CCNA3-1 Chapter 6 Chapter 6 Chapter 6 Inter Inter- VLAN Routing VLAN Routing CCNA3-2 Chapter 6 Note for Instructors Note for Instructors • These presentations are the result of a collaboration among These presentations are the result of a collaboration among the instructors at St. Clair College in Windsor, Ontario. the instructors at St. Clair College in Windsor, Ontario. • Thanks must go out to Rick Graziani of Cabrillo College. His Thanks must go out to Rick Graziani of Cabrillo College. His material and additional information was used as a reference material and additional information was used as a reference in their creation. in their creation. • If anyone finds any errors or omissions, please let me know If anyone finds any errors or omissions, please let me know at: at: • [email protected]. [email protected].
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CCNA3-1 Chapter 6
Chapter 6Chapter 6
InterInter--VLAN RoutingVLAN Routing
CCNA3-2 Chapter 6
Note for InstructorsNote for Instructors
•• These presentations are the result of a collaboration among These presentations are the result of a collaboration among the instructors at St. Clair College in Windsor, Ontario.the instructors at St. Clair College in Windsor, Ontario.
•• Thanks must go out to Rick Graziani of Cabrillo College. His Thanks must go out to Rick Graziani of Cabrillo College. His material and additional information was used as a reference material and additional information was used as a reference in their creation.in their creation.
•• If anyone finds any errors or omissions, please let me know If anyone finds any errors or omissions, please let me know at: at:
•• What is InterWhat is Inter--VLAN Routing?VLAN Routing?
•• Each VLAN is a Each VLAN is a unique broadcast domainunique broadcast domain..
•• Computers on separate VLANs are, Computers on separate VLANs are, by defaultby default, not , not able to communicate.able to communicate.
•• Each VLAN is a Each VLAN is a unique IP subnetworkunique IP subnetwork..
•• To allow VLANs to communicate, we need a router to To allow VLANs to communicate, we need a router to communicate among separate broadcast domains and communicate among separate broadcast domains and unique IP subnetworks.unique IP subnetworks.
•• InterInter--VLAN routingVLAN routing, then, , then, is a process of forwarding traffic is a process of forwarding traffic from one VLAN to another VLAN using a routerfrom one VLAN to another VLAN using a router. .
•• Traditional InterTraditional Inter--VLAN Routing:VLAN Routing:
•• Traditional routing requires routers to have Traditional routing requires routers to have multiple multiple physical interfacesphysical interfaces to facilitate interto facilitate inter--VLAN routing. VLAN routing.
•• Each interface is also configured with an Each interface is also configured with an IP address for IP address for the subnet associated with the particular VLANthe subnet associated with the particular VLAN that it is that it is connected to. connected to.
•• In this configuration, network devices can use the In this configuration, network devices can use the router router as a gatewayas a gateway to access the devices connected to the to access the devices connected to the other VLANs.other VLANs.
Interfaces and SubinterfacesInterfaces and Subinterfaces
CCNA3-10 Chapter 6
Traditional Inter-VLAN RoutingTraditional InterTraditional Inter--VLAN RoutingVLAN Routing
Interfaces and SubinterfacesInterfaces and Subinterfaces
for VLAN 30for VLAN 30And switches itAnd switches itto Port F0/1. to Port F0/1.
CCNA3-11 Chapter 6
Interfaces and SubinterfacesInterfaces and Subinterfaces
Traditional Inter-VLAN RoutingTraditional InterTraditional Inter--VLAN RoutingVLAN Routing
CCNA3-12 Chapter 6
•• Traditional InterTraditional Inter--VLAN Routing:VLAN Routing:
•• Traditional interTraditional inter--VLANVLANrouting using physicalrouting using physicalinterfaces interfaces does have adoes have alimitationlimitation. .
•• As the number of VLANsAs the number of VLANsincreasesincreases on a network, theon a network, thephysical approach of having one router interface per physical approach of having one router interface per VLAN quickly becomes hindered by the physical VLAN quickly becomes hindered by the physical hardware limitations of a router. hardware limitations of a router.
•• Routers have a limited number of physical interfacesRouters have a limited number of physical interfaces that that they can use to connect to different VLANs.they can use to connect to different VLANs.
•• It is very expensive to add an Ethernet Interface. It is very expensive to add an Ethernet Interface.
Interfaces and SubinterfacesInterfaces and Subinterfaces
•• Overcomes the hardware limitation of a router. Overcomes the hardware limitation of a router.
•• Subinterfaces are softwareSubinterfaces are software--based virtual interfaces based virtual interfaces that are assigned to physical interfacesthat are assigned to physical interfaces. .
•• Each subinterface is configured with its Each subinterface is configured with its own IP own IP address, subnet mask, and unique VLAN assignmentaddress, subnet mask, and unique VLAN assignment..
•• Connected to a Connected to a switch trunk linkswitch trunk link. .
•• Functionally the same as using the traditional routing Functionally the same as using the traditional routing model.model.
Interfaces and SubinterfacesInterfaces and Subinterfaces
CCNA3-14 Chapter 6
Interfaces and SubinterfacesInterfaces and Subinterfaces
•• Create the subinterface:Create the subinterface:
•• The syntax for the subinterface is always the The syntax for the subinterface is always the physical physical interfaceinterface, followed by a , followed by a periodperiod and a and a subinterface subinterface numbernumber. .
•• The subinterface number is configurable, but it is The subinterface number is configurable, but it is typically associated to reflect the VLAN numbertypically associated to reflect the VLAN number..
NOTE: NOTE: The management VLAN must also be The management VLAN must also be configured if you wish to use it on multiple switches configured if you wish to use it on multiple switches that are not directly connected by trunk links.that are not directly connected by trunk links.
Interfaces and SubinterfacesInterfaces and Subinterfaces
•• Before assigning an IP Address, the interface must to Before assigning an IP Address, the interface must to be configured to operate be configured to operate on a specific VLANon a specific VLAN using the using the proper proper encapsulationencapsulation..
•• The IP Address assigned here will become the The IP Address assigned here will become the default default gatewaygateway for that VLAN.for that VLAN.
R1(R1(configconfig--subifsubif)#)#ip address ip address [address] [mask][address] [mask]
Interfaces and SubinterfacesInterfaces and Subinterfaces
•• Subinterfaces are not enabled individually.Subinterfaces are not enabled individually.
•• When the physical interface is enabled, When the physical interface is enabled, all associatedall associatedsubinterfacessubinterfaces are enabled.are enabled.