Hi Amrendra,
i was assumed by question that you required point-to-point link will be connecting to your end from 3 different service providers at a 2 Mbps bandwidth, if that is the case, find the working configuration below.
multilink virtual-template 1
interface Virtual-Template1
ip unnumbered FastEthernet0
ppp multilink
interface Serial0/0
bandwidth 2048
no ip address
encapsulation ppp
ppp multilink
interface Serial0/1
bandwidth 2048
no ip address
encapsulation ppp
ppp multilink
interface Serial1/1
bandwidth 2048
no ip address
encapsulation ppp
ppp multilink
interface FastEthernet0
ip address 192.168.1.1 255.255.255.0
Not necessarily eigrp is required, but if this router is going to advertise to different routers different network, then you need.
router eigrp 4444
network 192.168.1.0
network 10.0.0.0 (optional) for advertising diff network router)
for verifying the bandwidth virtual 6 Mbps, then you need to type "show virtual-access 0" or 1, once if you find that it shows 6 Mbps then your done.
i hope your are clear with this.