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instance-type vrf vs virtual-router

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  • 1.  instance-type vrf vs virtual-router

    Posted 03-22-2010 09:43

    can anyone give practical differences between VRF and VR ?

    What can be done using VRF and can't be in VR ?

     

     



  • 2.  RE: instance-type vrf vs virtual-router

    Posted 04-01-2010 22:23

     zas71

     

    that's a question i would like to get answer to myself.



  • 3.  RE: instance-type vrf vs virtual-router

    Posted 04-02-2010 06:09

    I believe a VRF is more used for L2/L3 VPNs and the like, as it requires you to configure a Route Target and Route Distinguisher

     

    a Virtual Router is just a separate routing table

     

     

    if someone has more insight please feel free -- that's my very basic understanding of them 🙂

     

    Will



  • 4.  RE: instance-type vrf vs virtual-router

     
    Posted 04-02-2010 11:53

    Wimclend, you've got it precisely

     

    VRF is used in an MPLS/VPN architecture like you said and virtual router is used to have separate routing table in the other cases (without MPLS core)

     

    That's all



  • 5.  RE: instance-type vrf vs virtual-router
    Best Answer

    Posted 04-02-2010 13:58

     


    @Loup2 wrote:

    Wimclend, you've got it precisely

     

    VRF is used in an MPLS/VPN architecture like you said and virtual router is used to have separate routing table in the other cases (without MPLS core)

     

    That's all


     

     

    That's a very concise answer Smiley Happy

    There are more subtle differences which are derived from this fact above:

    1/ OSPF inside VRF automatically sets DN-bit and route-tag whereas OSPF inside VR does not

    2/ VRF automatically imports MP-BGP routes with matching route-target, VR does not

    3/ usually packets from the core enter VRF based on VPN label whereas to put packets from inet.0 into VR you need to explicitly configure FBF or logical-tunnel(s) between inet.0 and VR

    HTH

    Regards

    Alex

     



  • 6.  RE: instance-type vrf vs virtual-router

    Posted 04-02-2010 21:56

    thanks for the replies



  • 7.  RE: instance-type vrf vs virtual-router

    Posted 03-18-2019 07:17

    Like others said VRF is used with MPLS.  To map the logic to cisco's wording, virtual-router is like vrf-lite.