@Sandesh90031 It is more dependent on what type of infrastructure you have. vCD has no limit on firewall rules specific to OnPrem side. It is mostly dependent on NSX-V or NSX-T that vCD is integrated with.
NSX-T 3.x provides 100000 rules as maximums.
If vCD is integrated with AWS, Then 50000 is the limit.
Hope this answers your question.