What is Inter-VLAN Routing Three primary · PDF file · 2015-04-232 Outline...
Transcript of What is Inter-VLAN Routing Three primary · PDF file · 2015-04-232 Outline...
Inter VLAN Routing
Computer and Data Communication Laboratory
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Outline
� Inter-VLAN Routing
� Configuring Inter-VLAN Routing
� Troubleshooting Inter-VLAN Routing
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What is Inter-VLAN Routing
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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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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
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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
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Traditional Inter-VLAN Routing - 2
� Switch S2 forwards out the the active trunk interface to switch S1
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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
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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
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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
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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
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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
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Configure Traditional Inter-VLAN Routing
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Configure Router-on-a-Stick Inter-VLAN Routing
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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
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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 ?