Hi guys There is a Old Cisco Catalyst Data Center designed very bad. There are four 6500 that form a square with several 3560 linked to them. There is also attached a couple of Nexus 7k (new DC) and a juniper VC to aggregate firewall and F5.
6500-1 is the root bridge for all vlans.
Some of these vlans are trunked to the Nexus and to the juniper.
Problem: We have a lot of Mac Flap on Catalyst vlans, when flaps occur nexus and juniper are affected (mac move are present in logs) and we can see disconnections and issue everywhere.
Could be a L2 loops but we cant find the root cause, Mac that are Flapping are from different vlans and dislocated on different switch.
I read about L2 autonegotation protocols like DTP could be the cause. Catalyst have autonegotation, nexus and juniper no.
I red here about this ( https://serverfault.com/questions/790841/how-to-troubleshoot-a-mac-flapping-between-switch-ports-cisco )
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