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Amit585731's avatar
Amit585731
Icon for Nimbostratus rankNimbostratus
Jan 01, 2017

ARP not showing on LTM table

Dear Expert,

 

We have an LTM for which on interface 1.1 we have 2 interface tag e.g vlan 10 and vlan 20, which is connected to layer 2 switch and layer 3 is created on firewall. The issue I am seeing is I am learning mac for vlan 10 only and not vlan 20. I checked on layer 2 and vlan10, 20 is allowed on both ports (connected to firewall and ltm). Please suggest what can be the issue?

 

Thanks.

 

application delivery
LTM

2 Replies

  • boneyard's avatar
    boneyard
    Icon for MVP rankMVP
    Jan 01, 2017

    you are sure both VLANs are tagged on the interface 1.1? do you have a self IP on the subnet belonging to the vlan 20 network? can you ping the firewall on that subnet? does the BIG-IP show the arp entry for the firewall on that network?

     

  • Hamish's avatar
    Hamish
    Icon for Cirrocumulus rankCirrocumulus
    Jan 03, 2017

    As boneyard requested... Plus a network diagram... Do you have anything actually on VLAN20 to learn? Have you tried communicating with them? What's a tcpdump show? Are both VLAN's trunked & allowed on the switchport?

     

    H