I've got a 3850 stack running IOS: Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.06.04.E RELEASE
It's setup as an L3 switch with two Vlans (Voice & Data) and a default route to a WatchGuard Firewall cluster, the issue is the WG Firewall cluster appears to use VRRP so the mac-address for the cluster is:
With the switch in L3 mode I'm unable to get the Cisco to communicate with the WatchGuard cluster and if I try the old static ARP & static mac trick similar to what you use with Multicast NLB (for Windows) I get as far as the MAC entry then get the below:
mac address-table static 0000.5e00.0106 vlan 10 interface GigabitEthernet1/0/1 GigabitEthernet2/0/5 %Cannot configure a static entry for an address used by the router
At the moment I'm a bit stuck as I've had to set the clients default gateway to be the WatchGuard directly as opposed to the 3850, I assume I can't add a static entry for the mac due to some internal logic in IOS XE about MAC and VRRP entries (in case I ever configured VRRP)??
It's purely a next hop IP at the moment, if I did it based on interface that would be difficult as the WG FW is in the same subnet (still doesn't ping). So the next hop interface could be one of two ports depending on which cluster member was active?
The switch is 172.27.21.254 and the WG is 172.27.21.1 both in Vlan10, the Vlan10 SVI should be the client default gateway.
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