MX105 warm spare no ARP

[dhayes89]

We have to MX 105 setup for HA using warm spare configuration. Each MX015 is connected to a different L3 switch( Cisco 9500-40X), both WAN 1 interfaces are in the same vlan 100. Vlan 100 is configured using a SVIs on each switch and configured for HSRP.   Each MX is configured with a static IP: MX-1 10.100.100.16/24 and MX-2 10.100.100.15/24, virtual ip 10.100.100.17/24  GW 10.100.100.4/24. MX-1 register with Meraki Cloud using WAN 1, MX-2 couldn't register with Meraki Cloud using WAN 1. Look at the MAC table for vlan 100 both MXs MAC address are listed, the arp table for vlan 100 only has the arp for MX-1. Tried clearing the mac, rebooting the warm spare, disabling and enabling the switch port still had the same issue, no arp. Any ideas why the MX-2 is not advertising its IP address ?

[KH]

Hey @dhayes89 

If you see it in the MAC table but not the ARP table it doesn't sound like the static IP address might have been taken by the MX or it might have been factory reset and doesn't have an IP. Are you able to double check the local status page to confirm the static IP exists. If it does, are your 9500-40X devices capable of taking packet captures, we would want to see what kind of packets MX2 is generating.

[PhilipDAth]

If you are using the copper WAN ports, they need to be plugged in at power up time to be used.  So if you are using the copper WAN ports - try power cycling the MX.