Porting bridging onto L3 switch from 3640

[pcanters]

I am trying to take a 3640 router out of a network. It currently does L3 routing to seperate subnets as such, the interface look like this:

Interface fastethernet 0/0

ip address 192.168.32.1 255.255.255.0

ip address 192.168.61.1 255.255.255.0 secondary

bridge-group 1

I wish to move them onto a 4500 routed interface. I have about 10 of these interfaces on the existing router with about 10 secondary addresses on each interface

I have disabled L2 by issuing a no switchport command. My question is how to implement the bridged portion of the 3640 interface onto my L3 switch interface.

The 4500 that I am working with does not support the bridge command.

I realize that the switch is a bridge by default but how do I route and bridge on a L3 switchport similarly to a 3640 port ?

I think that I might not be able to do this, can anyone tell me any different...

Thanks in Advance

[pradeepde]

crb - concurrent routing and bridging will help you for u r scenario. try the below link

http://www.cisco.com/en/US/products/ps5853/products_configuration_guide_chapter09186a008045830f.html

[Richard Burts]

It seems to me that we are trying to make this more complicated than it needs to be. If this is the configuration:

Interface fastethernet 0/0

ip address 192.168.32.1 255.255.255.0

ip address 192.168.61.1 255.255.255.0 secondary

bridge-group 1

then it means that IP is being routed and something is being bridged that is not IP. If that is not the case then I hope that the original poster will clarify what is happening.

If the desire is to route IP and bridge some other protocol, then it should be enough to enable layer 2 on the interface(s) to do the switching/bridging and to configure a layer 3 SVI for routing IP. This should let the switch bridge the other traffic, which it will do by default and route the IP traffic.

HTH

Rick