In my network, we have 4507, 4510 & 3750 switches and also cisco IP Phones.
In all the switch ports i have given the command -
switchport voice vlan 10
and data vlan is default vlan 1 (expect trunk port)
So we do connect the ip phones to lan port at the desk and from ip phone pc port to laptops.
More than twice i have seen users without knowing they connect the cable from lan port at the desk to the pc port of the ip phone. This causes loop in the network.
Once loop occured all the switches cpu utilization goes to 100%,as a result i get high ping response
to the switches and causing entire lan down.
Moreover i have not enabled or given the command
spanning-tree portfast -- on any of the switch ports.
Once this happens i have to see which port has gone to blocked port or which port light has become amber and then trace out.
This there any other way to avoid this ??????
This there any such commands which helps me in switches not going to 100% cpu utilization??????
In total is there any solution for this.????