link aggregation - LACP issue and looping issue

Question

Hiwe recently bought Procurve 1800 switch to be backup/failover switch to Dell Powerconnect 6224. According to our plan these two switches will provide us failover capability to our ISCSI network which include Virtual servers, SQL database and exchange database.   Now we have setup these switches with few vlans and created link aggregation for HP port 1-3 (trunk 1) and Dell Port2-4 (trunk 1). when we connect both cables (trunk 1) and connect one test pc on one of the port (vlan 1000) and try pinging server on dell switch (Vlan 1000)we get timeout but if we unplug one of the cable of trunk 1 and ping it works and it works for that particular server there after it works even we connect both cable and all fail over scenarios. We have to do same for all the servers those are exist on dell switch.some time we also get lot of flash light in both dell and procourve 1800 switch if we connect management port to our main switch (procourve 5308) we just have to disconnect before it goes crazy.we also tried same thing with LACP and same problem.we are trying to figure out why this is happening for weeks now and have no idea. your suggestion will be greatly appreciated. we posted same message to hp's forum as well but looks like not having any luck   thank you

sentinel-master · Answer

Sounds like you do have a loop - please check and ensure that Spanning Tree or if ideally Rapid Spannign Tree (RSPT) is enabled on both the switches.

The high amount and traffic and light acitvity is due to packets looping around and around and around..........

Spanning tree will stop this and allow correct forwarding through LACP bundle.

Networking General

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