Cisco Catalyst 3750

what is meant by flapping Cisco 2800 router

we have cisco 2800 series router,L3 catalyst 3750 series and watchguard (firewall) and that is connect to L2 switches. But when we connect to router flapping occurs, now we connected to firewall it works fine. please rectify this problem

Configuration between L3 switch 3750 and L2 switch 2960 via trunk port

I am going to connect three L2 switches 2960 from L3 Switch 3750, means all three L2 switches are connected to L3 switch via trunk switch. Thanks & Regards, And i am going to configure VLANs on L3 Switch. So plz let me suggest,if both switches are in server mode then i should configure VLAN on L3...

Cisco Catalyst 3750 routing issues

I need help configuring a simple routing scheme for a 3750, I have a visio diagram of a very simple network, let me know if anybody can help. thanks