Problem: ARP packets passed through L2 VLAN on N3K increase COPP class-map copp-s-arp, in effect there are ARP timeouts on valid VLANs with SVI interfaces, and naturally cause network unreachable.   Same problem is described for N7K in that article: ...

Problem: N3K doesn't pass L2 protocol frames in VLAN marked as remote span (i.e. with dst-mac 01-80-c2-00-00-02).   I've set VLAN for remote span in network. It is also configured on N3K that only passes that VLAN, and it's configured as remote-span....

Network scheme:     Problem: N3K are adding double tag to frames with dst-mac 01:00:0c:cd:cd:d0. If I change MAC to i.e. 01:00:0c:cd:cd:d6 problem doesn't occur. Second tag is with the same VID that first one. On HUAWEI on client port is BPDU tunnel ...