Sorry for the late reply, Michael. If your P2P links are meant to run as pure Layer 3, the problem is that Meraki still treats them as switchports. Since they stay in Layer 2, RSTP will naturally block one side of the triangle. On Catalyst, no switchport fixes this, but Meraki doesn’t support routed ports yet. f the P2P VLAN is fully isolated and only used between cores, disabling RSTP on both ends is usually safe. The only real risk is if that VLAN is ever extended somewhere it shouldn’t be. ... View more

Hi Michael, The issue isn’t really OSPF but the fact that the inter-DC links are still running at Layer 2. With RSTP enabled, one leg will always be blocked to prevent a loop, which is why the DC2–DC3 link stays unused. Disabling RSTP removes that limitation but also removes loop protection. If you need to stay in Layer 2, it’s better to keep RSTP and enable BPDU Guard or Root Guard on those uplinks. Loop Guard adds a safety layer if a blocked port stops receiving BPDUs and accidentally transitions to forwarding. In the long run, using routed ports (no switchport) is cleaner since OSPF handles convergence and STP won’t interfere. Docs worth checking: https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol-stp-8021d/218321-configure-stp-with-loop-guard-and-bpdu-s.html https://pingmynetwork.com/network/ccna-200-301/loop-guard ... View more

Sounds like a physical issue. Since you already changed the cable and tested on other switches, it could be a bad QSFP port or a loose connection. Try cleaning and reseating both ends. If it keeps happening after upgrading and rebooting, open a case for RMA. ... View more

Haven’t seen anything official yet, hopefully it’s something they add in the future ... View more

HI, also watch DHCP and ARP behavior too, especially if both AP types share the same VLAN. Seen a few cases where Catalyst kept old ARP entries after roaming, causing short drops before the refresh. ... View more

Seen this happen a few times on CS firmware as well. The switch keeps forwarding traffic but the management plane just stops replying, looks like the container crash Mloraditch mentioned. I’ve also seen it come back online after a reboot for a few days before it dies again, no clear pattern either. If you can grab logs right before the reboot you might catch the process restart event Switching to native IOS XE seems to be the only reliable fix so far, haven’t seen the issue again after that. ... View more