Cisco Cisco Unity Express for SRE

On Cisco ISRs G2 running a release earlier than Cisco IOS Release 15.1(3)T, you cannot configure 
MGF on Cisco Enhanced EtherSwitch Service Modules from the Cisco IOS software command line. The 
MGF interface was hidden from the user.

On Cisco ISRs G2 running Cisco IOS Release 15.1(3)T and later software, you can use the newly created 
MGF interface to configure trunk or access mode so that the traffic generated from Cisco Enhanced 
EtherSwitch Service Modules can be directed to other Cisco Enhanced EtherSwitch Service Modules or 
the VLAN interface. To configure Cisco Enhanced EtherSwitch Service Modules, see the product 
documentation.

On Cisco ISRs G2 running Cisco IOS Release 15.1(3)T and later software releases, you may configure 
the port on the Cisco Enhanced EtherSwitch Service Module side as follows:

interface GigabitEthernet1/1

 switchport mode trunk

interface GigabitEthernet2/1

 switchport mode trunk

interface vlan 1

 ip address 10.0.0.1 255.255.255.0

interface vlan 2

 ip address 10.2.0.1 255.255.255.0

Depending on the Cisco IOS software release your router is running, the release to which you upgrade, 
and the modules in your router, you may have to reconfigure existing MGF interfaces.

In the following scenario, you do not have to reconfigure existing MGF interfaces:

If your Cisco ISR G2: 

Is running a release earlier than Cisco IOS Release 15.1(3)T and 

Has Cisco EtherSwitch HWICs or Cisco EtherSwitch Network Modules 

and 

You upgrade your Cisco ISR G2 to Cisco IOS Release 15.1(3)T or a later release and

You keep your Cisco EtherSwitch HWICs or Cisco EtherSwitch Network Modules

You do not have to reconfigure your MGF interfaces.