I have a 3560 Multilayer switch that uplinks to the a router. The router's fa 0/0 interface is addressed 10.4.0.0/24. which leads to our WAN. Behind the 3560 on my LAN I have multiple VLANs, 10.4.1.0/24, 10.4.2.0/24, 10.4.3.0/24 etc. I'm running EIGRP on both the multilayer switch and router and redistributing EIGRP into RIPv2, RIPv2 is running on the edge routers that feed routes to the WAN. On the other end of the WAN those routers are getting my routes via the redistribution as /24 routes. How can I clean this up? If I change my IP address on my router's fa 0/0 interface to /16 can I then just advertise 10.4.0.0/16 to the WAN by using RIP and a network 10.4.0.0 255.255.0.0 command under RIP, and then turn off EIGRP on the multilayer switch and stop redistribution?
Will that work, or is there a better way to do it?
You don't have to tweak the subnet mask on the WAN facing interface as that would result in overlapping IP subnets usage in your network, though it may work it can potentially cause some problems. Use the 'ip summary-address' command under the WAN interface to advertise a summary-route as follows.
description wan connection
ip summary-address rip 10.4.0.0 255.255.0.0