Hello Experts,
I have two Powerconnect 7048P switches in a stack (via stacking modules and cables).
I have two 10GB uplinks (one from each switch) to the firewall (one firewall). The firewall does not support a LAG, so the idea of this is for redundancy, in case one module, SFP, port, or fiber goes bad on one of the two switches.
The interfaces are configured as follows:
interface Te1/1/2
mtu 9216
switchport mode trunk
switchport access vlan 2
switchport trunk native vlan 2
exit
interface Te2/1/2
mtu 9216
switchport mode trunk
switchport access vlan 2
switchport trunk native vlan 2
exit
I was under the impression that spanning tree is enabled globally by default, so since both ports are connected to the firewall, only one port should be forwarding and one blocking without any further configuration. That is not the case though in this scenario, when both interfaces are connected I can no ping the management IP with a steady reply, it appears the two interfaces are rotating up and down, because I will get a ping response a couple of replies, and then will get request time outs for a while, and it is back and fourth. When I disconnect one interface, all is well.
What is the proper way to configure these interfaces so spanning tree will work? If I issue the command show spanning-tree, it does show enabled on all ports. There are also multiple VLANs on these switches, some are connecting iSCSI SAN devices and some are connecting to ESXi hosts. Thanks in advance!
