Hi All,
We have a setup of 3650 switches running version 03.06.02aE. There is one core switch and several edge switches connected to the core switch by port-channels. Fairly simple setup.
The core switch does inter-vlan routing. We have 14 L3 vlans.
We have a PABX in vlan 68. A sh ip arp shows that only 5 devices are active in this vlan. The PABX has issues with broadcast traffic. The NIC's of the PABX detect high broadcast volumes on its interface. As a security measure, the PABX resets it's NIC to prevent total failure.
When the PABX resets its NIC, we expierence time-outs on our phones, which seems normal.
When we span the port of the PABX and capture the traffic with wireshark we can see broadcast traffic in vlan 68 generated by devices in a complete different vlan.
The configuration of the vlan 68 interface is very basic. 1 ip address and no ip redirects command.
On the vlan interface configuration of some other vlans there is ip directed-broadcast configured.
This doesn't look like normal behaviour to me. Any ideas how this can happen?
Thanks,
Joris
