I have a 2851 with an MW-ESW-16 card. I can route just fine between either of the 2851's GigE interfaces and the ESW-16's interfaces, but cannot get it to route between 2 ESW-16 interfaces.
Here are my port configs.
interface FastEthernet1/3 description LAN I/F no switchport ip address 10.255.253.254 255.255.255.0 duplex full speed 10
interface FastEthernet1/15 description WAN access no switchport ip address 192.168.255.233 255.255.255.248 ip ospf cost 1 duplex full speed 100
Am I missing something obvious?