Does DHCP Snooping how any syslog warnings regarding a positive snooping action ?
And, look at this:
If the relay agent inserts option 82 but does not set the giaddr field in the DHCP packet, the DHCP server interface must be configured as a trusted interface by using the ip dhcp relay information trusted global configuration command. This configuration prevents the server from dropping the DHCP message.
Enabling the DHCP-Snooping Host-Tracking Information Option
If you enable the host-tracking information option, the DHCP relay agent information option (option 82) is added to the client packets that are being forwarded. The relay agent option contains the agent circuit ID and the agent remote ID information. The circuit ID suboption contains the port and the VLAN number of the client. The remote ID suboption contains the MAC address of the switch. Before inserting the host-tracking information, the switch verifies that the DHCP messages do not have an existing relay information option or a nonzero giaddr field. Before removing the host-tracking information, the switch verifies that the DHCP reply messages are from a trusted port and that the MAC address of the remote ID and the local switch match. If the packet comes from a trusted port and the addresses do not match, the packet is forwarded.
To configure the host-tracking information option for DHCP snooping, perform this task:
Enable the DHCP-snooping host-tracking information option.
set dhcp-snooping information host-tracking enable
Display the MAC address for the host-tracking information option.
show dhcp-snooping config
This example shows how to configure the DHCP-snooping host-tracking information option:
Console> (enable) set dhcp-snooping information host-tracking enable
DHCP Snooping Information Option Enabled.
Console> (enable) show dhcp-snooping config
DHCP Snooping MAC address matching is enabled.
DHCP Snooping host-tracking information option is disabled.
Remote ID used in information option is 00-d0-00-4c-1b-ff.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.