I have a core stack of ms425 switches connected to a Palo Alto firewall via aggregate link. We are replacing the older firewalls with newer models but when the uplink is connected to the new devices the OSPF routing is not established, therefore, no traffic is getting out of the internal network. The configs between the old and new firewall are exactly the same. We have tried changing the uplink to a standard ethernet as well as rebooting the core stack when connected.    Has anyone else run into this issue? Any advice or guidance is greatly appreciated.  ... View more