Cisco Cisco Unity Express for SRE

The Multi Gigabit Fabric (MGF) feature enables one or more modules in a router to communicate with 
each other without involving the router’s CPU. The MGF feature is supported on the following modules:

Cisco SRE Internal Service Module-Services Ready Engine (Cisco SRE ISM)

Cisco SRE Service Module-Services Ready Engine (Cisco SRE SM)

Cisco Enhanced EtherSwitch Service Module (Cisco SM-ES and Cisco SM-ES-D)

This document describes MGF configuration on Cisco Integrated Services Routers Generation 2 
(Cisco ISRs G2) running Cisco IOS Release 15.1(3)T or a later software release. For information about 
MGF configuration on Cisco ISR G2s running an earlier software release, see 

The MGF is a GigabitEthernet switch that connects a number of devices within the router, including the 
modules listed at the beginning of this document, and the CPU. As shown in 

, without MGF, all 

communication between devices within a router involves the CPU.