Hi, an option to change source ip address of the update service.

The source address is selected in the usual way, i.e. based on the available addresses and routes.
That is also how you can change it. E.g. put a preferred address in a route table entry that matches this usage.

I'm not quite sure how you expect me to do this if our customer is running bgp in a mpls network?
Can you maybe elaborate a bit more, thanks in advance.

Okay, i looked into it.

I've resolved the issue by changing incoming bgp routes like this.

/routing filter
add chain=ebsa-mpls-in prefix=0.0.0.0/0 set-pref-src=192.168.6.1

Thanks a lot, if anyone got a more preferred resolution please share.

I think it will also work when you set nexthop-choice=force-self in the BGP Peer definition.
At least that is what I routinely do and I notice it always uses the address of the BGP link as source address.
When that is not what you want, well, the way you do it now should work.