Hy all,
Beginning this week I have an odd situation over the network which could not replicate or find a solution yet.
I have a mix setup of L3 switches formed by a stack of Cisco WS-C3650-24TS which communicate with a stack of L3 Dell N4032F. Communication between these two vendors is by a port channel which contain two 1Gb interfaces, both set in trunk mode.
Cisco SW act as a border SW for my clients network and Dell SW act as a border for Virtualized Server Network infrastructure.
Cisco SW are set as GW for all clients and servers VLANs and everything was ok until this week when suddenly same VLAN communication stopped between clients behind Cisco SW trying to reach servers behind Dell SW. Also this communication issue only occurs one way, from Cisco to Dell, on the servers behind Dell SW I have no problem reaching the same VLAN on clients behind Cisco SW.
Until now, the only fix I found is a restart of Cisco Stack after which everything comes back to normal until it crashes again – this happens three times now.
To troubleshoot, I tried to list the arp and mac table on both Cisco and Dell SW, but nothing seems to be wrong here. All the ip and mac addresses are listed, have the right VLAN and interface.
Also the logs on both SW doesn’t show nothing suspicions.
Due to the fact that same Vlan communications does not require routing, can someone advise what step to troubleshoot to take or where else can I look to try to figure this out.
Thank you!
