In our deployment we have a core switch (BD 8800) connecting to edge switches (x440-24p) through aggregation switches (x460-24x).
All the ports on edge switches are configured for at least two vlans, vlan 10 is voice and an untagged vlan for data or other applications.
Now the problem is I am seeing traffic (at least broadcast) from the untagged vlans appearing in voice vlan.
This is happening all over the network hence putting extra load on all ports and as a result the IP Phones are not able to acquire IP from DHCP server. If i remove the tagged vlan (i.e voice) from a specific port then the leakage from that port into voice vlan stops.
Any idea about solving this issue ?