Hello all,
Sometime during the day yesterday our network went down and I attest this to an STP issue. At the time nothing major was happening except for I was rolling out a couple servers from a template (usual stuff) I have since got it back in a state where we can function but one of the 6248's is out of commission so we are not as redundant. If I use port 48 for the lag port connecting to the other 6248, everything goes down (they are both configured for LAG 1 on that port). The same goes for trying to connect the functioning 6248 to the 6224 switch, one connection via LAG 2 working, but If I use a 2nd connection traffic is lost. So as of now it is isolated until I understand the situation. I upgraded the firmware on the 6248 this morning but was hoping for some help since STP is now to me, especially from a troubleshooting perspective.
We have 2 6224 switches running the core redundant iscsi network that are LAG'd to 2 more 6248 switches (LAGS 2 and 3 respectively), and those 6248's where LAG'd into themselves (LAG 1). I had STP enabled for all switches, with the recommended portfast setting on the 6224 ports that were connected to the hosts and shared storage. Everything was working great up until yesterday. I also tried reconfiguring the LAG connections but one switch would work while connectivity to another wouldn't. or would the 2 6248's would see each other but wouldn't traverse LAG2 and 3 to see the iscsi network and servers.
no spanning-tree
spanning-tree mode stp
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