I have a Cisco 3945E with two EtherSwitch modules (gi 1/0, gi 2/0) and a UCSE (ucse 4/0) server installed in it.

The short of it is i'd like to trunk VLANs to the two EtherSwitch modules, and place the UCSE's IMC on a server VLAN:

VLAN 08 - SERVER:  - Trunked to EtherSwitches, untagged to UCSE 4/0.
VLAN 16 - VOICE: - Trunked to EtherSwitches
VLAN 24 - DATA: - Trunked to EtherSwitches

I'm familiar with configuring a router on a stick, but totally lost as to how to assign the same broadcast domain (and IP address) to multiple interfaces on a router.


I've been able to use BVIs to span the broadcast domain to two of the router's ports, but UCSE is still giving me trouble:

interface GigabitEthernet0/0
 no ip address
 duplex auto
 speed auto
interface GigabitEthernet0/0.8
 encapsulation dot1Q 8 native
 bridge-group 8
interface ucse4/0
 ip unnumbered BVI8
 imc ip address default-gateway 
interface BVI8
 ip address

I have a device on gi 0/0 with ip and can ping it with no issues, but the IMC still cannot be reached. I've tried creating host routes from to bvi 8 and/or ucse 4/0 to no luck...

Any help is appreciated!

  • Do you have a network diagram of the desired end result? Aug 23, 2014 at 1:45

1 Answer 1


The configuration in the original post was close, but was missing a few key things:

interface ucse4/0
  ip unnumbered BVI8
  imc ip address default-gateway 
  imc access-port shared-lom console

ip route ucse 4/0

Note the imc access-port shared-lom console. It was the only way I could manage to get the IMC address pingable. I should also point out that by default, the BVI will not bring itself up unless there is another active port bridged to it.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.