Hi All,  I user my Core Switch(Cisco 3750) do DHCP server to Vlans. but Switch display messege : 01:07:32.110: %IP-3-LOOPPAK: Looping packet detected and dropped -src=192.168.10.41, dst=192.168.10.254, hl=20, tl=78, prot=17, sport=137, dport=137in=Vl...

I have System Camera with Cameras use DSCP code 34 ( Cameras in Vlan )  This is DiagramPls guide me config DSCP in this Case Thansk !

Dear all,     I have 2 module :Cisco 1000Base- LX/LH SFP . Sw 3560E ( Top-Wig ) Sw 4510R . I want to connect 3560E to 4510R by fiber optical (Singer mode -distance 3km ) use module :Cisco 1000Base- LX/LH SFP.      But when plug module to Sw 3560E (To...