Cisco Cisco Unity Express for SRE

 shows packet flow between applications on different modules over MGF.

In releases earlier than Cisco IOS Release 15.1(3)T, the slot/1 interface is created and you can assign an 
IP address to the interface. You could then use High-Speed Intrachassis Module Interconnect (HIMI) 
connections or VLAN connections to connect different modules via the MGF switch.

In Cisco IOS Release 15.1(3)T and later releases, the behavior of the Cisco SRE SM modules is different. 
By default, the slot/1 interface is now managed by the switch-pm. As a result, the MGF interface behaves 
like a switch port and creates VLAN 1 by default. VLAN 1 is created by default when there are switch 
modules inserted into the router. The exception to this is that any Cisco EtherSwitch Service Modules 
will not create VLAN 1 by default because they have separate switch Cisco IOS software running as a 
separate entity.

HIMI connections are not supported on the MGF interfaces in Cisco IOS Release 15.1(3)T and later 
releases. If the router already has legacy switch modules Cisco EtherSwitch HWIC or Cisco EtherSwitch 
Network Module, the slot/1 interface behaves as in releases earlier than Cisco IOS Release 15.1(3)T and 
IP addresses can be assigned to the interfaces. HIMI or VLAN connections can be used to connect 
modules, as explained earlier.

 shows the compatibility between modules using MGF.

208864

Router

CPU

interface vlan 10
10.10.10.1

SM 3/1
10.10.10.3

SM 2/1
10.10.10.2

Video

application

MGF

Cisco

AXP

VLAN 10

10.10.10.x

Cisco Enhanced

EtherSwitch

Service Module

Supported. Requires external 
stacking. Limited to two switch 
modules.

Supported. Needs external 
trunking, if desired; no need to 
connect together.