Connecting multiple routers for single switch

[Surabhi]

Hi,

Need help!!!

We are receiving internet service with /27 IPs .From the ISP provider's router we are connecting to a layer 2 switch, from that switch we are connecting different router as per our requirements like sd-wan, WIFI,LAN Etc. We don't have any VLAN configuration at the switch.

Is this right way? 

Please check the diagram for example.

We are seeing bandwidth degradation at our LAN , we are supposed to get 100mbps but we are getting only 9mbps.

I am assuming something is wrong.

[balaji.bandi]

If the Switch acting as Layer 2 yes that is the way to connect (no other things done on the switch)

We are seeing bandwidth degradation at our LAN , we are supposed to get 100mbps but we are getting only 9mbps.

100MB inside the Lan ? from what device to what device are you testing? 

100Mega bits per second?  transfer always Megabytes per second - please check and clarify ?

while you transferring the files or speed test,  on the switch port what do you see show interface fas x/x transfer rates?

[MHM Cisco World]

depend on SW technology, 

this SW only connect L3 device so prefer to be cut-through not store-and-forward