So guys I'm at a loss here. We have a LAN in which we need to simulate user devices being able to send IGMP multicast traffic between networks. In this lab there is an old 3750 48 port switch and a 3800 router.
Don't scream it was this way before I started but the switch is essentially blank. All devices plugged into it are assigned to vlan 1 as access ports and the customer says this setup is working. So I powered up the router blank at this point also and connected f1/0/48 on the switch into G0/1 on the router.
No connection which is to be expected at this point. I logged into the router and no shut port G0/1 which brought it up. I then configured f1/0/48 on the switch as a trunk port with the following commands (switchport trunk encapsulation dot1q, switchport mode trunk). I then gave the switch a management vlan of 200 with an address of 10.0.0.10. Finally on the switch I set the default-gateway to 10.0.0.30.
Back on the router I made a sub interface g0/1.200 and set encapsulation to dot1q. Finally, the last two things I did were to enable multicast with ip multicast-routing and made a default route to the switch 0.0.0.0 0.0.0.0 g0/1.
Right the two devices can see each other via show CDP neighbors but they cannot ping each other or telnet to each other.