This document discusses inter-VLAN routing and different methods for implementing it. It introduces inter-VLAN routing as a process of forwarding traffic between VLANs using a router. There are three main methods discussed: traditional routing using one interface per VLAN, router-on-a-stick using subinterfaces on a single router interface, and switch-based routing using switch virtual interfaces. The document provides detailed explanations and configurations for router-on-a-stick inter-VLAN routing.

1. CCNA3-1 Chapter 6
Inter-VLAN Routing
Introducing Inter-VLAN RoutingIntroducing Inter-VLAN Routing

2. 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

3. 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.
Introducing Inter-VLAN Routing

4. CCNA3-4 Chapter 6
• Traditional Inter-VLAN Routing:
• One router interface per VLAN.
Introducing Inter-VLAN Routing
VLANVLAN
TaggedTagged
VLANVLAN
TaggedTagged
Internally Routed toInternally Routed to
the proper subnet.the proper subnet.
Internally Routed toInternally Routed to
the proper subnet.the proper subnet.
TagTag
removedremoved
TagTag
removedremoved

5. 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

6. CCNA3-6 Chapter 6
Traditional Inter-VLAN RoutingTraditional Inter-VLAN RoutingTraditional Inter-VLAN RoutingTraditional Inter-VLAN Routing
Interfaces and Subinterfaces
TaggedTagged
VLAN 10VLAN 10
TaggedTagged
VLAN 10VLAN 10
TagTag
RemovedRemoved
TagTag
RemovedRemoved
RouterRouter
RespondsResponds
RouterRouter
RespondsResponds
Routing table:Routing table:
172.17.10.0 – F0/0172.17.10.0 – F0/0
172.17.30.0 – F0/1172.17.30.0 – F0/1
Routing table:Routing table:
172.17.10.0 – F0/0172.17.10.0 – F0/0
172.17.30.0 – F0/1172.17.30.0 – F0/1
Router tagsRouter tags
the framethe frame
for VLAN 30for VLAN 30
And switches itAnd switches it
to Port F0/1.to Port F0/1.
Router tagsRouter tags
the framethe frame
for VLAN 30for VLAN 30
And switches itAnd switches it
to Port F0/1.to Port F0/1.

7. CCNA3-7 Chapter 6
Interfaces and Subinterfaces
Traditional Inter-VLAN RoutingTraditional Inter-VLAN RoutingTraditional Inter-VLAN RoutingTraditional Inter-VLAN Routing

8. 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.
Interfaces and Subinterfaces

9. CCNA3-9 Chapter 6
• Router-on-a-stick Inter-VLAN Routing:
• One router interface for all VLANs.
Introducing Inter-VLAN Routing
VLANVLAN
TaggedTagged
VLANVLAN
TaggedTagged
Internally Routed toInternally Routed to
the proper subnet.the proper subnet.
Internally Routed toInternally Routed to
the proper subnet.the proper subnet.
TagTag
removedremoved
TagTag
removedremoved

10. 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.
Interfaces and Subinterfaces

11. CCNA3-11 Chapter 6
Interfaces and Subinterfaces
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
TaggedTagged
VLAN 10VLAN 10
TaggedTagged
VLAN 10VLAN 10
TagTag
RemovedRemoved
TagTag
RemovedRemoved
Routing table:Routing table:
172.17.10.0 – F0/0.10172.17.10.0 – F0/0.10
172.17.30.0 – F0/0.30172.17.30.0 – F0/0.30
Routing table:Routing table:
172.17.10.0 – F0/0.10172.17.10.0 – F0/0.10
172.17.30.0 – F0/0.30172.17.30.0 – F0/0.30
TaggedTagged
VLAN 30VLAN 30
TaggedTagged
VLAN 30VLAN 30
TagTag
RemovedRemoved
TagTag
RemovedRemoved
TaggedTagged
VLAN 30VLAN 30
TaggedTagged
VLAN 30VLAN 30
TagTag
RemovedRemoved
TagTag
RemovedRemoved

12. 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.
Interfaces and Subinterfaces

13. 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.
Interfaces and Subinterfaces

14. 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
Interfaces and Subinterfaces

15. 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]
Interfaces and Subinterfaces

16. 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
Interfaces and Subinterfaces

17. CCNA3-17 Chapter 6
• Router-on-a-stick Inter-VLAN Routing:
• Configuring Subinterfaces:
Interfaces and Subinterfaces
VLAN 10VLAN 10VLAN 10VLAN 10VLAN 10VLAN 10VLAN 10VLAN 10
VLAN 30VLAN 30VLAN 30VLAN 30
VLAN 10VLAN 10VLAN 10VLAN 10
VLAN 30VLAN 30VLAN 30VLAN 30
Enable InterfacesEnable InterfacesEnable InterfacesEnable Interfaces

18. CCNA3-18 Chapter 6
• Router-on-a-stick Inter-VLAN Routing:
• Configuring Subinterfaces:
Interfaces and Subinterfaces
Planning!Planning!Planning!Planning!

19. CCNA3-19 Chapter 6
• Router Interface and Subinterface Comparison:
Interfaces and Subinterfaces

20. CCNA3-20 Chapter 6
• Layer 3 Switch Inter-VLAN Routing:
• Uses Switch Virtual Interfaces (SVI) to retag
the frame.
Introducing Inter-VLAN Routing
VLANVLAN
TaggedTagged
(10)(10)
VLANVLAN
TaggedTagged
(10)(10)
TagTag
removedremoved
TagTag
removedremoved

21. CCNA3-21 Chapter 6
Inter-VLAN Routing
Configuring Inter-VLAN RoutingConfiguring Inter-VLAN Routing
(Putting It All Together)(Putting It All Together)

22. CCNA3-22 Chapter 6
• Traditional Inter-VLAN Routing:
Configuring Inter-VLAN Routing

23. CCNA3-23 Chapter 6
• Traditional Inter-VLAN Routing:
Configuring Inter-VLAN Routing

24. CCNA3-24 Chapter 6
• Traditional Inter-VLAN Routing:
Configuring Inter-VLAN Routing

25. CCNA3-25 Chapter 6
• Router-on-a-stick Inter-VLAN Routing:
Configuring Inter-VLAN Routing
VLANsVLANsVLANsVLANs
TrunkTrunkTrunkTrunk
InterfacesInterfacesInterfacesInterfaces
VLANsVLANsVLANsVLANs
Trunk inTrunk in
Native VLANNative VLAN
Trunk inTrunk in
Native VLANNative VLAN

26. CCNA3-26 Chapter 6
• Router-on-a-stick Inter-VLAN Routing:
Configuring Inter-VLAN Routing
VLAN 10VLAN 10VLAN 10VLAN 10
VLAN 30VLAN 30VLAN 30VLAN 30
Enable AllEnable All
SubinterfacesSubinterfaces
Enable AllEnable All
SubinterfacesSubinterfaces