So are both firewalls in use at the moment or is your PBR overriding the default route and sending all traffic to the new firewall ?
If it is then you simply need to replace the existing default route with the new one. If all traffic is using PBR then this should have no effect on the current traffic.
Then once you have the new default route in place you can simply remove the PBR configuration.
Then you can look at changing the subnet mask. Because you are simply increasing the subnet mask and because nothing else is in this vlan it should not affect traffic as long as you don't change the actual IPs assigned to the 6500 SVIs and firewall interface.
So is all traffic using PBR to the new firewall or are you using both firewalls at the moment ?
Well the default was change the was done by a different tech.
Change the default route but add a different route-map in my thinking no issue expect that there was need a nat rule and acl that was need on the firewall for the old networks that did not have route maps to allow traffic for www and https weird.
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