Hi,
We have a 2x HPE 5940 acting as our core switch/router. We have some 5130s acting as our access layer switches.
Historically both switches used IPs on the 192.168.0.0/23 subnet as their management IP/VLAN1 VRRP IP.
We want to remove this subnet and replace it with 192.168.16.0/24. On the 5130s we've sucesfully done this, in summary, what we did was, created vlan16, assigned the vlan16 interface an IP address, removed the old static route on the switches of 0.0.0.0 > 192.168.1.253 to 0.0.0.0 > 192.168.16.253 (which is a VRRP on the core) - we then removed the 192.168.1.x IP from VLAN1 on the 5130s and all is good.
We then removed all devices on the network, and finally wanted to remove the VRRP IP on the core switches. One core switch has the IP of 192.168.1.245, the other has 192.168.1.246 and they both share a virtual IP of 192.168.1.253 for VRRP.
So we went onto both core switches and shut down the vlan1 interface on firstly the "secondary" core - everything remained up and working, so we did the same on the "primary" core - and as expected 192.168.1.245 / 192.168.1.253 stopped pinging. But also the new VLAN16 IP's stopped pinging too, in fact we couldnt communicate with anything on the network at all.
I know the above description is fairly vauge, but if anyone has any pointers I could investigate that would be great.
Thanks!