i need help and suggestions on this issue i am having. As shown on the sketch, i have a single host server connecting to my core setup. This server has two nics with vlan 100 transiting my core with the GW on the Firewall as do all my other vlans on the core. The second vlan (50) which is non-routable does not go through my core infrastructure.
Now i want to take this server down but when the cable with vlan 100 ( which is an access port on the 7K) is removed, the whole network goes down. I see CPU spikes on the FW (Palo Alto). I reached out to Palo alto and was told it was coming from the 7k, but i do not see any spikes on the 7k.
This is scary as a i have other single hosts connected to the 7k that i need to take down.
Any clues as to what i am be experiencing ?
That's extremely odd. If the gateway is on the Firewalls, then removing that server should have 0 effect on other devices unless they are somehow being routed through it.
Can the other hosts reach their default gateway with that server unplugged? Try to verify the routing these devices take place and how they get to their default gateway. If you're allowing ICMP through your network, the traceroute command should be helpful. May also help to gather and compare the data with the server connected and disconnected.