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default gateway for IDF switches

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  • 1.  default gateway for IDF switches

    Posted Nov 09, 2018 12:55 PM

    I have CoreSw1 with below vlan and ip address:

    vlan 1 -> 10.1.1.1

    vlan 2 -> 10.1.2.1

    vlan 3 -> 10.1.3.1

    vlan 4 -> 10.1.4.1

     

    I have IDF1 and IDF2 connected to the CoreSw1. Both switch have only one ip address for vlan1 as:

    IDF1 -> 10.1.1.2

    IDF2 -> 10.1.1.3

     

    Can I set ip default-gateway for both IDF switches to any vlan ip address of the CoreSw1?



  • 2.  RE: default gateway for IDF switches

    EMPLOYEE
    Posted Nov 09, 2018 01:02 PM

    Greetings!

     

    You would set the default gateway to the IP address in the same subnet as the IP on the switch you're configuring (so, presuming that these are /24 subnets, you would set the default gateways on IDF1 and IDF2 to 10.1.1.1). 



  • 3.  RE: default gateway for IDF switches

    Posted Nov 09, 2018 01:57 PM

    Hi Matt,

     

    So why I cannot set 10.1.2.1 or 10.1.3.1 or 10.1.4.1?



  • 4.  RE: default gateway for IDF switches

    MVP GURU
    Posted Nov 10, 2018 11:51 AM
    @Nick IT wrote:

    Hi Matt,

     

    So why I cannot set 10.1.2.1 or 10.1.3.1 or 10.1.4.1?

    No, need to be on the same subnet



  • 5.  RE: default gateway for IDF switches

    Posted Nov 12, 2018 09:06 AM

    What will happen if it set to different vlan ip address as def. gateway?

     

    Also if give ip address to vlan 3 on the IDF switches, can I set def. gateway for the vlan?



  • 6.  RE: default gateway for IDF switches

    Posted Nov 13, 2018 09:33 AM

    Maybe you are allowed to add those default routes, but IDF1/2 will think: whatever network I have to reach, throw the packet to default gateway 10.1.3.1, but where is that IP address?, does it belong to a network where I have a virtual interface?, the answer is: No, I only have a virtual interface on 10.1.1.0/24, I do not have a virtual interface in network 10.1.3.0/24, so I cannot throw the packet to next hop 10.1.3.1, so the packet is discarded.
    Hope this helps you. Please give some extra kudos.
    Pedro