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Inter VLAN Routing Computer and Data Communication Laboratory 2 Outline Inter-VLAN Routing Configuring Inter-VLAN Routing Troubleshooting Inter-VLAN Routing 3 What is Inter-VLAN Routing 4 Three primary methods of Inter-VLAN Routing One router interface per VLAN Router on a stick (router subinterface) Multilayer switching (layer 3 switch)
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What is Inter-VLAN Routing Three primary · PDF file · 2015-04-232 Outline Inter-VLAN Routing Configuring Inter-VLAN Routing ... Traditional Inter-VLAN Routing - 1 One router...

Feb 22, 2018

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Page 1: What is Inter-VLAN Routing Three primary · PDF file · 2015-04-232 Outline Inter-VLAN Routing Configuring Inter-VLAN Routing ... Traditional Inter-VLAN Routing - 1 One router interface

Inter VLAN Routing

Computer and Data Communication Laboratory

2

Outline

� Inter-VLAN Routing

� Configuring Inter-VLAN Routing

� Troubleshooting Inter-VLAN Routing

3

What is Inter-VLAN Routing

4

Three primary methods of Inter-VLAN Routing

� One router interface per VLAN

� Router on a stick (router subinterface)

� Multilayer switching (layer 3 switch)

Page 2: What is Inter-VLAN Routing Three primary · PDF file · 2015-04-232 Outline Inter-VLAN Routing Configuring Inter-VLAN Routing ... Traditional Inter-VLAN Routing - 1 One router interface

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One router interface per VLAN

� Require multiple physical interfaces on both the router and switch 6

Router on a stick (router subinterface)

� Router must support 802.1q encapsulation and subinterface configure

7

Multilayer switching (layer 3 switch)

� Switch must support layer 3 routing function8

Traditional Inter-VLAN Routing - 1

� One router interface per VLAN

� Permit stations on VLAN10 and VLAN30 to communicate

Page 3: What is Inter-VLAN Routing Three primary · PDF file · 2015-04-232 Outline Inter-VLAN Routing Configuring Inter-VLAN Routing ... Traditional Inter-VLAN Routing - 1 One router interface

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Traditional Inter-VLAN Routing - 2

� Switch S2 forwards out the the active trunk interface to switch S1

10

Traditional Inter-VLAN Routing - 3

� Switch S1 then forwards the unicast traffic out port F0/6

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Traditional Inter-VLAN Routing - 4

� Router forwards the unicast traffic to switch S1 on VLAN 30

12

Traditional Inter-VLAN Routing - 5

� Switch S1 forwards the unicast traffic to S2 through the active trunk link

� Switch S2 then forward the unicast traffic to PC3 on VLAN30

Page 4: What is Inter-VLAN Routing Three primary · PDF file · 2015-04-232 Outline Inter-VLAN Routing Configuring Inter-VLAN Routing ... Traditional Inter-VLAN Routing - 1 One router interface

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Router-on-a-Stick Inter-VLAN Routing - 1

� Require a single physical interface router traffic between multiple VLANs on a network

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Router-on-a-Stick Inter-VLAN Routing - 2

� Router R1 accepts the tagged unicast traffic on VLAN10

� Route it to VLAN30 using its configured subinterfaces

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Switch-based Inter-VLAN Routing - 1

� Switch S1

� - remove the VLAN tag � forward the unicast traffic to VLAN10 Layer 3 interface � route to VLAN30

16

Switch-based Inter-VLAN Routing - 2

� Switch S1: retag it with VLAN30 � forward it out the active trunk link back to switch S2

� Switch S2: remove the VLAN tag frame � forward it out to PC3

Page 5: What is Inter-VLAN Routing Three primary · PDF file · 2015-04-232 Outline Inter-VLAN Routing Configuring Inter-VLAN Routing ... Traditional Inter-VLAN Routing - 1 One router interface

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Explain How Network Traffic is Routed

Between VLANs in a Converged Network

� Describe the role of interfaces and

subinterfaces in supporting inter-VLAN routing

18

Configure Traditional Inter-VLAN Routing

19

Configure Router-on-a-Stick Inter-VLAN Routing

20

Troubleshoot Common Inter-VLAN Connectivity Issues1

� Misconfigured VLAN membership

� Execute the switch access vlan 10 interface configuration

command on port F0/4 on switch S1

Page 6: What is Inter-VLAN Routing Three primary · PDF file · 2015-04-232 Outline Inter-VLAN Routing Configuring Inter-VLAN Routing ... Traditional Inter-VLAN Routing - 1 One router interface

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Troubleshoot Common Inter-VLAN Connectivity Issues2

� Subinterface configuration error

� Verify by enter the show interface or show running-config commands on R1

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Troubleshoot Common Inter-VLAN Connectivity Issues3

� Verification

commands

� Router

• show run

• show ip interface

� PC

• ipconfig

Question ?