I have 2 Cisco 3640 (Cisco1 & Cisco2) connected to a firewall (static routing) and behind it there is a DMZ. A group of customers are connected to Cisco1 and other group is connected to Cisco2. In case that Cisco 1 goes down , how can I change the route to Cisco 2.?
In case cisco1 goes down, how will you be able to connect to the customers that are connected to it? The customers must be connected to both routers then, correct? If that is the case, then use MHSRP (cisco1 is active for 1 group of clients and backup for the other group and cisco2 vice versa) on the routers.
Several Ethernet (Lance and QUICC) controllers in low-end products can only have a single unicast MAC address in their address filter. On these platforms only a single HSRP group is permitted, and the interface address is changed to the HSRP virtual MAC address when the group becomes Active.
If the 3600 doesn't support it, try using subinterfaces and have one group on one subinterface and the second on a second subinterface. I haven't tried this, so if you have a lab, but it may work.
Another alternative is to put a layer 3 switch (eg 2948G-L3) inbetween the 3600s and the firewall and have the firewall point to the switch, and the switch route between the 2 routers and itself. More expensive but will work.
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