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Cha ter 6 – Inter-VLAN Routin 

CCNA Exploration 4.0

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Objectives

• Learn about inter-VLAN routing and how it is used to

permit devices on separate VLANs to communicate.

• Learn different methods for accomplishing inter-VLANrouting, and the advantages and disadvantages of each.

earn ow eren rou er n er ace con gura ons ac a e

inter-VLAN routing.

• Troulbleshootin Inter-VLAN

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Introducing Inter-VLAN Routing

• ,on separate VLANs are, by default, not able tocommunicate.

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-

separate router connected to the switch infrastructure.

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Traditionnal Inter-VLAN

• PC1 in VLAN 10 communicate with PC3 in VLAN30

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ou er nee n er ace a

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Router on-a-stick

• PC1 in VLAN 10 communicate with PC3 in VLAN 30

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n y nee p ys ca n er ace on ou er. rea e su -

interfaces to serve communicating between VLANs

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Layer 3 Switch with Inter-VLAN

• Multilayer switches are capable of performing inter-VLAN

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Using Router as Gateway

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Using Router as Gateway

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Using Router as Gateway

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Using Router as Gateway

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Using Router as Gateway

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Using Router as Gateway

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Using Router as Gateway

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Using Router as Gateway

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Using Router as Gateway

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Using Router as Gateway

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Use sub-interfaces

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Use sub-interfaces

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Use sub-interfaces

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Use sub-interfaces

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Use sub-interfaces

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Use sub-interfaces

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Use sub-interfaces

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Use sub-interfaces

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Use sub-interfaces

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Use sub-interfaces

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Use sub-interfaces

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Comparison

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Traditional Inter-VLAN Configuration

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Verify

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Router on-a-stick Inter-VLAN configuration

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Verify

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Switch configuration issues

• Solution: Assign switchport fa0/4 to VLAN10

• “switchport access vlan 10”

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Switch configuration issues

• Solution: Configure switchport Fa/5 to mode Trunk

“ ” 

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Switch configuration issues

•  

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Router configuration issues

• Solution: Reconnect Router Fa0/0 – S1 Fa0/4

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Router configuration issues

• Solution:

• Fa0/0.10: “encapsulation dot1q 10”

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IP addressing Issues

o u on: e-con gure a : p a ress . . .

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IP addressing Issues

• Solution: Re-configure PC1: 172.17.10.21/24

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IP addressing Issues

• Solution: Re-configure PC1 subnet mask -> /24

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S

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Summary

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