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Inter-VLAN routing              CCNA Exploration Semester 3                                Chapter 630 Sep 2012           ...
Topics Routing network traffic between VLANs Configuring a router for routing between  VLANs Troubleshoot inter-VLAN co...
Semester 3                 LAN Design  Basic Switch                      Wireless  ConceptsVLANs                  STPVTP  ...
Inter VLAN routing                                    Switch keeps                                    VLANs               ...
Traditional inter-VLAN routing The router has one physical port for each  VLAN. Each port has an IP address on its own  ...
Traditional inter-VLAN routing                                       Router looks up                                      ...
Traditional inter-VLAN routingTrunksbetweenswitches.No trunk torouter.No tags onframes torouter.                          ...
Trunk to the router You  soon run out of router ports. What about making a trunk link to the router? A trunk link can b...
Router on a stickR1 F0/0 hassubinterfaces,one for eachVLAN.Each has itsown IPaddress.VLAN tags ontrunk.                   ...
Availability of trunking Not  all routers allow subinterfaces for VLAN  trunking on Ethernet ports. It depends on the IO...
Subinterfaces Subinterfaces   take the interface name  followed by a dot and a number. It is normal to use the VLAN numb...
Configuring subinterfaces R1(config)#interface  f0/0.10 R1(config-subif)#encapsulation dot1q 10 R1(config-subif)#ip add...
Routing table Subinterfaces   are shown  172.17.0.0/24 is subnetted, 2 subnetsC    172.17.10.0 is directly connected,  Fa...
Subinterface considerations Routers  have a limited number of interfaces,  so subinterfaces help where there are many  VL...
Multilayer switchA  multilayer switch can  route between VLANs. But that’s CCNP.                                     15 ...
Revision There is some revision of setting up VLANs  and VLAN trunking. Much of the router material is revision  because...
Troubleshooting Check    physical connections Check switchport VLAN assigment Check trunking on switches Check IP addr...
The End30 Sep 2012   S Ward Abingdon and Witney College       18
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Chapter 6 intervlanrouting

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Chapter 6 intervlanrouting

  1. 1. Inter-VLAN routing CCNA Exploration Semester 3 Chapter 630 Sep 2012 S Ward Abingdon and Witney College 1
  2. 2. Topics Routing network traffic between VLANs Configuring a router for routing between VLANs Troubleshoot inter-VLAN connectivity issues 2 30 Sep 2012 S Ward Abingdon and Witney College
  3. 3. Semester 3 LAN Design Basic Switch Wireless ConceptsVLANs STPVTP Inter-VLAN routing 330 Sep 2012 S Ward Abingdon and Witney College
  4. 4. Inter VLAN routing Switch keeps VLANs separate. Router can route between VLANs (subnets). 430 Sep 2012 S Ward Abingdon and Witney College
  5. 5. Traditional inter-VLAN routing The router has one physical port for each VLAN. Each port has an IP address on its own VLAN. Routing is the same as routing between any subnets. 5 30 Sep 2012 S Ward Abingdon and Witney College
  6. 6. Traditional inter-VLAN routing Router looks up Router sends out 192.168.2.0 network to packet through F0/1 – port F0/1 F0/2 switchport Send requestto ARP packet to F0/0 MAC address find of router Switchport F0/2 is of default gateway on VLAN30 and forwards to PC3.PC1 has apacket for192.168.2.19– differentsubnet 6 30 Sep 2012 S Ward Abingdon and Witney College
  7. 7. Traditional inter-VLAN routingTrunksbetweenswitches.No trunk torouter.No tags onframes torouter. 7 30 Sep 2012 S Ward Abingdon and Witney College
  8. 8. Trunk to the router You soon run out of router ports. What about making a trunk link to the router? A trunk link can be used with several VLANs on the same physical port. But each VLAN needs a different IP address. So use subinterfaces, each with its own IP address. 8 30 Sep 2012 S Ward Abingdon and Witney College
  9. 9. Router on a stickR1 F0/0 hassubinterfaces,one for eachVLAN.Each has itsown IPaddress.VLAN tags ontrunk. 930 Sep 2012 S Ward Abingdon and Witney College
  10. 10. Availability of trunking Not all routers allow subinterfaces for VLAN trunking on Ethernet ports. It depends on the IOS feature set. Some of ours do, others do not. 10 30 Sep 2012 S Ward Abingdon and Witney College
  11. 11. Subinterfaces Subinterfaces take the interface name followed by a dot and a number. It is normal to use the VLAN number. If this ties in with the IP address, even better. E.g. interface f0/0.10 The subinterfaces each have an IP address. The physical interface has no IP address The physical interfaces needs no shutdown 11 30 Sep 2012 S Ward Abingdon and Witney College
  12. 12. Configuring subinterfaces R1(config)#interface f0/0.10 R1(config-subif)#encapsulation dot1q 10 R1(config-subif)#ip address 172.17.10.1 255.255.255.0 (add any other subinterfaces) R1(config-subif)#interface f0/0 R1(config-if)#no shutdown 12 30 Sep 2012 S Ward Abingdon and Witney College
  13. 13. Routing table Subinterfaces are shown 172.17.0.0/24 is subnetted, 2 subnetsC 172.17.10.0 is directly connected, FastEthernet0/0.10C 172.17.30.0 is directly connected, FastEthernet0/0.30 13 30 Sep 2012 S Ward Abingdon and Witney College
  14. 14. Subinterface considerations Routers have a limited number of interfaces, so subinterfaces help where there are many VLANs. Subinterfaces share the bandwidth on a physical interface so can cause bottlenecks. Cheaper to use subinterfaces. Simpler physical layout but more complex configuration with subinterfaces. 14 30 Sep 2012 S Ward Abingdon and Witney College
  15. 15. Multilayer switchA multilayer switch can route between VLANs. But that’s CCNP. 15 30 Sep 2012 S Ward Abingdon and Witney College
  16. 16. Revision There is some revision of setting up VLANs and VLAN trunking. Much of the router material is revision because semester 3 can be taken before or alongside semester 2. 16 30 Sep 2012 S Ward Abingdon and Witney College
  17. 17. Troubleshooting Check physical connections Check switchport VLAN assigment Check trunking on switches Check IP addressing and subnetting scheme in relation to VLANs Check router subinterface configuration 17 30 Sep 2012 S Ward Abingdon and Witney College
  18. 18. The End30 Sep 2012 S Ward Abingdon and Witney College 18

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