Module 4 Notes

Legacy Inter VLAN Routing
	-Uses Physical interfaces
	-Significantly limited due to limited number of physical interfaces
	-Simplest
	-No longer implemented in switched networks
	-Uses Switchport

Router on a Stick
	-Looks the same as legacy but only uses one cable and switchport
	-Only requires one interface
	-Requires most configuration, more commands
	-too many communication between VLANS can cause issues with limited bandwidth

	-requires you to create a subinterface for each vlan to be routed
		requires two commands
			-encapsulation dot1q (vlan_id) [native]
			-ip address (ip-address) (subnet-mask)

	-no shut required for phsycial interface afterwards to enable physical interface

Layer 3 Switch
	-Most expensive
	-Cleanest topology, better performance
	-Has Layer 2 EtherChannels that can be used as trunk links to increase bandwidth
	-Latency is much lower cause data doesn't need to leave switch to be routed to different network
	-most commonly deployed in large scale LANs (i.e campus LANs)
	-Route from one VLAN to another using multiple switched virtual interfaces
	-Can convert a layer 2 switchport to a layer 3 interface

	-VLANs that are to be reachable by other layer 3 devices must be advertised using static or dynamic routing
	-no switchport command on a layer 2 port converts it into a layer 3 interface
	-interface gets configured with an IPv4 configuratiom

	Configuration on a Layer 3 Switch:
		-no switchport command on a layer 2 port converts it into a layer 3 interface
		-ip routing global configuration command
		-configure routing

-show ip interface brief command verifies subinterface status
-show interface verifies which VLANs each subinterface is on