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CCNA3-1 Chapter 6

Inter-VLAN Routing

Introducing Inter-VLAN RoutingIntroducing Inter-VLAN Routing

CCNA3-2 Chapter 6

• What is Inter-VLAN Routing?• Setiap VLAN memiliki unique broadcast domain.

• Computers yang terdiri dari VLANs yang terpisah, secara default, tidak dapat berkomunikasi.

• Setiap VLAN memiliki unique IP subnetwork.

• Agar VLANs dapat saling berkomunikasi, kita membutuhkan router untuk menghubungkan broadcast domains dan unique IP subnetworks yang berbeda.

• Oleh karena itu Inter-VLAN routing, merupakan sebuah process untuk melakukan forwarding traffic dari VLAN yang satu ke VLAN lainnya dengan menggunakan router.

Introducing Inter-VLAN Routing

CCNA3-3 Chapter 6

• Ada beberapa Methods dari Inter-Vlan Routing ini, yaitu:

1. Traditional Inter-VLAN Routing.

2. Router-on-a-stick Inter-VLAN Routing.

3. Switch Based Inter-VLAN Routing.


CCNA3-4 Chapter 6

• Traditional Inter-VLAN Routing:• One router interface per VLAN.


VLAN VLAN TaggedTaggedVLAN VLAN

TaggedTagged

Internally Routed to Internally Routed to the proper subnet.the proper subnet.Internally Routed to Internally Routed to the proper subnet.the proper subnet.

TagTagremovedremoved


CCNA3-5 Chapter 6

• Traditional Inter-VLAN Routing:• Traditional routing membutuhkan routers yang memiliki

multiple physical interfaces untuk memfasilitasi inter-VLAN routing.

• Masing-masing interface di configured dengan IP address dengan subnetnya sendiri yang terkait pada VLAN tertentu.

• Dalam configuration ini, network devices dapat menggunakan router sebagai gateway untuk mengaccess devices yang terhubung ke VLANs lainnya.

Interfaces and Subinterfaces

CCNA3-6 Chapter 6

Traditional Inter-VLAN RoutingTraditional Inter-VLAN RoutingTraditional Inter-VLAN RoutingTraditional Inter-VLAN Routing


TaggedTaggedVLAN 10VLAN 10TaggedTagged

VLAN 10VLAN 10TagTag

RemovedRemovedTagTag

RemovedRemoved

Router Router RespondsResponds

Router Router RespondsResponds

Routing table:Routing table:172.17.10.0 – F0/0172.17.10.0 – F0/0172.17.30.0 – F0/1172.17.30.0 – F0/1

Routing table:Routing table:172.17.10.0 – F0/0172.17.10.0 – F0/0172.17.30.0 – F0/1172.17.30.0 – F0/1

Router tagsRouter tagsthe framethe frame

for VLAN 30for VLAN 30And switches itAnd switches itto Port F0/1. to Port F0/1.

Router tagsRouter tagsthe framethe frame

for VLAN 30for VLAN 30And switches itAnd switches itto Port F0/1. to Port F0/1.

CCNA3-7 Chapter 6


Traditional Inter-VLAN RoutingTraditional Inter-VLAN RoutingTraditional Inter-VLAN RoutingTraditional Inter-VLAN Routing

CCNA3-8 Chapter 6

• Traditional Inter-VLAN Routing:• Traditional inter-VLAN

routing menggunakan

1 physical interfaces

per vlan. • Hal ini akan mengakibatkan keterbatasan dalam

penggunaannya, semakin banyak vlan yang digunakan maka semakin banyak interface yang diperlukan.

• Sementara routers memiliki batasan jumlah dari physical interfaces yang bisa digunakan.

• Dan hal tersebut akan membutuhkan biaya yang mahal karena keperluan penambahan modul Ethernet/Fastethernet Interface.


CCNA3-9 Chapter 6

• Router-on-a-stick Inter-VLAN Routing:• One router interface for all VLANs.


VLAN VLAN TaggedTaggedVLAN VLAN

TaggedTagged

Internally Routed to Internally Routed to the proper subnet.the proper subnet.Internally Routed to Internally Routed to the proper subnet.the proper subnet.



CCNA3-10 Chapter 6

• Router-on-a-stick Inter-VLAN Routing:• Subinterfaces:

• Overcomes the hardware limitation of a router. • Subinterfaces are software-based virtual interfaces

that are assigned to physical interfaces. • Each subinterface is configured with its own IP

address, subnet mask, and unique VLAN assignment.• Connected to a switch trunk link. • Functionally the same as using the traditional routing

model.


CCNA3-11 Chapter 6


Router-on-a-stick Inter-VLAN RoutingRouter-on-a-stick Inter-VLAN RoutingRouter-on-a-stick Inter-VLAN RoutingRouter-on-a-stick Inter-VLAN Routing




RemovedRemoved

Routing table:Routing table:172.17.10.0 – F0/0.10172.17.10.0 – F0/0.10172.17.30.0 – F0/0.30172.17.30.0 – F0/0.30

Routing table:Routing table:172.17.10.0 – F0/0.10172.17.10.0 – F0/0.10172.17.30.0 – F0/0.30172.17.30.0 – F0/0.30


VLAN 30VLAN 30

TagTagRemovedRemoved

TagTagRemovedRemovedTaggedTagged

VLAN 30VLAN 30TaggedTagged



RemovedRemoved

CCNA3-12 Chapter 6

• Router-on-a-stick Inter-VLAN Routing:• Configuring Subinterfaces:

• Similar to configuring physical interfaces.• Create the subinterface.• Assign it to a VLAN.• Assign an IP Address.• Enable the interface.


CCNA3-13 Chapter 6

• Router-on-a-stick Inter-VLAN Routing:• Create the subinterface:

• The syntax for the subinterface is always the physical interface followed by a period and a subinterface number.

• The subinterface number is configurable, but it is typically associated to reflect the VLAN number.

R1(config)#interface [interface].nn

NOTE: The management VLAN must also be configured if you wish to use it on multiple switches that are not directly connected by trunk links.


CCNA3-14 Chapter 6

• Router-on-a-stick Inter-VLAN Routing:• Assign it to a VLAN:

• Before assigning an IP Address, the interface must to be configured to operate on a specific VLAN using the proper encapsulation.

R1(config-subif)#encapsulation dot1q vlan-id


CCNA3-15 Chapter 6

• Router-on-a-stick Inter-VLAN Routing:• Assign an IP Address:

• The IP Address assigned here will become the default gateway for that VLAN.

R1(config-subif)#ip address [address] [mask]


CCNA3-16 Chapter 6

• Router-on-a-stick Inter-VLAN Routing:• Enable the interface:

• Subinterfaces are not enabled individually.• When the physical interface is enabled, all associated

subinterfaces are enabled.

R1(config-if)#no shutdown


CCNA3-17 Chapter 6



VLAN 10VLAN 10VLAN 10VLAN 10VLAN 10VLAN 10VLAN 10VLAN 10

VLAN 30VLAN 30VLAN 30VLAN 30



Enable InterfacesEnable InterfacesEnable InterfacesEnable Interfaces

CCNA3-18 Chapter 6



Planning!Planning!Planning!Planning!

CCNA3-19 Chapter 6

• Router Interface and Subinterface Comparison:


CCNA3-20 Chapter 6

• Layer 3 Switch Inter-VLAN Routing:• Uses Switch Virtual Interfaces (SVI) to retag

the frame.


VLAN VLAN TaggedTagged

(10)(10)

VLAN VLAN TaggedTagged

(10)(10)



CCNA3-21 Chapter 6

Inter-VLAN Routing

Configuring Inter-VLAN RoutingConfiguring Inter-VLAN Routing(Putting It All Together)(Putting It All Together)

CCNA3-22 Chapter 6

• Traditional Inter-VLAN Routing:

Configuring Inter-VLAN Routing

CCNA3-23 Chapter 6



CCNA3-24 Chapter 6



CCNA3-25 Chapter 6

• Router-on-a-stick Inter-VLAN Routing:


VLANsVLANsVLANsVLANs

TrunkTrunkTrunkTrunk

InterfacesInterfacesInterfacesInterfaces

VLANsVLANsVLANsVLANs

Trunk in Trunk in Native VLANNative VLAN

Trunk in Trunk in Native VLANNative VLAN

CCNA3-26 Chapter 6

• Router-on-a-stick Inter-VLAN Routing:




Enable All Enable All SubinterfacesSubinterfaces

Enable All Enable All SubinterfacesSubinterfaces

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