Hello folks,
i inherited a huge network combined from Cisco and Mikrotik devices. I cannot find reason, why i am getting unwanted traffic into devices /once-in-time/, which traffic doesn’t belong to. It causes lags in large scale.
Core network is made o Cisco 3XXX and 29XX. VTP is used to distribute VLANs in core. Some Mikrotiks are used, but we want to have it only as transparent VLAN switch with management in separated VLAN.
Problem identification: i use RB2011 as simple media convertor /sfp and eth5 is bridged + vlanXY with IP address is used as mngmt/. Once in time, i am getting undesirable traffic passing tru this Mikrotik causing lags in network and even crash with huge packet loss. This traffic is from other part of network and doesn’t have destination behind RB2011
I suspect:
- vlan loop
- poorly configured mikrotiks, where only 2 interfaces are bridged to pass all VLANs. No other features are used.
- host MAC table on Mikrotik is full /contains more than 300 entries/
- RSTP ? would MSTP help?
Sorry for poor explanation, but i am tired of this problem 
How can i diagnose problem? Any help would be appreciated