Routed interface redundancy

Hello!

I have searched the forums and have found nothing for this situation.
I have a single Cisco 3640 router, a pair of Cisco switches and a pair
of firewalls. The firewalls are on a switch each and are running vrrp.
The switches are connected to my distribution layer. The problem I am
having is with the router configuration. I am trying to get the most
fault tolerant setup possible out of my current hardware. Is it
possible to have 2 ethernet interfaces act as one in the same? I
looked at Integrated and Concurrent routing a bridging and that seemed
to do the trick. Unfortunately, when I pulled one of the ethernet
ports to test the setup, the BVI interface went down. What am I
missing?

Thanks,
Bill

bridge irb
bridge 1 protocol ieee
bridge 1 route ip
bridge 1 bridge ip
!
interface FastEthernet3/0
description Primary Internet Connection 1
no ip address
duplex auto
speed auto
bridge-group 1
!
interface FastEthernet3/1
description Primary Internet Connection 2
no ip address
duplex auto
speed auto
bridge-group 1
!
interface bvi 1
description Primary Internet
mac-address 0204.0600.02E3
ip address xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
ip access-group 105 out
no ip redirects
no ip proxy-arp
ip accounting access-violations

.

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