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You’re getting MAC flaps because the ECY-300 isn’t forwarding any BPDUs, so RPVST+ can’t detect the loop and both ports stay forwarding.Cisco covers this exact behavior here: https://community.cisco.com/t5/networking-knowledge-base/importance-of-bpdu...
You need to enable ip routing on the L3 switch for the SVIs to actually route traffic between VLANs.Seehttps://www.ciscopress.com/articles/article.asp?p=3089357&seqNum=6 https://pingmynetwork.com/network/ccna-200-301/intervlan-routing
The routing logic is fine, but dropped packets usually come from inconsistent tagging or a mismatch on the uplink trunk between the switch and the gateway. Before touching SFPs, verify that both sides carry the exact same VLANs as tagged and that the...
Agree with @enes, setup looks clean.Default route for VLANs 2–7 and PBR for VLAN 8 is exactly how I’d handle dual ISPs here.Keeping inter-VLAN traffic local on the SG350XG makes total sense with 10 G links.
The delay is normal for IE 9320 stacks in install mode. Each switch reloads its software and re-syncs with the active unit. Just ensure all members run the same IOS-XE version and that stack links stay stable during boot. Some delay is expected due t...
