![]() ![]() ![]() Legitimate DHCP clients and their assigned IP addresses will appear in the DHCP snooping binding table: This informs the switch that DHCP responses are allowed to arrive on those interfaces. However, if the access switch was functioning only at layer two, we would have to designate our uplink interfaces as trusted interfaces by applying the command ip dhcp snooping trust to the layer two interfaces. In this scenario, our multilayer switch is relaying DHCP requests toward a central DHCP server elsewhere on the network, a behavior enabled by adding one or more ip helper-address commands under the access VLAN interface. ![]() Option 82 on untrusted port is not allowedĭHCP snooping trust/rate is configured on the following Interfaces: I've already covered IP source guard (with and without DHCP), so today we'll look at how to implement dynamic ARP inspection.įirst, we need to enable DHCP snooping, both globally and per access VLAN:ĭHCP snooping is configured on following VLANs:ĭHCP snooping is operational on following VLANs:ĭHCP snooping is configured on the following 元 Interfaces: These features help to mitigate IP address spoofing at the layer two access edge. ![]() This information can be handy for general troubleshooting, but it was designed specifically to aid two other features: IP source guard and dynamic ARP inspection. DHCP snooping is a feature which allows a Cisco Catalyst switch to inspect DHCP traffic traversing a layer two segment and track which IP addresses have been assigned to hosts on which switch ports. ![]()
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