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CCNA 3.4.a: Router on a Stick

Overview:

Router on a stick is a means of connecting to two or more subnets via a single physical Layer 3 interface using subinterfaces.

 

Study Notes:

  • Router on a stick, a.k.a. One armed router or Stub router
  • Router on a stick is useful when needing to connect to multiple subnets from a single router port
  • Typically this is when you have multiple LAN networks on a router
  • The router interface is configured for layer3 using subinterfaces
  • The switch interface going to the router is a trunk port that tags the vlans you want to allow to the router
  • A native vlan is used on the trunk port to tag any untagged packets
  • The switch interfaces going to the PCs are access vlans with the appropriate vlan configured on them

 

PacketTracer Lab: CCNA-3.4.a-Router-on-a-stick.pkt

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Links:

https://www.cisco.com/c/en/us/support/docs/lan-switching/inter-vlan-routing/14976-50.html?dtid=osscdc000283

 


   2 Comments


  1. Gwendoline Nubila
      February 26, 2019

    on the switch config for int fa0/1, the command switchport native vlan 678 does not work.I used switchport trunk native vlan 678 and it went through.

    • Joe Barger (CCNP/CCDP)
        February 26, 2019

      That’s interesting. Thanks for pointing that out. I’m running PacketTracer 7.0.0.0306. This version accepts the command switchport native vlan 678, but it then changes the running-config to switchport trunk native vlan 678. It appears the forums discuss this as well – https://learningnetwork.cisco.com/thread/73113. I’ve updated the labs to include trunk in the command. Thanks!

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