GitHub user weizhouapache added a comment to the discussion: BGP dynamic 
routing firewall.

> so in my test environment i have 2 region and i try connect network between 2 
> region with dynamic routing but bgp connection can't established because port 
> 179 is not allowed. is it known bug?am i miss something?.

By design in CloudStack, the two VPC Virtual Routers (VRs) connect to the 
upstream router via BGP. The upstream router advertises the networks and routes 
to both VRs, enabling communication between VMs across the VPCs. The VRs 
themselves do not establish a direct BGP session with each other.

Did you use a upstream router as BGP server ? If not, I would suggest to do it

GitHub link: 
https://github.com/apache/cloudstack/discussions/11229#discussioncomment-14613398

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