Forum Discussion

Aspirant

Nov 03, 2016

Using M4100-26G-POE For ASE WAN

Hello Netgear Community! My company recently implemented an ASE (AT&T Switched Ethernet) WAN with a rate 250Mb and latency of 51ms. The fiber drop is plugged into the SFP port on the Netgear and ...

Troubleshooting

Retired_Member

Nov 03, 2016

Hi NetGeak88,

Welcome to the community!

Netgear Managed Switch support transmitted bandwidth limit per port or global. Yes, 'traffic-shape' is the correct CLI command. And this function will shape the outbound transmission rate, specifies the maximum bandwidth allowed.

If you want limit transmitted bandwidth in one port, you only need to set 'traffic-shape xxx' in interface config mode, and the 'xxx' is the percent of line rate of the port.

But there is attention, the transmission rate is related with packet length, tipically we caculate the rate with 512 lentgh.

For example:

If packet length is 64Bytes, the line rate is about 761Mbps, so shape bandwidth to 25%, the rate is nearby 190Mbps;

If packet length is 512Bytes, the line rate is about 962Mbps, so shape bandwidth to 25%, the rate is nearby 240Mbps;

If packet length is 1024Bytes, the line rate is about 987Mbps, so shape bandwidth to 25%, the rate is nearby 247Mbps;

BTW, pleare refer to attachment of 'shape rate with packet is 1500Bytes.jpg'.

shape rate with packet is 1500Bytes.jpg

Thanks,

Eric
NETGEAR Employee

NetGeak88

Aspirant

Nov 04, 2016

Hello Eric,

I am not sure I understand. With 'traffic-shape 25' on that interface, AT&T/ASE says we're still hitting their policer and that is most likely causing are poor throughput. Is there a way to set a committed burst size on egress for the port?

Retired_Member
Nov 06, 2016
Hi NetGeak88,

Do you mean to set CR(Committed Rate) and CBR(Committed Burst Size)? If so, maybe the DiffServ feature can comply with your request.

For the detailed information of DiffServ, please refer to User Manual(Page241):

http://www.downloads.netgear.com/files/GDC/M4100/M4100_UM_2apr15.pdf

Thanks,

Eric
NETGEAR Employee
- NetGeak88
  Aspirant
  Nov 07, 2016
  Hello Eric,
  
  That's exactly what I need. I attempted the DiffServ settings but before I can get to the screen you referenced above, I have to create a new Policy and the "Policy Type" field is statically set to "in". So it definitely seems like the M4100 just doesn't support what I need.
  - Retired_Member
    Nov 08, 2016
    Hi NetGeak88,
    
    Yes, for M4100 seriels Switch, it only support DiffServ policy inbound. It means that DUT will apply the policy and shape the traffic on inbound direction.
    
    Thanks,
    
    Eric
    NETGEAR Employee