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Jeff_46763's avatar
Jeff_46763
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Jun 20, 2014

Default Route Setup with Multiple /26 VLANS

Hi Everyone,

 

A new "business requirement" made us create over 53 VLANs now which are all /26. Each one has its own default gateway on the Layer 3 switch. I currently had a default route added to make the self-IP's talk to each other, but the address range for that fell into only 1 of the 53 VLAN subnets. SO....I had to add another VLAN today along with it's self IP info and I can't ping the HA peer's self. I'm pretty certain its the default route, as my tcpdump is showing the self reporting destination host unreachable. My question though, is how could I "easily" add multiple routes per VLAN? I probably have to remove the original default route which had only 1 /26 on it..Thanks

 

application delivery
deployment
design
LTM

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  • Matt_Breedlove_'s avatar
    Matt_Breedlove_
    Icon for Nimbostratus rankNimbostratus
    Jun 20, 2014

    Hi Jeff,

     

    You can simply add the additional routes per VLAN in the LTM config. Is it not allowing you to do so for the 53 /26's? Is there an error it is giving you?

     

    There aren't really any limitations on the LTM in regards to standard IPv4 routing. Regardless of the number of routes or vlans there should be no issue with inter-subnet communication Hope this helps

     

  • Matt_Breedlove_'s avatar
    Matt_Breedlove_
    Icon for Nimbostratus rankNimbostratus
    Jun 20, 2014

    Hi Jeff,

     

    You can simply add the additional routes per VLAN in the LTM config. Is it not allowing you to do so for the 53 /26's? Is there an error it is giving you?

     

    There aren't really any limitations on the LTM in regards to standard IPv4 routing. Regardless of the number of routes or vlans there should be no issue with inter-subnet communication Hope this helps

     

    • Jeff_46763's avatar
      Jeff_46763
      Icon for Nimbostratus rankNimbostratus
      Jun 23, 2014
      Thanks, no it is not letting me. I think the reason is that currently, we only have the 0.0.0.0 default route which points up to the L3 Gateway. If I were to add the gateway's in for the rest of the /26's.....I'd have to add the "destination", "netmask" and "gateway".....what would the "destination" be?? I would think it should just be a gateway IP address twice?? I would think a default route should have covered everything though?
  • Jeff_46763's avatar
    Jeff_46763
    Icon for Nimbostratus rankNimbostratus
    Jun 23, 2014

    Thanks for the help, looks like they created the VLAN at the host, but didn't apply it to the Guest under the "selected" VLANS. Once that happened, it re-arped and was golden. No route was needed