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8643 Views 4 Replies Latest reply: Oct 20, 2009 12:55 PM by Conwyn RSS

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VRF on L3 switch

Oct 19, 2009 5:49 PM

Shaikh  Nizamuddin 10 posts since
Jul 8, 2008

Hi Guys,

 

I have some questions abt vrf.

what is vrf?

how it is used in layer 3 switch like 6509?

 

till date i have seen vrf being mostly used in MPLS VPN but how one can use it on a core switch to support different customers which are using different type of wan connectivity?

 

 

Nizam

  • Scott Morris - CCDE/4xCCIE/2xJNCIE 8,398 posts since
    Oct 7, 2008
    Currently Being Moderated
    1. Oct 19, 2009 6:03 PM (in response to Shaikh Nizamuddin)
    Re: VRF on L3 switch

    A VRF is a Virtual Routing/Forwarding instance.  In other words, a "mini routing table" that's isolated from all the others.

     

    While it comes from MPLS VPNs, you can use it without MPLS entirely.  This is called VRF-Lite.  And basically what it does is disables the requirement for an MBGP back-end to exist.  So you'll just have some interfaces with Cust-A, some with Cust-B, etc.  And each operates in their own little world without regard/care for anyone else.  

     

    HTH,

     

    Scott

  • Conwyn 7,907 posts since
    Sep 10, 2008
    Currently Being Moderated
    2. Oct 19, 2009 11:06 PM (in response to Shaikh Nizamuddin)
    Re: VRF on L3 switch

    Hi Shaikh

     

    ip vrf NetworkA
    rd 81:81
    !
    ip vrf NetworkB
    rd 82:82

    !

    interface FastEthernet0/0
    ip vrf forwarding NetworkA
    ip address 10.0.0.1 255.255.255.0
    duplex auto
    speed auto
    !
    interface FastEthernet0/1
    ip vrf forwarding NetworkB
    ip address 10.0.0.1 255.255.255.0
    duplex auto
    speed auto

     

    Router#show ip int brief
    Interface                  IP-Address      OK? Method Status                Protocol
    FastEthernet0/0            10.0.0.1        YES manual up                    up

    FastEthernet0/1            10.0.0.1        YES manual up                    up

     

    Regards Conwyn

  • Scott Morris - CCDE/4xCCIE/2xJNCIE 8,398 posts since
    Oct 7, 2008
    Currently Being Moderated
    3. Oct 20, 2009 6:08 AM (in response to Conwyn)
    Re: VRF on L3 switch

    Just a quick point there Conwyn.

     

    The better show commands would be "show ip route" and "show ip route vrf NetworkA" and "show ip route vrf NetworkB"

     

    Scott

  • Conwyn 7,907 posts since
    Sep 10, 2008
    Currently Being Moderated
    Re: VRF on L3 switch

    Hi Scott

     

    Oh No - you spotted my little joke of duplicate IPs on the router.  I really do use VRF lite.

     

    Regards Conwyn

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