for that reason I ask for help.