I have a Cisco ASA 5520 firewall, where ethernet0/1 is connected to a cisco catalyst 2960 switch.
I also have a Cisco 3670 router, connected to the same switch. The Cisco router terminates several frame relay connections.
Randomly, I see entries such as this on my cisco router when I issue the sh arp command:
Internet 192.168.112.1 17 0f3b.d8bd.4162 ARPA Vlan2
The Vlan2 interface on my router is the one connected to the catalyst switch, and the MAC address above belongs to the ethernet0/1 interface on my ASA, so for some reason, although 192.168.112.0 is a frame network connected to an interface on my router, the switch somehow advertises that network to be reachable through my ASA.
I cannot use this guide since my switch OS does not support the vlan access-map command. What would you suggest me to do?