![]() The DHCP Clients are ok with any snooping configuration but again the SVI’s on the switch do not get any IP addr assigned if Snooping is on. becaus the router has on another interface/subnet a DHCP server.Įverithing works fine beside the SVI they dont get any IP addr from the DHCP server if the IP DHCP Snooping is on. This is my DHCP lab (with Server, Relay and Clients) where I face an issue:ġ – I set dhcp snooping on a switch that sits on the access side the sw connects DhcpClients on two Vlans Ģ – the switch has two SVI’s (for each VLAN) and ip addresses through DHCP.ģ – the switch has also a trunk interface towards a router (ROAS topology basically)Ĥ – on the router are two sub-interfaces with static ip AND for each vlan with #ip helper-address.ĥ –. I have a question abou DHCP Snooping configuration.įirst my question is if you can use SVIs, with dynamic ip allocation, on a switch with DHCP Snooping active (I presume you should in order to manage the sw)? So it makes sense to learn about DAI and DHCP Snooping at the same time. Packet Tracer Labs is an online tool where you can practice the essential elements of networking in order to clear the most sought after examinations. DAI uses two types of lists: one statically configured with an ARP ACL, and the other dynamically learned with the DHCP Snooping feature. DT4 SRv6 functions at the PE node ( draft Cisco Packet Tracer Labs CCNA. DAI uses a table that lists the legitimate IP address/MAC address pairs, filtering ARP messages that do not conform to that list. 0 (200-201) Exam Description:The Understanding Cisco Cybersecurity Operations. DAI causes the switch to examine the detail of ARP messages that it forwards. ![]() The switch would normally forward those Ethernet frames that happened to encapsulate an ARP message, ignoring the ARP details. Those choices include filtering DHCP messages that appear to be part of a DHCP-based attack.Ī switch configured to use DAI follows a similar process with ARP messages sent by attached devices. DHCP Snooping causes the switch to examine the DHCP details, collect data, and make choices. Normally, a switch would forward DHCP messages sent by the attached devices, ignoring the fact that some Ethernet frame happened to encapsulate a DHCP message. Both features help secure a network by protecting common protocols against attacks meant to take advantage of those protocols.
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