Switching/routing problems with a 4908G

[GrouseMan]

I'm not sure if this is even the right forum...after all Cisco calls the 4908G a "switch router." However, I need some help getting packets to route between the interfaces. First, a little background:

I inherited a class B network 10.100.0.0 (s/m 255.255.0.0). After some research I've decided to "segment" the LAN to improve the performance. I thought I would take three Cisco 3548s and connect one of their gigabit interfaces to the 4809G, thus giving each group of 48 users a 1 gigabit link back to the server switch. I've setup a new network 10.200.1.0 (s/m 255.255.255.0). I've assigned an IP address on this network to one of the interfaces on the 4908. (The other interface has an address on the old 10.100.0.0 network.) I've taken one of the 3548s given it an IP address (10.200.1.2) on the new 10.200.1.0 network and connected it to the cooresponding interface on the 4908.

My laptop is plugged into the new 3548 switch with a static IP address on the 10.200.1.0 network. I can ping the 10.200.1.1 interface on the 4908, I can also ping the 10.100.0.3 interface on the 4908. But I cannot get connectivity to any of the other resources on the 10.100.0.0 network (i.e. router, DHCP server, etc.). Why would this be?

There is a VLAN interface defined on the 4908 interface for the original network. Do I need to define VLANs on all of the interfaces that I want to use? I thought I could switch packets between the interfaces of the 4908 without using VLANs. Not having any experience with VLANs, I might be completely off-base.

I find myself at a loss with this switch. Any help would be greatly appreciated.

Thanks in advance.

-Troy

 

[croth]

Is IP routing enabled on the switch? command: ip routing :in global config mode.
Also are you using RIP or OSPF?
For your DHCP server add the command, IP HELPER-ADDRESS <ip of dhcp Server> to the interfaces and allow ip directed broardcast.

 

[GrouseMan]

First off, thank you Croth for your comments. I appreciate your help.

I have enabled IP routing on the 4908G. And as far as I can tell there we are not using either the RIP or OSPF protocols.

I have the IP HELPER-ADDRESS defined in each of the interfaces and have allowed for IP DIRECTED-BROADCASTS.

I still can't ping anything on the original network 10.200.0.0.

One thing I have found out is that this switch was originally purchased to help manage the multicast packets created by video training system the company has. The 3548 switches are connected together and there is a VLAN1 interface defined in each of them with an IP address of 10.100.10.2 and 10.100.10.3 respectively.

Do I need to configure a VLAN interface on the 4908 to use it as a catalyst switch and not just a multicast packet manager?